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# THIS - PowerPoint PPT Presentation

THIS. IS. Jeopardy. Jeopardy. CRCT Review. Efficient Machines. Simple Solutions. Work. Machines. Levers. 100. 100. 100. 100. 100. 100. 200. 200. 200. 200. 200. 200. 300. 300. 300. 300. 300. 300. 400. 400. 400. 400. 400. 400. 500. 500. 500. 500. 500. 500.

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Presentation Transcript

### THIS

IS

Jeopardy

Jeopardy

CRCT

Review

Efficient Machines

Simple Solutions

Work

Machines

Levers

100

100

100

100

100

100

200

200

200

200

200

200

300

300

300

300

300

300

400

400

400

400

400

400

500

500

500

500

500

500

A force must be applied

• An object must move in the same direction as the force

A 100

What unit is used to measure force?

• What unit is used to measure work?

A 200

Newtons (N)

• Joules (J)

A 200

Work = force x distance

(W = f x d)

A 300

Why/why not?

A 400

You pick your cell phone up off the counter and talk into it as you walk across the room. When you finish talking, you place it back on the counter and slide it away from the edge.

When are you doing work on the cell phone?

A 500

Picking up the cell phone

• Placing it down on the counter
• Pushing it away from the edge

A 500

200 J

B 100

You move a wheelbarrow

50 m by exerting 100 N.

B 200

5,000 J

B 200

25

B 300

B 500

Effort

C 100

OL-What is the ideal mechanical efficiency of a machine?

AD- How do you calculate the mechanical efficiency of a machine?

C 200

OL- 100%

input force

x 100%

C 200

Output force

Input force

C 300

Multiply distance

• Multiply force
• Change direction

C 400

A wedge

D 100

A screw

D 200

• Muscles and bones
• Teeth

D 400

Levers

• Wedges

D 400

F 100

Mass

F 200

Family

F 300

The Final Jeopardy Category is:

Types of Machines

Click on screen to begin

OL- Explain why wedges and screws are actually types of inclined planes.