Simple machines

Question 0

A force applied to the end of a lever to lift a load is called a

Answer 0

Effort force

Question 1

A support on which a lever rests while moving or lifting an object is called a

Answer 1

Fulcrum

Question 2

The force of an object on a lever is called a

Answer 2

Load

Question 3

An inclined plane that is wrapped in a spiral

Answer 3

Screw

Question 4

Made of one or more bars resting on a support

Answer 4

Lever

Question 5

A slanted surface

Answer 5

Inclined plane

Question 6

A grooved wheel with a rope or chain around it

Answer 6

Pulley

Question 7

Made of one or two inclined planes

Answer 7

Wedge

Question 8

Do simple machines reduce the amount of work? Explain using an example

Answer 8

Yes. If you have a box and you need to lift it a tall height you can get an inclined plane so you can just push the box up the inclined plane instead of lifting the box over a tall height

Question 9

What type of simple machine is a doorknob?

Answer 9

Wheel and axle

Question 10

A screwdriver is a wheel and axle. What part of a screwdriver is the wheel?

Answer 10

The handle

Question 11

What part of a screwdriver is the axle?

Answer 11

The end part

Question 12

Why is the crank on a meat grinder larger than the crank on a pencil sharpener?

Answer 12

It’s bigger on a meat grinder because it requires more force

Question 13

Two or more inclined planes that are joined together to make a sharp edge or point form a —–

Answer 13

Wedge

Question 14

The angle of an inclined plane affects the amount of ——– needed to lift an object

Answer 14

Force

Question 15

The longer and less steep the inclined plane the (more or less) force it takes to lift an object

Answer 15

Less

Question 16

Describe a first class lever

Answer 16

The fulcrum is in the middle and the load and effort are on opposite ends.

Effort Load
-––————————————————-
Fulcrum

Question 17

Describe a second class lever

Answer 17

The load is in the middle, the effort and fulcrum are at opposite ends

                            Load               Effort -------------------------------------------------------- Fulcrum

Question 18

Describe a third class lever.

Answer 18

The effort is in the middle, with the load and fulcrum at opposite ends.

                                                    Fulcrum

Question 19

Give an example of a first class lever

Answer 19

See saw

Question 20

Give an example of a second class lever.

Answer 20

Bottle opener

Question 21

Give an example of a third class lever.

Answer 21

The arm of a person using a tennis racket to hit a ball

Question 22

Explain how some using a tennis racket is an example of a third class lever

Answer 22

The shoulder is the fulcrum, the arm applies the effort, and the load, or the resistance, is the ball hitting the racket.

Question 23

What class of lever is a nutcracker?

Answer 23

Class 2

Question 24

What class of lever is a pair of tweezers?

Answer 24

Class 3

Question 25

Which demonstrates a first class lever, a person using a crowbar to pry a rock out of a ground, or a person using a wheelbarrow? Why?

Answer 25

A person using a wheelbarrow because the fulcrum is the wheel, the effort is the handle, and the load is on top.

Question 26

In science, work means ---------

Answer 26

Force- pushing or pulling- in order to move an object a certain a certain distance

Question 27

The formula to find how much work is done

Answer 27

Work = force x distance

Question 28

What is a simple machine?

Answer 28

A tool made up of one or two parts

Question 29

What is a compound machine?

Answer 29

A tool containing one or more simple machines among its parts

Question 30

What are some examples of compound machines?

Answer 30

Cars, airplanes, elevators, staplers,

Question 31

What are the six types of simple machines?

Answer 31

``` Lever Inclined plane Wedge Screw Wheel and axle Pulley ```

Question 32

Explain how a wedge and a screw are related to the inclined plane.

Answer 32

A wedge is made up of two inclined planes that come to a point. A screw is an inclined plane that is wrapped up in a spiral

Question 33

What is a pulley?

Answer 33

A grooved wheel with a rope or chain around it

Question 34

What is a fixed pulley?

Answer 34

- It stays in one position as the wheel spins. | - Lets you pull down on one end to lift up the load on the other end

Question 35

What is a movable pulley?

Answer 35

- It is attached to the object being moved. - As force is applied to the load, the pulley moves along with the load. - Decreases the force you must apply, but the force you use is applied over a greater distance.

Question 36

What is a block and tackle?

Answer 36

A system in which several pulleys can be used with the same rope. Used to lift a very heavy load, such as a piano

Question 37

A wheel and axle is made up of

Answer 37

A wheel with a rod joined at the wheel's center

Question 38

A wheel and axle can-----

Answer 38

Increase a force or increase the distance through which a force acts

Question 39

Why is it that the amount of work done by a machine is less than the amount put into it?

Answer 39

Because of friction. The more moving parts a machine has, the more work is lost to friction. That's why people who design machines try to reduce the amount of friction between the parts to make the machine more efficient