You set up a race between two objects, releasing them from rest at the top of a ramp. The first object is a block with a very slippery surface - it slides down the ramp with negligible friction. The second object is a sphere that rolls without slipping down the ramp (note that such rolling is described in the book on page 249). Which object reaches the bottom of the ramp first?

1. The block.
2. The sphere.
3. Both objects reach the bottom at the same time.
4. Not enough information is given - it depends on which object is heavier.

When a wheel rolls without slipping, what is the velocity of a point on the edge of the wheel at the point the wheel makes contact with the surface it's rolling on?

1. The instantaneous velocity is zero
2. It's in the direction the wheel is traveling
3. It's in the direction opposite to the way the wheel is traveling
4. None of the above