Question

Ch7 Questions Momentum

1. What is the relationship between velocity and momentum? Give an example
2.
Which has a greater mass, a heavy truck at rest or a rolling skateboard?
3.
Which has greater momentum?
3. Distinguish between impact force and impulse.
4. When the force of impact on an object is extended in time, does the impulse increase or decrease?
5. Distinguish between impulse and momentum.
6. If the time of impact in a collision is extended by four times, how much does the force of impact change
7. What does it mean to say momentum is conserved?
8. Distinguish between elastic and inelastic collisions.
9. In terms of impulse and momentum why are air bags in automobiles a good idea?
OBRABIA
10. You can't throw a raw egg into a wall without breaking it, but you throw it at the same speed at sagging sheet without breaking it.
Explain.

Answer 1

Answer:1. Momentum is directly proportional to velocity. If an object has a higher velocity, it will have a greater momentum. For example, a truck moving at a high speed has a greater momentum than a skateboard moving at a slow speed.

2. The heavy truck at rest has a greater mass than the rolling skateboard.

3. The object with the greater velocity will have greater momentum. For example, a car traveling at 60 mph has greater momentum than a bicycle traveling at 10 mph.

4. When the force of impact is extended in time, the impulse increases.

5. Momentum is the product of mass and velocity, while impulse is the change in momentum over time.

6. If the time of impact in a collision is extended by four times, the force of impact decreases by four times.

7. Conservation of momentum means that in a closed system, the total momentum before a collision is equal to the total momentum after the collision.

8. In elastic collisions, both momentum and kinetic energy are conserved, while in inelastic collisions, only momentum is conserved.

9. Air bags in automobiles are a good idea because they increase the time over which the force of impact is applied to the occupant, reducing the impulse and therefore reducing the risk of injury.

10. The sagging sheet is able to absorb the egg's impact force over a longer period of time than the wall, which causes the egg to break upon impact with the wall. The longer time of impact reduces the impulse, making it less likely for the egg to break.

Step-by-step explanation: