Module Test: Energy and Its Conservation

The total amount of energy of an isolated, closed system remains:

• Constant

• Increasing

• Decreasing

• Unpredictable

Which of the following statements about gravitational potential energy is true?

• It increases as an object falls toward Earth.

• It decreases as an object falls toward Earth.

• It remains constant for all objects.

• It is equal to kinetic energy at all points.

If a tabletop is used as a reference point in a mechanical-energy problem, the gravitational potential energy for an object on the floor is:

• Less than zero

• Equal to zero

• Greater than zero

• Cannot be determined

What happens to the kinetic energy of an object if its velocity is doubled?

• It remains the same

• It increases by a factor of 2

• It increases by a factor of 4

• It decreases by a factor of 2

An object has kinetic energy because of its:

• Position

• Motion and mass

• Temperature

• Shape

Which of the following objects has the greatest gravitational potential energy?

• A 1-kg book on a 2-meter shelf

• A 2-kg book on a 1-meter shelf

• A 3-kg book on a 0.5-meter shelf

• A 4-kg book on a 0.25-meter shelf

Work is done on an object when a force is exerted and the object is displaced:

• In a circle

• Perpendicular to the force

• In the direction of the force

• Opposite the direction of the force

When a constant force acts at an angle to the direction of motion, which equation is used to calculate work?

Which of the following items relates to power but not work?

• Distance

• Time

• Mass

• Force

The pedals of a bicycle act as a:

• Lever

• Wheel and axle

• Wedge

• Pulley