Force_Motion power point

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Force & Motion

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Energy, Force, and Motion identifying energy transformations; Identifying and analyzing the transfer of heat energy by conduction, convection, and radiation interpreting a phase diagram; describing and calculating velocity and acceleration; comparing Newton’s three laws; calculating mechanical advantage; understanding the work of simple machines Waves, Electricity, and Magnetism investigating light and sound phenomena and comparing light to sound; Doppler effect ; describing the causes of static electricity ; constructing and analyzing series and parallel circuits; describing the relationship between voltage, current and resistance and relating electricity and magnetism and common applications

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SPEED Describes how fast an object is moving.

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Average Speed Average Speed = distance time

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Velocity The speed of an object in a certain direction .

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Velocity V = velocity (meters/second) d = distance (meters) t = time (seconds) d V = t speed of an object in a certain direction.

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Velocity speed of an object in a certain direction. seconds 0 2 1 3

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Speed=? Velocity=? 16 meters 12 meters 20 meters Total time= 4 seconds A B

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Numerator Denominator 5 12

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Acceleration

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Acceleration is how quickly velocity changes over time. X L eh ray shun Speed 0 2 1 3 Meters/second

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Acceleration how quickly velocity changes over time. A = (V final - V initial ) time ___________

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Acceleration the change in velocity over time. Acceleration = change in velocity time (v 2 – v 1 ) Acceleration = Time ________ V 1 = beginning velocity V 2 = ending velocity

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The graph below relates speed and time of four cars (1, 2, 3, and 4) traveling along a straight highway. Which two cars move with zero acceleration? 1 and 4 2 and 3 1 and 2 3 and 4

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Which of the following is certain to change as a ball accelerates? mass of the ball inertia of the ball velocity of the ball force acting on the ball

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What must happen to an object in order to accelerate it? A net force must be applied. Some weight must be removed. Its frictional coefficient must be reduced. It must contain momentum.

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Which of these describes the object with the largest acceleration ? An object with a small change in velocity over a small change in time An object with a small change in velocity over a large change in time An object with a large change in velocity over a small change in time An object with a large change in velocity over a large change in time

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Scalar a measurement that does NOT contain direction . Egg sample: Speed Vector a measurement that contains direction . Egg sample: Velocity

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Forces of Nature Gravitational Magnetic

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Mass and Inertia The universe consists of matter in motion

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The greater the mass the harder it is to move. And . . . the harder it is to stop moving.

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Lower mass objects are easier to move . . .and to stop moving.

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NEWTON’s Laws 1st Law of Motion : An object remains at a in a ,until a net force acts on it. constant speed straight path

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Inertia ih ner shah An object will remain at a constant speed (unless disturbed). NEWTON’s 1st Law of Motion is the law of

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momentum the mass times velocity of an object p = m • v Momentum = mass x velocity (Kgrams) (meters/second) the force of a moving body. ___________

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momentum Higher mass higher momentum Higher velocity higher momentum Momentum = mass x velocity p = m • v

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momentum includes velocity. So, it has direction. Momentum points in the direction of motion.

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Conservation of momentum When objects collide, all of the momentum goes somewhere.

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Conservation of momentum When objects collide, all of the momentum goes somewhere.

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Conservation of momentum When objects collide, all of the momentum goes somewhere.

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Conservation of momentum When objects collide, all of the momentum goes somewhere.

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NEWTON’s 2 nd Law of Motion : An object that has a force acting on it will change its speed (accelerate).

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NEWTON’s 2 nd Law of Motion : f = m•a f = net force (newtons) m = mass (Kilograms) a = acceleration (meters/second 2 ) force = mass • acceleration

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NEWTON’s 2 nd Law of Motion : f = m • a acceleration of the club force of the club mass of the club

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Net force is the total amount of Force (minus the forces that cancel each other out). Force of gravity Force of muscles Net force

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Balanced Forces Unbalanced Forces When the net force is Zero. -> NO movement When the net force is NOT Zero. -> movement

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2 Kg ? Static Equilibrium Balanced forces When all forces are balanced. The net force is Zero. There is NO movement. 3 Kg

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50 N 100 N 100 N 50 N 50 N 50 N

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NEWTON’s 3rd Law of Motion: For every action there is an equal and opposite reaction. Conservation of energy

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NEWTON’s 3rd Law of Motion: For every action, there is an equal and opposite reaction.

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NEWTON’s 3rd Law of Motion: For every action, there is an equal and opposite reaction.

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Balanced or unbalanced? Action Reaction Gravity Inertia Friction

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Gravity balanced UN Time (mSec) Speed (m/s) BALL Ground

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Inertia balanced UN Time (mSec) Speed (m/s) BALL PUTTER

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Friction balanced UN Time (Sec) Speed (m/s) SKATE

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A car is traveling down a hill. Which of the following will affect the amount of energy the car has? how long the car is the time of day how much the car weighs the color of the car

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Friction the resistive force that occurs when two surfaces travel past each other. causes physical deformation generates heat

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Friction the resistive force that occurs when two surfaces contact each other.

Oliver the dog doesn't want to walk in the rain. He can make his owner pull harder on the leash to get him out the door by sitting on the vinyl floor. sitting on the tile floor. sitting on the carpeted floor. sitting on the wood floor. : 

Oliver the dog doesn't want to walk in the rain. He can make his owner pull harder on the leash to get him out the door by sitting on the vinyl floor. sitting on the tile floor. sitting on the carpeted floor. sitting on the wood floor.

