Lecture 15 Quiz PHYS2001

Which would be more damaging; driving into a massive concrete wall or driving at the same speed into a head-on collision with an identical car traveling toward you at the same speed?

• Driving into the wall.

• Head-on collision.

• The damage would be the same in either case.

Suppose you are on a cart, initially at rest on a track with no friction. You throw balls at a partition that is rigidly mounted to the cart. If the balls bounce straight back as shown in the figure, will the cart be put into motion?

• Yes. The cart will move to the left.

• Yes. The cart will move to the right.

• No. The cart will not move.

A satellite explodes in outer space, far from any other body, sending thousands of pieces in all directions. Is the linear momentum of the satellite before the explosion less than, greater than, or equal to the total linear momentum of all the pieces after the explosion?

• Less

• Greater

• Equal