Work-Energy Theorem (H)

45 J of work were done on the object that moved 5 meters. How much force was applied to the object?

• 8 N

• 225 N

• 9 N

• 0 N

A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What is the amount of work needed to accelerate the box?

• 50 J

• 60 J

• 20 J

• 45 J

Calculate the force necessary to move a 1000 kg car from rest to 25 m/s in 130 m.

• 1.274 x 10⁶ N

• 25,0000 N

• 2403.85 N

• 3.25 x 10⁶ N

What are the units for Work?

• Newtons

• Kilograms

• Joules

• Moles

What is the equation for Kinetic Energy (KE)?

• $KE\ =\ 2mv^2$

• $KE\ =\ 2mv$

• $KE\ =\ mv^2$

• 
  

  $KE\ =\ \frac{1}{2}mv^2$

For an object sliding on the ground, the friction force

• always acts in the same direction as the displacement

• always acts in a direction perpendicular to the displacement

• always acts in a direction opposite to the displacement.

• acts either in the same direction as the displacement or in the

  direction opposite to the displacement depending on the value of the coefficient of kinetic friction.

Which of the following statements are true about potential energy?

• Both gravitational and elastic potential energy are dependent upon the speed of an object.

• Moving objects cannot have potential energy.

• None of these

• Potential energy is the energy stored in an object due to its position.

The product of the net force on an object and the distance through which the object is moved

• joule

• work

• power

• energy

Which Equation matches:

"An object slides down a frictionless ramp."

• GPE = KE

• W = GPE + KE

• GPE −W = KE

• W = GPE

Which Equation matches:

"An object is lifted up."

• GPE = KE

• W = GPE + KE

• GPE − W = KE

• W = GPE