Simple Machines

Question 1

What is a Mechanism?

Answer 1

A machine that requires the application of a single force to do work.
Transfer this energy as efficient as possible, control direction of force

Question 2

Name the 6 simple machines?

Answer 2

Lever (fulcrum)
Pulley (fixed or moveable)
Wheel and axle
Inclined plane 
Wedge 
Screw

Question 3

What happens when a small force pushes farther away?

Answer 3

The larger force pushes closer

Question 4

When the force is bigger the distance is…..?

Answer 4

Smaller

Question 5

What simple machine do we use the most?

Answer 5

Wheel and axle, but we use all simple machines daily

Question 6

Definition of a 1st class lever?

Answer 6

Has a fulcrum between the input and output forces

Question 7

Definition of a 2nd class lever?

Answer 7

Effort (input) between fulcrum and output

Question 8

Definition of a 3rd class lever?

Answer 8

Force in the middle

Question 9

Definition of a pulley?

Answer 9

Can changed direction of input and output forces depending on whether the pulley is fixed or moveable
Consists of a grooved wheel with rope or cable looped around it

Question 10

Definition of a wheel and axle?

Answer 10

Consists of a shaft or axle that is attached to a larger disk called the wheel
Eg. Tightening a screw with a screw driver

Question 11

Definition of an inclined plane?

Answer 11

A sloping surface on which an object can move is called an inclined plane
It reduces the force needed to move an object with greater distance

Question 12

Definition of a screw?

Answer 12

An inclined plane wrapped around a rod

Question 13

The definition of a wedge?

Answer 13

An inclined plane that travels through the object or material the longer and narrower the wedge, the greater it’s mechanical advantage

Question 14

Definition of a mechanism?

Answer 14

Made of two or more simple machines

Question 15

How do you find the mechanical advantage of a lever? Ideal mechanical advantage?

Answer 15

M.A-Input\output

I.M.A- length of input arm/ length of output arm

Question 16

M.A of a pulley (fixed, moveable)

Ima of pulley

Answer 16

I.M.A- equal to the number of support ropes

Question 17

M.A of wheel and axle

I.M.A of a wheel and axle

Answer 17

I.M.A- radius of wheel/radius of axle

Radius of axle/ radius of wheel

Question 18

I.M.A for an inclined plane?

Answer 18

I.M.A- length of ramp/ height of ramp

Question 19

I.M.A of a screw

Answer 19

The length of the three gives the ideal mechanical advantage

Question 20

I.M.A of a wedge?

Answer 20

The longer and narrower the wedge the greater it’s mechanical advantage

Question 21

What is the definition of Efficiency?

Answer 21

The efficiency of a machine measures the useful work done by the machine compared to the work needed to operate it.

Question 22

How to calculate efficiency?

Answer 22

Useful output work (j) x 100%\input work

Question 23

What type of simple machines consists of two inclined planes back to back?

Answer 23

Wedge

Question 24

What type of simple machine is used in cars, trucks and bicycles?

Answer 24

Wheel and axle

Question 25

What type of simple machine could be used to hold two prices of wood together?

Answer 25

Screw

Question 26

When two or more simple machines are put together, what is it called?

Answer 26

Compound machines

Question 27

Which item is an example of a wedge?

Answer 27

Axe blade

Question 28

Simple machines make a job easier but they do not change the total amount of:?

Answer 28

Force

Question 29

The amount a simple machines increased the effort force is referred to as:?

Answer 29

Mechanical advantage

Question 30

What type of simple machine consisting of a slanted flat slope helps make a moving object up easier but requires people to move the object a longer distance?

Answer 30

Inclined plane

Question 31

What can a simple machine change the size or direction of?

Answer 31

A force

Question 32

What type of simple machine consists of a bar and a fulcrum?

Answer 32

A lever

Question 33

What is the definition of a machine?

Answer 33

Any device that helps us do work

Question 34

Name the three ways make work easier?

Answer 34

Increasing the force that can be applied Increasing the distance over which the force is applied But changing the direction of the force