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IS

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Work Efficient Machines

Machines Simple Solutions

LeversCRCT

Review

What must occur every time for work to be exerted?

A 100

1. A force must be applied

2. 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

What is the formula for work?

A 300

Work = force x distance

(W = f x d)

A 300

If you lift your science book up off the floor, are you doing

work?

Why/why not?

A 400

Yes, because you are lifting your books upward, and the books are moving upward

also.

A 400

A 500

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?

1. Picking up the cell phone

2. Placing it down on the counter

3. Pushing it away from the edge

A 500

You exert 20 N to push a desk 10 m.

B 100

200 J

B 100

You move a wheelbarrow

50 m by exerting 100 N.

B 200

5,000 J

B 200

What is the MA of a machine that has an output of 250 J if

you have an input of 10 J.

B 300

25

B 300

You push a car 0 m with 200 N

B 400

B 400

No work is being done because the car didn’t move

You carry your cat 50 m with 100 N

B 500

No work is being done, you are holding the cat up and moving it

forward

B 500

What is a term that means the same thing as input force?

C 100

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%

AD- output force

input force

C 200

x 100%

How do you find the MA of a machine?

C 300

Output force

Input force

C 300

C 400

What are the 3 ways a machine can help you do work?

1. Multiply distance

2. Multiply force

3. Change direction

C 400

C 500

What is the MA of a machine that multiplies force?

Greater than 1

An inclined plane that moves is called?

D 100

A wedge

D 100

An inclined plane wrapped around a cylinder is called?

D 200

A screw

D 200

A machine that uses 2 or more simple machines is

called?

D 300

A compound (or complex) machine

D 300

Which type of simple machines best represent

these parts of your body?

1. Muscles and bones

2. Teeth

D 400

1. Levers

2. Wedges

D 400

Why would you increase the length and thinness of a

wedge?

D 500

To create a greater MA

D 500

The fixed point a lever pivots around is called?

E 100

The fulcrum

E 100

The weight the lever lifts is called?

E 200

The resistance

E 200

What is always located in the middle of a 2nd class levers?

E 300

The resistance

E 300

What class of lever does a bottle opener belong to?

E 400

2nd class

E 400

What class of lever do pliers belong to?

E 500

1st class

E 500

From an element’s location on the periodic table, what

can you predict?

F 100

An element’s properties

F 100

What is used to measure how much matter an object

contains?

F 200

Mass

F 200

When elements are in the same column on the periodic table,

they are in the same _________.

F 300

Family

F 300

How are atoms and elements related?

F 400

Every element has it’s own specific type of atom.

F 400

In order for a skater to not be accelerating, what would they

need to be doing?

F 500

Skating in a straight line at a constant speed.

F 500

The Final Jeopardy Category is:

Types of Machines

Please record your wager.

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OL- Explain why wedges and screws are actually types of inclined planes.AD- •If constructing a lever with the highest MA possible, where should the effort, resistance, and fulcrum be located?•Using the picture below, which machines multiply the input force?

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