Simple Machines

• Science

How do simple machines give a mechanical advantage? 

Cette vidéo n'est plus disponible

What is Work? 

Which of the following does NOT describe work?

1. force applied to an object and it moves
2. transfers energy from one object to another
3. force applied to an object but it does not move
4. an object moving in the direction of the force

The unit used to measure work is

1. Newtons
2. Force
3. grams
4. Joules

Another word used for distance is

1. meter
2. displacement
3. work
4. force

How to Calculate Work?

Work = Force x Distance

  Example #1: 

You move a 75 kg refrigerator 35 m. This requires a force of 90 N. 

How much work, in joules, was done while moving the refrigerator?

m = 75 kg

d = 35 m

F = 90 N

W = ?

  Example #1:        ANSWER

You move a 75 kg refrigerator 35 m. This requires a force of 90 N. 

How much work, in joules, was done while moving the refrigerator?

m = 75 kg

d = 35 m

F = 90 N

W = ?

W = (90)(35)

W = 3,150 J

Notes & Practice Sheet

      Complete ALL the practice 

          problems on the first page

       AND #1 - 4 on the back of the

                       first page. 

        

          Have one partner bring 

         the paper to be checked. 

Make corrections and bring back to me. 

1.

2 .

3.

What are Simple Machines? 

1. Watch the video. 

2.  Read the Simple Machine Notes on the back of the first page. 

Read the notes about Mechanical Advantage on the last page. 

Mechanical advantage is the ratio of ____ to the ____ force.

1. input , output
2. output, input

Mechanical advantage is how many times the machine multiplies the ____ you are putting in.

1. force
2. distance
3. mass
4. time

If the mechanical advantage is less than , then work is _____.

1. slower and harder
2. harder, but slow
3. the same strength and time
4. harder, but faster

If mechanical advantage is ____, then work is slower, but easier.

1. less than 1
2. equal to one
3. greater than 1

Notes & Practice Sheet

      Complete the practice on 

        the last page. #1-5

      Have one partner bring 

     the paper to be checked. 

Make corrections and bring back to me. 

1.

2.

3.

01:36

Simple machines don't reduce the ____ to move an object only the _____.

1. energy, force
2. force, work
3. force, energy
4. force, effort

02:17

Simple machines decrease the amount of work being done.

1. True
2. False

02:17

When using a machine, the input force is

1. the force you apply to the machine.
2. the force from the machine.

02:17

When using a machine, the output force is the force

1. you apply to the machine.
2. the machine applies.
4. .