unit 2 module I

Which of the following is an example of the conversion of kinetic energy into gravitational potential energy?

• a person parachuting out of an airplane

• a car racing around an oval track

• a person skiing down a hill

• a person walking up a hill

Which is an example of a wedge?

• knife

• hammer

• ramp

• screw

A ramp is an example of which type of simple machine?

• a lever

• a wheel and axle

• an inclined plane

• a block and tackle pulley

• Position 1

• Position 2

• Position 3

• Mechanical energy does not change.

• In all four positions, mechanical energy is O J.

• The elastic potential energy of the spring at Position 2 is converted to kinetic

  energy.

• The chemical potential energy of the spring is greatest at Position 4.

• In all four positions, the gravitational potential energy of the spring is the same.

• The input force is between the output force and the fulcrum.

• The fulcrum is between the input force and the output force.

• The output force is between the input force and the fulcrum.

• The input force and output force move in opposite directions.

• The motorcycle has the most kinetic energy because it is the vehicle with the least mass.

• All the vehicles have the same kinetic energy because they are moving at the same speed.

• The delivery truck has the greatest kinetic energy because its mass is greater than that of the other vehicles.

• The delivery truck has the greatest kinetic energy because it has the most tires in contact with the pavement.

A faucet is an example of a simple machine, a wheel and axle. The faucet wheel has a radius of 5 cm. The axle has a radius of 0.5 cm. The input force is applied to the faucet wheel. What is the mechanical advantage of this simple machine?

• 0.1

• 1

• 5

• 10