Energy & Work Done

What is the formula of the ability to do work? (1pt)

• Mass * Gravity * Height

• 1/2 * Mass * (Velocity)^2

• kg m^2/s^2

• Force * Distance Moved

What is a sign of work being done? (1pt)

• If there is no distance but force applied to an object while standing still.

• If a force that acts on an object and the object moving the same direction of the force.

• If there is distance being moved but no force applied to an object on the same direction.

• None of the above.

Which of these are one of the examples of work being done? (1pt)

• Bouncing a basketball and running straight.

• Holding school books standing still.

• Walking

• Carrying a ball at chest level.

Which of the following is a definition of energy? (1pt)

• Force applied perpendicular to the surface.

• Ability to do work.

• Force causes displacement.

• Something that has mass and occupy space.

Which of the following is not true about work done? (1pt)

• A force given on an object that causes displacement.

• Unit of work is Joule.

• Displacement of the object should be the same as the direction of the force.

• This make the object stop moving.

Is there work being done on this statement? (2pts)

"A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed."

• No, because there's no force given on the tray.

• Yes, because there's force given on the tray.

• No, because there's no displacement of the tray in the same direction as the apply force.

• Yes, because there's force given on the tray and the waiter move.

What is the unit of gravitational acceleration? (1pt)

• N/m

• s/m

• N/kg

• m/s

What is the unit for kinetic energy? (1pt)

• kg m^2/s^2

• Mass * Gravity

• Mass * Gravity * Height

• 1/2 * Mass * (Velocity)^2

What is the unit for potential energy? (1pt)

• kg m^2/s^2

• Mass * Gravity

• Mass * Gravity * Height

• 1/2 * Mass * (Velocity)^2

What are the SI Units of Mass, Gravity, and Height? (1pt)

• kg, m/s, and km

• kg, m/s^2, and m

• kg, N/m, and m

• g, m/s, and m