momentum

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Slide 1:

Notes: Momentum CW: Acceleration and Momentum H: The Laws of Motion

Momentum:

Momentum 3-16-11

Objectives :

Objectives describe the relationship between mass, velocity, inertia, and momentum relate conservation of momentum to motion in a collision

What makes an object difficult to stop? :

What makes an object difficult to stop?

Calculating Momentum:

Calculating Momentum The momentum of an object is directly related to its mass and its velocity.

Mass:

Mass Mass measures inertia . The mass of an object tells you how much the object resists accelerating.

Velocity:

Velocity Fast objects are also difficult to stop.

Momentum = (mass)(velocity):

Momentum = (mass)(velocity) p = mv

Example:

Example A ball of mass 2 kg is moving with a speed of 4 m/s. What is its momentum?

Solution:

Solution Momentum = (mass)(velocity) p = mv

Slide 14:

p = (2 kg)(4 m/s) p = 8 kg m/s

Example:

Example A runner has a mass of 75 kg and is running at 6 m/s. What is his momentum?

Solution:

Solution Momentum = (mass)(velocity) p = mv

Slide 17:

p = (75 kg)(6 m/s) p= 450 kg m/s

Slide 18:

Momentum is a vector quantity. Its direction is the same as the direction of the object's velocity.

Knowing the momentum of moving objects helps explain what happens when objects collide with one another.:

Knowing the momentum of moving objects helps explain what happens when objects collide with one another.

Elastic collision:

Elastic collision Resulting momentum

Two dimensional collision:

Two dimensional collision

Slide 22:

Although moving objects can collide in many different ways, they have one important thing in common .

Law of Conservation of Momentum :

Law of Conservation of Momentum The total momentum before the collision is the same after the collision.

Slide 24:

collisions