Work and Simple Machines

Presentation

•

Physics

•

8th - 9th Grade

•

Hard

Joseph Anderson

FREE Resource

21 Slides • 14 Questions

Simple Machines

by William Lovering

Simple Machines

How machines can and cannot make work easier

Machines can...

increase input force (but must decrease input distance)
increase input distance (but must decrease input force)
change the direction of force

Machines cannot...

Make you do less work
Make you use less energy

Multiple Choice

Simple Machines help you do less work

True

False

Multiple Choice

Simple machines can reduce the amount of force you need to do work.

True

False

Multiple Choice

You can lift a 50 newton rock 2 meters with a force of 50 newton. How much work is this?

50 j

100 j

25 j

Multiple Choice

If I build a simple machine that will let me lift that 50 n rock 2 m, but I will only need to use 10 n of force, how much work would I need to do to the machine to lift the rock?

20 j

100 j

50 j

25 j

Multiple Choice

How much distance would I have to put in the machine to lift a 50 n rock 2 m if I put 10 n of force into the machine?

10 m

5 m

25 m

2 m

Multiple Choice

If a machine increases your force, it must decrease your distance.

True

False

Fill in the Blanks

There are

Type answer...

classes or types of levers.

Multiple Choice

Which of the following is NOT part of a lever?

Effort Arm

Base

Fulcrum

Multiple Choice

3. Which type of lever is this?

First Class Lever

Second Class Lever

Third Class Lever

Multiple Choice

6. What kind of lever is this?

First Class Lever

Second Class Lever

Third Class Lever

Multiple Choice

A wheelbarrow is an example of a:

1st class lever

2nd class lever

3rd class lever

Multiple Choice

1st Class

2nd Class

3rd Class

It is not a lever

Multiple Choice

The nutcracker is the example of .......................

First Class of lever

Second Class of lever

Third Class of lever

Fourth Class of lever

Multiple Choice

What is definition of the effort?

The fixed point or pivot

The point where the force is applied

The point where the weight/resistance is coming from

Simple Machines

by William Lovering

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