Work, GPE & KE

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

What is the equation for Kinetic Energy (KE)?

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

What is kinetic energy?

• stored energy
• energy of motion
• energy of friction
• energy stored in chemical bonds

When a roller coaster cart falls towards the ground, what happens to its potential energy?

• Increases
• Decreases
• Stays the same
• Nothing

What is the kinetic energy of a ball sitting on top of a hill?

• 0 J
• less than 0 J
• more than 0 J

When a rollercoaster cart moves towards the ground, what happens to the PE that it has?

• It transforms into KE
• It leaves the system
• Nothing
• It stays PE

Based on the formula for potential energy, what 2 variables influence PE the most?

• mass and height
• mass and velocity
• velocity and height
• velocity and mass