1. When a skier skis down a hill, the normal force exerted on the skier by the hill is
(a) Equal to the weight of the skier.
(b) Greater than the weight of the skier.
(c) Less than the weight of the skier.
2. A golf ball is hit with a golf club. While the ball flies through the air, which forces act on the ball? Neglect air resistance.
(a) The force of the golf club acting on the ball.
(b) The force of gravity acting on the ball.
(c) The force of the ball moving forward through the air.
(d) All of the above.
(e) Both (a) and (c).
3. Suppose an object is accelerated by a force of 100 N. Suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. The object
(a) Is brought to rest rapidly.
(b) Decelerates gradually to rest.
(c) Continues at the velocity it had before the second force was applied.
(d) Is brought to rest and then accelerates in the direction of the second force.