NEWTONS LAWS OF MOTION : NEWTONS LAWS OF MOTION NEWTONS LAWS OF MOTION : NEWTONS LAWS OF MOTION LAW OF INERTIA
LAW OF ACCELERATION
LAW OF INTERACTION Law of Inertia : Law of Inertia An object at rest will stay at rest and an object in motion will continue its motion unless an external force acts on it. Slide 4: The law of inertia is most commonly experienced when riding in cars and trucks. In fact, the tendency of moving objects to continue in motion is a common cause of a variety of transportation accidents. Consider for instance the unfortunate collision of a car with a wall.
What would happen if the passengers were not wearing the seat belt? What motion would the passengers undergo if they failed to use their seat belts and the car were brought to a sudden and abrupt halt by a collision with a wall? Slide 5: If the car were to abruptly stop and the seat belts were not being worn, then the passengers in motion would continue in motion. Slide 6: As the motorcycle accelerates, the rider accelerates with it; as the motorcycle decelerates, the rider decelerates with it; and as the motorcycle maintains a constant speed, the driver maintains a constant speed as well.
What would happen if the rider were not wearing the seat belt? What motion would the rider undergo if she/he failed to use a seat belt and the motorcycle were brought to a sudden and abrupt halt by a collision with a wall? Slide 7: If the motorcycle were to abruptly stop, then the rider in motion would continue in motion. Slide 8: Consider for instance a ladder strapped to the top of a painting truck. As the truck moves down the road, the ladder moves with it. Being strapped tightly to the truck, the ladder shares the same state of motion as the truck. As the truck accelerates, the ladder accelerates with it; as the truck decelerates, the ladder decelerates with it; and as the truck maintains a constant speed, the ladder maintains a constant speed as well.
What would happen if the ladder was negligently strapped to the truck in such a way that it was free to slide along the top of the truck? Slide 9: If the truck were to abruptly stop and the straps were no longer functioning, then the ladder in motion would continue in motion. Assuming a negligible amount of friction between the truck and the ladder, the ladder would slide off the top of the truck and be hurled into the air. LAW OF ACCELERATION : LAW OF ACCELERATION A net force acting on a body produces an acceleration; the acceleration is inversely proportional to its mass and directly proportional to the net force and in the same direction. Slide 11: Observe the animation of the three cars. Which car or cars (red, green, and/or blue) are undergoing an acceleration? Study each car individually in order to determine the answer. LAW OF INTERACTION : LAW OF INTERACTION For every action there is an equal and opposite reaction.