P2.3

Question 1

What are plastic materials

Answer 1

Materials that stretch but don’t return to their original shape they are deformed when you apply forces and stay that way when u remove them.

Question 2

What are elastic materials

Answer 2

Return to their original shape when you remove the forces

Question 3

What is an elastic material shown as on a graph

Answer 3

A straight line

Question 4

What is the limit of proportionality

Answer 4

The point where the graph of force against extension is no longer straight and then curved.

Question 5

What is the elastic limit

Answer 5

The point where it stops behaving elastic and after this point won’t return to it’s original shape.

Question 6

Equation for force exerted by a spring

Answer 6

Force exerted by a spring = spring constant x extension

Question 7

What is the gradient of the force extension graph

Answer 7

The spring constant

Question 8

When is force and extension proportional

Answer 8

Up to the limit of proportionality

Question 9

Formula for extension

Answer 9

extension = final length - original length

Question 10

equation for energy transferred by the spring

Answer 10

energy transferred in stretching = 1/2 x spring constant x extension squared

Question 11

What is a gravitational field

Answer 11

A region where a mass experiences an attractive force

Question 12

Formula for gravity force

Answer 12

gravity force = mass x gravitational field strength

Question 13

What is gravitational field strength

Answer 13

A measure of the force on 1kg of mass when it is in the gravitational field of another mass

Question 14

Weight formula

Answer 14

Weight = mass x gravitational field strength

Question 15

what is the acceleration due to gravity

Answer 15

10 m/s squared

Question 16

Formula for gravitational potential energy

Answer 16

gravitational potential energy = mass x height x gravitational field strength

Question 17

What is a moment

Answer 17

A turning effect

Question 18

What does a moment depend upon

Answer 18

It depends on the size of the force and the distance from the pivot where the force acts, where the direction of the force and the distance measures are at 90 degrees to eachother

Question 19

Moment formula

Answer 19

Moment = force x distance

Question 20

When is an object balanced

Answer 20

An object is balanced when the anticlockwise moments = the clockwise moments

Question 21

What is a lever

Answer 21

A lever is a force multiplier as it transmits force by rotating around a pivot

Question 22

What is the effort

Answer 22

the force exerted on the lever

Question 23

What is the load

Answer 23

the force the lever exerts on the load

Question 24

mechanical advantage formula

Answer 24

mechanical advantage = load/effort

Question 25

Formula for force output

Answer 25

effort x distance from pivot to effort = load x distance from load to pivot

Question 26

What does the ratios of cogs tell you

Answer 26

The ratio of diameters of the cogs gives you the force multiplication of it

Question 27

What is essential for hydraulics

Answer 27

Pressure is conserved in liquids

Question 28

When a larger cog feeds into a smaller cog what happens

Answer 28

speed multiplication