Physics - Chapter 9 Energy

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

• work
• energy
• power
• lever

If you lift an object twice as high you do _____ the work.

• half
• four times
• two times
• the same amount of

the formula for work

• W=F/d
• W=Fd

units for work

• There is a transfer of energy.
• W=Fd
• 1. against another force. 2. changing the speed of an object.
• joules (newton-meters) (same as for energy)

How do you know work is done?

• 1. against another force. 2. changing the speed of an object.
• You work against gravity.
• joules (newton-meters) (same as for energy)
• There is a transfer of energy.

What are the two categories of work?

• You work against gravity.
• There is a transfer of energy.
• 1. against another force. 2. changing the speed of an object.
• When a force acts on an object and the object moves in the direction of the force.

What happens when you lift something?

• 1. against another force. 2. changing the speed of an object.
• You work against gravity.
• When a force acts on an object and the object moves in the direction of the force.
• newton; meter

When is work done on an object?

• power
• newton; meter
• You work against gravity.
• When a force acts on an object and the object moves in the direction of the force.

One joule of work is done when a force of one ___ is exerted over a distance of one _____.

• Power equals the amount of work done divided by the time interval during which the work is done.
• power
• newton; meter
• When a force acts on an object and the object moves in the direction of the force.

the rate at which work is done

• newton; meter
• power
• Power equals the amount of work done divided by the time interval during which the work is done.
• P = W/t