Work Energy and Simple Machines Quiz

What is the formula for potential energy?

• PE = Fd

• PE = mgh

• PE = 1/2mv^2

• PE = kx^2

How does the potential energy of a book on a shelf change as its height increases?

• Remains the same

• Increases

• Becomes negative

• Decreases

What is the formula for kinetic energy when a car is moving on the road?

• mass * velocity^2

• 1/2 * mass * velocity^2

• 1/2 * mass * velocity

• mass * velocity

How does the kinetic energy of a car change as its speed increases?

• Becomes negative

• Decreases

• Increases

• Remains constant

What is mechanical advantage and how is it calculated?

• The force exerted by a machine

• The distance the machine moves

• Ratio of output force to input force

• The speed of the machine

How do pulleys change the direction of the force?

• By redirecting the force applied to the rope or belt.

• By changing the type of force applied

• By decreasing the force applied

• By increasing the force applied

How does using an inclined plane reduce the amount of force needed to lift an object?

• It decreases the distance over which the force is applied

• It increases the distance over which the force is applied

• It has no effect on the amount of force needed

• It increases the weight of the object

What type of simple machine is a seesaw an example of?

• Screw

• Lever

• Pulley

• Wheel and axle

What is the formula for calculating the efficiency of a pulley system?

• total work input / useful work output

• useful work input / total work output

• total work output / useful work input

• (useful work output / total work input) x 100%

How is work defined in the context of physics?

• Product of force and distance

• Sum of force and distance

• Difference of force and distance

• Division of force and distance