All P3 Formulas (must know!)

Question 1

What is the formula to find out the speed?

Answer 1

Distance = speed x time

Question 2

What is the average speed?

Answer 2

When an object is slowing down or speeding up, it has changed its speed. Therefore we need to find its AVERAGE SPEED

Question 3

What is the formula to find the average speed?

Answer 3

Average speed=

 2

U= speed at start
V= speed at end

Question 4

What is another word for gradient in a distance-time graph?

Answer 4

Speed

Question 5

What does a flat section in a graph mean?

Answer 5

When an object stops (has no speed)

Question 6

What is acceleration?

Answer 6

How quickly your speeding up

Question 7

What is the formula for acceleration ?

Answer 7

Acceleration =

Time taken

Question 8

What is another word for a decrease in speed?

Answer 8

Deceleration

Question 9

What are the units for acceleration or deceleration?

Answer 9

M/s2

Question 10

What is another word for gradient in a speed-time graph?

Answer 10

Acceleration

Question 11

What does velocity tell you?

Answer 11

The speed and direction of an object

Question 12

What is the unit “g”? Is it not grams

Answer 12

The gravitational field strength

OR

acceleration due to gravity

Question 13

What is the difference between weight and mass?

Answer 13

Mass -
the amount of “stuff” something has, it will not change no matter where you are (space or earth)

Weight -
Cause by the pull of gravity
(Your weight will change when you are in space as the gravitational pull will be different there) (mass will not change)

Question 14

What is the unit for weight?

Answer 14

N

Newtons

Question 15

What is the unit for mass?

Answer 15

Kilograms

Question 16

What is the formula of weight?

Answer 16

Weight =

Mass x gravitational field strength

W = m x g

Question 17

What is a resultant force?

Answer 17

An unbalanced force

This will cause acceleration

Question 18

What happens when a force of an object is all balanced ?

Answer 18

Be going at a steady speed, in the same direction

Question 19

What is the formula for force?

Answer 19

Force =

Mass x acceleration

Question 20

What is the unit for resultant force?

Answer 20

F

Question 21

What is the momentum?

Answer 21

How far an object will travel until it stops moving

Measure in kg m/s

Question 22

What is the formula for momentum ? Do not forget the units

Answer 22

Momentum (kg m/s) =

Mass (kg) x velocity (m/s)

Question 23

What can change the momentum of an object?

Answer 23

A force acting on the object

An increase in force can accelerate an object

Question 24

What is the formula for a force acting on a momentum (changing it)?

Answer 24

Force acting (N) =

Time taken for the change to happen (s)

Question 25

What is work done?

Answer 25

When a force moves an object

Question 26

What is the formula to calculate the amount of work done?

Answer 26

Work done=

Force x distance

Question 27

How does an object gain gravitational Potential energy?

Answer 27

By being above the ground

A ball will have a g.p.e in the air but not on the ground

Question 28

What is the formula for g.p.e ?

Answer 28

Mass x g x height

G = gravitational field strength (acceleration due to gravity)

Question 29

What is the gravitational field strength on earth?

Answer 29

10 m/s2

Remember!

Question 30

What is kinetic energy?

Answer 30

The energy an object has when it is moving

Question 31

What is the kinetic energy formula?

Answer 31

Kinetic energy =

1/2 x mass x speed2