Quiz on Work, Energy, and Power

What is the S.I. unit of work?

• Watt

• Pascal

• Newton

• Joule

What does the dot product of force and displacement represent?

• Force

• Power

• Work

• Energy

When is the work done on an object zero?

• When force is zero

• When displacement is zero

• When angle is 90 degrees

• All of the above

What is the formula for gravitational potential energy?

• U = 1/2 kx^2

• U = mgh

• U = 1/2 mv^2

• U = Fd

What is the principle of conservation of energy?

• Energy is always lost

• Total energy remains constant

• Energy can be created

• Energy can be destroyed

What is the work-energy theorem?

• W = 1/2 kx^2

• W = mgh

• W = ΔK

• W = Fd

What is the average power formula?

• P = W/t

• P = Fd

• P = mgh

• P = 1/2 mv^2

What is the formula for kinetic energy?

• K = 1/2 mv^2

• K = mgh

• K = 1/2 kx^2

• K = Fd

What happens to the total mechanical energy in an isolated system?

• It increases

• It fluctuates

• It decreases

• It remains constant

What is the work done by a constant force?

• W = Fd sin θ

• W = Fd cos θ

• W = F + d

• W = Fd