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WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400...

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WORK AND MACHINES 8 TH GRADE SCIENCE
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Page 1: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

WORK AND MACHINES

8TH GRADE

SCIENCE

Page 2: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

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Page 3: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

Row 1, Col 1

A runner exerts 200N of force over 3 meters and

generates 300 watts of power.How long did it take the runner

to do this?Power = F x D / Time

What is 2 seconds?

Page 4: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

1,2

Name an example of a wedge.

What is ax, zipper, shovel?

Page 5: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

1,3

The force that is used overa distance to move an object is

called__________.

What is a work?

Page 6: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

1,4

A fixed point that a lever pivots around and where it is

supported is called _______.

What is a fulcrum?

Page 7: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

2,1

Name an example of a wheeland axle.

What is a screwdriver, door knob, steering wheel?

Page 8: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

2,2

This is a device that allowsyou to do work easier.

What is a machine?

Page 9: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

2,3

A newton-meter is also called________?

What is Joule?

Page 10: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

2,4

Name 3 factors in which a machine makes work easier and give an example of each.

What is change the amount of force you exert, change the distance over which you exert force, or change the

direction in which you exert the force?

Ramps helps you to exert a smaller force over a longer distance. A bike gear helps you exert a greater force over a shorter distance. A pulley lets you change the

direction.

Page 11: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

3,1

This multiples effort forceover a long distance________.

What is a screw?

Page 12: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

3,2

If you do 2,000J of workand your simple machine does

500J, what is the efficiency of thesimple machine?OW/IW x 100%

What is 25%?

Page 13: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

3,3

On your leg, the fulcrum is at your_______?

What is knee?

Page 14: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

3,4

This uses 2 or more machines.

What is a compound machine?

Page 15: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

4,1

A relatively small unit of power is called ________.

What is a watt?

Page 16: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

4,2

A force of 30 N moves an object a distance of 5 meters. How much

work is done?Work=(force)(distance)

150J

Page 17: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

4,3

You use 5 N to move a 10 N object using a pulley. What

Is the AMA?AMA=Output force/input force

2

Page 18: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

4,4

For work to be done, the direction of the applied force must be in the same or

different direction of the motion?

What is the same?

Page 19: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

5,1

Does friction make a simple machine more or less efficient?

less

Page 20: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

5,2

If a 200 N person goes 5 m in 2 seconds. What is their power?

P= F X D/T

500 W

Page 21: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

5,3

Comparing output work to inputwork as a percent will give you

the ______________of a machine?

What is efficiency?

Page 22: WORK AND MACHINES 8 TH GRADE SCIENCE 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100.

5,4

The ideal machine has the efficiency of what %?

What is 100%.


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