Science 2 1-18

Question 1

What is a leaver

Answer 1

simple machine usually consisting of a long, rigid object that moves around a turning point when a force is applied

Question 2

What do we mean a by first class leaver

Answer 2

A first class leaver is the lever with the fulcrum between the effort and the load

Question 3

What are the three parts of a leaver

Answer 3

Effort load and fulcrum

Question 4

What does the fulcrum mean

Answer 4

The point around which a lever turns

Question 5

What does load mean

Answer 5

The resistance of motion that the lever works against

Question 6

What does effort mean

Answer 6

force used to cause movement

Question 7

Why are first class levers called force multiplayer

Answer 7

First-class levers are force multipliers because they ‘multiply’ your effort.

Question 8

Name three examples of force multiplayers

Answer 8

A nutcracker,wheelbarrow and a shovel (they allow you to move a load with a small effort)

Question 9

What do we mean by second class leaver

Answer 9

the load between the effort and the fulcrum

Question 10

What is a mechanical advantage mean

And how do you calculate mechanical advantages

Answer 10

the ratio of the force produced by a machine

The Calculation of a mechanical advantage is the load divided by the effort

Question 11

What sort of multiplayer is a second class leaver

Answer 11

A speed multiplayer

Question 12

What Do we mean by third class leaver

Answer 12

the effort between the load and the fulcrum

Question 13

What type of multipliers are third class leavers

Answer 13

Speed multiplayers because they are desined to move a small load quickly with a large effort

Question 14

Name three examples of third class leavers

Answer 14

Hockey stick
Baseball bat
Arm

Question 15

What type of leavers are many bones in you’re body

Answer 15

Bones in your body are levers.

These are the large bones in your arms and legs

Question 16

What do we mean by saying inclined plane

Answer 16

sloping surface that assists in moving heaps objects

Question 17

Name three examples of inclined planes

Answer 17

Ramp
Slide
Hill

Question 18

What do why mean by wheel and axles

Answer 18

A lever that can rotate.

Question 19

Name three examples of wheels and axles

Answer 19

Electric Fan
Bycycle
Doorknob
😑

Question 20

Why are some wheel and axles called speed multiplayers

Answer 20

Is when the axel increase the size of the object.

Question 21

Name two examples of wheels and axles that are speed multiplayers

Answer 21

Ceiling fan

Car wheels

Question 22

Why are some wheel and axels called force multiplayers

Answer 22

It’s a system of two or more pulleys

Question 23

Name three examples of wheel and axles that are forced multiplayers

Answer 23

Door nobs
Car wheel
And a tape

Question 24

What is a pulley

Answer 24

A pulley is a wheel with a grooved rim around which a cord passes through

Question 25

Does one pulley decrease the size of the force or effort needed to lift that load

Answer 25

Yes because a single pulley simply changes the direction of the effort needed to lift a load.

Question 26

What is the advantage of using more than one pulley

Answer 26

The advantage of using more than one pulley is that it would increase strength,length and stability

Question 27

What is a block and tackle

Answer 27

A block and tackle is a mechanism consisting of ropes, pulleys and a hook.

Question 28

With a set of gears which is the driving gear

Answer 28

The wheel that is moved first is called the driving gear.

Question 29

With a set of gears which is the driven gear

Answer 29

The wheel that is moved by the driving gear is called the driven gear.

Question 30

What is a compound machine and name three examples

Answer 30

A machine that is made up of two or more simple machines. Eg : Bicyles Scissors Can opener

Question 31

Know the diagram on page 290

Answer 31

Yay ok