Question

I have tried to answer the following questions. Please let me know if I missed one and why.

1) A light car and a heavy car are headed toward each other from opposite directions at the same speed. The ground is level. Which of the two will be harder to stop?

the heavier car

2)

Instead of stopping the cars, you jump out of the way. The two cars crash head-on. After the crash what do you see? The two cars are completely stopped. The two cars move together in the direction the larger car was moving. The two cars move together in the direction the smaller car was moving.

The two cars move together in the direction of the larger car

3) You are standing on a skateboard on a level surface. Someone throws a ball to you along the direction the skateboard is pointing, and you catch it. In what direction do you move after catching the ball?

away from the ball's thrower

4) You are moving on a skateboard at constant speed towards a ball suspended from a very fine thread. When you reach the ball, you grab it and the thread breaks. What happens to your speed?

5)

A moving billiard ball hits a stationary billiard ball directly so that the first ball stops. How do you expect the speed of the second ball to compare with the first?

It is significantly smaller

It is about the same

It is significantly larger

It doesn't move

It is about the same

6) You stand on a skateboard in the road with your board facing east. An 18-wheel truck from the west impacts with you without braking. How is the truck's speed affected by you?

The truck's speed is slightly less

7) Two trains of equal mass on the same track both travel east. Train A is in the lead and is moving quite slow. Train B is behind, but moving very quickly. When Train B catches Train A they stick, what do you think will happen?

They will move faster than train A but slower than B

Answer 1