Simple Machines

Question 1

What is a second class lever

Answer 1

When the fulcrum is closer to the load force than the effort force

Question 2

What is a third class lever

Answer 2

When the fulcrum is closer to the effort force than the load force

Question 3

What is a first class lever

Answer 3

When the fulcrum is between the load force and the effort force

Question 4

3 examples of simple machines with a mechanical advantage of >1

Answer 4

Hammer. Screw driver. Ramp

Question 5

3 examples of simple machines with a mechanical advantage of

Answer 5

Hockey stick. Baseball bat. Garden rake

Question 6

A simple machine with a mechanical advantage of 1

Answer 6

Fixed pulley

Question 7

What are The 6 simple machines

Answer 7

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

Question 8

What is a lever

Answer 8

A rigid bad supported that is supported at one point

Question 9

What are the 3 classes of levers

Answer 9

1st class. 2nd class. 3rd class

Question 10

What is always the mechanical advantage of a 3rd class lever

Question 11

How to find the IMA of a lever

Answer 11

Length of the input arm/length of the output arm

Question 12

What is a pulley

Answer 12

A grooved wheel with a rope or cable looped around it

Question 13

What is the IMA of a fixed pulley

Answer 13

1

Question 14

What is the IMA of a moveable pulley

Answer 14

2

Question 15

What is the IMA of a pulley equal to?

Answer 15

The number of support ropes

Question 16

What is a wheel and axle

Answer 16

It is made of a shaft (axle) that is attached to a larger disc (wheel)

Question 17

When is the IMA of a wheel and axle greater than 1

Answer 17

When an input force acts on the wheel and then output force is provided by the axle

Question 18

When the input force is applied to the wheel, how do u get the IMA

Answer 18

Divide the radius of the wheel by the radius of the axle

Question 19

When the input force is closer to the centre of the axle than the output force, what is the IMA

Question 20

What is an inclined plane

Answer 20

A sloping surface on which an object can move on

Question 21

What does an inclined plane do

Answer 21

It increases the distance an object has to move but reduces the force needed to move it

Question 22

How do u find the IMA of an inclined plane

Answer 22

Divide the length of the ramp by the height

Question 23

What is a screw

Answer 23

An inclined plane wrapped around a rod

Question 24

What is the thread of a screw

Answer 24

A continuous inclined plane

Question 25

How do u find the MA of a screw

Answer 25

The difference between the length of the rod and the length of the thread

Question 26

What is a wedge

Answer 26

An inclined plane that travels through an object

Question 27

What are 2 factors that can change the MA of a wedge

Answer 27

It's length and its thickness

Question 28

What is a mechanism

Answer 28

2 or more simple machines working together

Question 29

What is efficiency

Answer 29

It measures the useful work done by the machine compared to the work needed to operate it

Question 30

What do highly efficient machines have less of and what do they produce less of

Answer 30

Friction and heat from friction

Question 31

How do u calculate efficiency

Answer 31

Useful output work x 100% divided by the input work

Question 32

Example of a 1st class lever

Answer 32

Paint can

Question 33

Example of a 2nd class lever

Answer 33

Wheelbarrow

Question 34

Example of a 3rd class lever

Answer 34

Rake

Question 35

Example of a pulley

Answer 35

Elevator

Question 36

Example of a screw

Answer 36

Lightbulb

Question 37

Example of a wheel and axle

Answer 37

Wheelchair

Question 38

Example of an inclined plane

Answer 38

Ramp

Question 39

Example of a wedge

Answer 39

Doorstop

Question 40

Examples of a mechanism

Answer 40

Scissors and wheelbarrow

Question 41

What is mechanical advantage

Answer 41

- how much faster and easier a machine makes you work | - the number of times a machine multiplies your effort force

Question 42

What does MA do

Answer 42

- increases the distance over which a force is applied - it changes the direction of a force - it increases the force that can be applied to an object

Question 43

What do simple machines control

Answer 43

Force and direction

Question 44

What is a machine

Answer 44

Any mechanical system that reduces the force needed to accomplish work

Question 45

What is a block and tackle pulley

Answer 45

A pulley with at least one moveable pulley and at least one fixed pulley