Understanding Power, Force, and Velocity

What is the definition of power in terms of work?

• Power is the total work done.

• Power is the rate at which work is done.

• Power is the energy stored in an object.

• Power is the force applied over a distance.

How can power be expressed when force and velocity are in the same direction?

• Power equals force divided by velocity.

• Power equals force times velocity.

• Power equals force minus velocity.

• Power equals force plus velocity.

In the example of moving a box, what is the power output if a force of 20 Newtons is applied at a velocity of 2 meters per second?

• 40 watts

• 4 watts

• 20 watts

• 10 watts

What is the applied force if a 30 watt motor lifts a crate at 0.5 meters per second?

• 30 Newtons

• 90 Newtons

• 15 Newtons

• 60 Newtons

When lifting a crate with a motor, what must be true about the forces if the crate moves at a constant velocity?

• The applied force is greater than the gravitational force.

• The applied force is less than the gravitational force.

• The applied force is unrelated to the gravitational force.

• The applied force equals the gravitational force.