1.You jump out of an airplane and open your parachute after an extended period o

Question

1.You jump out of an airplane and open your parachute after an extended period of free fall.

Part A.To decelerate your fall, must the force exerted on you by the parachute be greater than, less than, or equal to your weight?

greater than

less than

equal to

Part B.Choose the best explanation from among the following:

Choose the best explanation from among the following:

A parachutes can only exert forces that are less than the weight of the skydiver.

The parachute exerts a force exactly equal to the skydiver's weight.

To decelerate a skydiver in free fall, the net force acting on the skydiver must be upward.

greater than

less than

equal to

Explanation / Answer

1. for the deceleration of the body, force should be less than the weight of the body.

if force applied to the parachute is equal to the wight of the body then body moves down with constant velocity.

if force applied to the parachute is greater than the weight of the body then body moves up with some acceleration.

2. after jumping of the plane, skydiver moves with constant speed downward so at this situation wight of the skydiver is equal to the force exerted by parachute.

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