Impulse and Momentum 1) In a car collision, the driver\'s body must change from
ID: 1785634 • Letter: I
Question
Impulse and Momentum
1) In a car collision, the driver's body must change from a high speed to zero. This is true whether or not an airbag is used. Why use an airbag? How does it reduce injuries?
2) You want to close an open door by throwing either a 400g lump of clay or a 400g rubber ball toward it, because walking over and closing it is just too boring. You can throw either object with the same speed, but they are different in that the rubber ball bounces off the door while the clay just sticks to the door. Which projectile will apply the larger impulse to the door and be more likely to close it? Explain either mathematically or with words.
3) For your force versus time graphs, is your peak force significantly different than your average force? Why is this important to note?
4) Is there a way you could deliver the same impulse to your cart using a much smaller force? If not, why? If so, how?
5) Provide a real world example of change in momentum, or impulse, and explain how your example demonstrates impulse.
Explanation / Answer
1) in a collision car decelerates from a high speed to zero in a short time. Because of which impulse force is very in large. The Airbags in car increases the impact time, thereby reducing the amount of force acting on your body when car hits something hard. The airbagas allows your body to slow down on a cushion, so that you hit with less force. The Airbags also push you back once you hit the cushions.
2) rubber ball. According to Newton's third law " to every action there is equal and opposite reaction. The clay ball sticks on the door which means the door is pushed only once at the time of impact and the door only moves a bit whereas the rubber ball bounces off the door which means there are 2 forces that acts on the door, one when the ball hits the door and the other when ball bounces off the door which in turn pushes the door to close. The door not only stops the ball but also exerts force to push the ball back.
3)time averaged force is greater than peak force
4) a large force acting for a short period of time produces same change in linear momentum as a small force acting for a large period of time.