Work and Energy Quiz (A)

In which of the following sentences is work used in the scientific sense of the word?

• Holding a heavy box requires a lot of work.

• A scientist works on an experiment in the laboratory.

• Sam and Rachel pushed hard, but they could do no work on the car.

• John learned that shoveling snow is hard work.

In which of the following sentences is work used in the everyday sense of the word?

• Lifting a heavy bucket involves doing work on the bucket.

• The force of friction usually does negative work.

• Sam and Rachel worked hard pushing the car.

• Work is a physical quantity.

A force does work on an object if a component of the force

• is perpendicular to the displacement of the object.

• is parallel to the displacement of the object.

• perpendicular to the displacement of the object moves the object along a path that returns the object to its starting position.

• parallel to the displacement of the object moves the object along a path that returns the object to its starting position.

Work is done when

• the displacement is not zero.

• the displacement is zero.

• the force is zero.

• the force and displacement are perpendicular.

What is the common formula for work?

• W = FΔv

• W = Fd

• W = Fd²

• W = F²d

In which of the following scenarios is work done?

• A weightlifter holds a barbell overhead for 2.5 s.

• A construction worker carries a heavy beam while walking at constant speed along a flat surface.

• A car decelerates while traveling on a flat stretch of road.

• A student holds a spring in a compressed position.

In which of the following scenarios is no net work done?

• A car accelerates down a hill.

• A car travels at constant speed on a flat road.

• A car decelerates on a flat road.

• A car decelerates as it travels up a hill.

Which of the following energy forms is associated with an object in motion?

• potential energy

• elastic potential energy

• nonmechanical energy

• kinetic energy

Which of the following energy forms is not involved in hitting a tennis ball?

• kinetic energy

• chemical potential energy

• gravitational potential energy

• elastic potential energy

Which of the following formulas would be used to directly calculate the kinetic energy of a mass bouncing up and down on a spring?

• KE = 1/2kx^2

• KE = -1/2kx^2

• KE = 1/2mv^2

• KE = -1/2mv^2