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Pauline needs to measure the sliding friction of a brick. How should she go about doing this? attach the brick to a string and then to a spring scale and read the force needed to quickly lift the brick off the ground drag the brick by a string attached to a spring scale so that it gradually speeds up drag the brick by a string attached to a spring scale along the surface of a table at a constant speed and read the force hang the brick from a string attached to a spring scale and read the force

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Sliding friction -the drag force created when the surface of one object slides across the surface of another object. Sliding Friction Lab Object Surface force (Newstons)

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terminal velocity gravity will accelerate an object until air resistance (friction) does not allow it to go any faster. gravity air resistance

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In the absence of air resistance, which of these objects will fall at the fastest rate when dropped? the ball with a mass of 75 kg the ball with a mass of 25 kg the ball with a mass of 10 kg They all fall at the same rate.

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Pressure is the amount of force exerted over a certain area. Pressure = Force Area

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Pressure = Force (newtons) Area (m 2 ) 1 Pascal = 1 Newton/meter 2

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Work

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Work W = f • d { Distance Force { Distance

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Gravitational force Gravity

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Gravitational force Gravity

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Gravitational force INCREASES with Mass DECREASES with Distance

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All objects in the universe are attracted to each other by the force of effort. friction. gravity. inertia.

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Four pairs of objects have the masses shown below. If the objects in each pair are the same distance apart, the gravitational force between the objects in which pair is greatest? 1 kilogram and 1 kilogram 1 kilogram and 2 kilograms 2 kilograms and 1 kilogram 2 kilograms and 2 kilograms

As an astronaut travels from Earth to a space station orbiting Earth, what happens to her mass and weight? Her mass decreases, but her weight remains the same. Her mass increases as her weight decreases. Her mass remains the same, but her weight decreases. Her mass decreases and her weight also decreases. : 

As an astronaut travels from Earth to a space station orbiting Earth, what happens to her mass and weight? Her mass decreases, but her weight remains the same. Her mass increases as her weight decreases. Her mass remains the same, but her weight decreases. Her mass decreases and her weight also decreases.

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Which hill would you slide down the fastest? hill A hill B hill C It would take the same time to slide down all of the hills.

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Projectile Motion seconds 0 2 1 3 Velocity (m/s) forward downward 0 50 9.8 19.6 29.4 39.2

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Projectile Motion seconds 0 2 1 3 Velocity (m/s) forward downward 0 50 9.8 19.6 29.4 39.2 49 48 47 46

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Simple Machines and work Lever Inclined plane Pulley Wedge Screw Wheel and axle

Simple Machines: 

Simple Machines Pulley Wheel & Axle Lever Inclined plane Screw Wedge Gear

Simple Machines: 

Simple Machines Pulley Wheel & Axle Lever Inclined plane Screw Wedge Gear

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Which activity involves the use of a simple machine? riding on a seesaw flying a kite listening to a radio skiing down a hill

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Wheel/Axle Pulley Wheel & Axle Lever

Simple Machine: 

Simple Machine A mechanism that lowers the amount of force needed to do work, by increasing the distance.

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On which simple machine is a fulcrum found? pulley wheel axle lever

ALL Simple Machines work the same way: 

Work = Force Distance x ALL Simple Machines work the same way

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1 meter 2 meters Lever action Force=13 N Force= ?

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3 meters 9 meters Mechanical Advantage = final distance starting distance

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2 meters 8 meters Mechanical Advantage = distance distance

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Which of the following is often used as a lever? file nail saw crowbar

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The Wedge

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The bottom of this light bulb is an example of what type of simple machine? a lever a pulley a screw a wedge

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What type of simple machine is used to split things apart? screw wheel and axle wedge inclined plane

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What type of simple machine is used to pull a flag up to the top of a flagpole? screw wheel and axle inclined plane pulley

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Pulley Lab A fixed pulley B movable pulley C double pulley (end in top) D double pulley (end in bottom)

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fixed pulley B. movable pulley C. double pulley (end in top) D. double pulley (end in bottom) Pulley Lab Get out your own sheet of paper 1. Write down the force of the weight (newtons). 2. For each pulley system write down the NEW force of the weight. Pull the string exactly 20 cm. Write down the distance (cm) that the weight moved. Calculate the mechanical advantage. Force of the weight ONLY. Hook on Bottom dude ! DO THIS FIRST!

BIG Teeth=16 small Teeth =8 16:8 2:1 : 

BIG Teeth=16 small Teeth =8 16:8 2:1 So, the small gear spins TWICE AS FAST as the big gear. Gear Ratio

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calculating mechanical Advantage A 200 pound man lifts a rock weighing 800 pounds by standing on the end of a lever. How much mechanical advantage did the lever provide ? M.A. = 800 Kg/200 Kg = 4

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If you wuz ‘n a Merry-go-round & yuz let go, Which wayz wud yu go?

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Centripetal force The inward force on a spinning object, that stops it from going in a straight line. Perpendicular

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Centripetal force

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Centripetal force sen trip it ul The inward force on a Spinning object.

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Centripetal force The inward force on a Spinning object.

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Satellites stay in place as they orbit because of . . . the repeated firing of rocket boosters. the gravitational pull of Earth. a narrow path through the vacuum of space. solar panels generating energy to hold them in place

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The End Produced by Jake Israel Directed by Jake Israel Original Story by Jake Israel Screenplay Jake Israel Engineer Jake Israel Photo enhancement Jake Israel Casting Jake Israel Editor Jake Israel Custom animation Jake Israel Location manager Jake Israel Special Effects Jake Israel Field research Jake Israel © 2009 All rights reserved. Panther Productions

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