Work Power and Machines

Work Power and Machines

Multiple Choice

Is it work?

Mowing the Lawn?

• Yes

• No

Multiple Choice

Is it work?

Weight lifiting

• Yes

• No

Multiple Choice

Is it work?

Carrying a box.

• Yes

• No

Multiple Choice

Is it work?

Swinging a golf club

• Yes

• No

Multiple Choice

Is it work?

Pushing against a locked door

• Yes

• No

Multiple Choice

Ashton pushes a heavy box 5 meters in 8 seconds. TreShawn pushes the same box the same 5 meters in only 5 seconds. Who did more work?

• Ashton because he pushed it for a longer time.

• TreShawn because he did it faster.

• Neither because work does not include time, only force and distance.

The difference between Work and Power

• Work Unit = Joules (J)

• Force Unit = Newtons (N)

• Distance Unit + meters (m)

The difference between Work and Power

• Work Unit = Joules (J)

• Force Unit = Newtons (N)

• Distance Unit + meters (m)

Multiple Choice

Input force is the work done ___ __ ________

• on a machine

• by a machine

Multiple Choice

Output force is the work done ___ __ ________

• on a machine

• by a machine

We will continue tomorrow with Machines!

• You have work and Force practice problems for homework.