All P3 Formulas (must know!) Flashcards
What is the formula to find out the speed?
Distance = speed x time
What is the average speed?
When an object is slowing down or speeding up, it has changed its speed. Therefore we need to find its AVERAGE SPEED
What is the formula to find the average speed?
Average speed=
2
U= speed at start V= speed at end
What is another word for gradient in a distance-time graph?
Speed
What does a flat section in a graph mean?
When an object stops (has no speed)
What is acceleration?
How quickly your speeding up
What is the formula for acceleration ?
Acceleration =
Time taken
What is another word for a decrease in speed?
Deceleration
What are the units for acceleration or deceleration?
M/s2
What is another word for gradient in a speed-time graph?
Acceleration
What does velocity tell you?
The speed and direction of an object
What is the unit “g”? Is it not grams
The gravitational field strength
OR
acceleration due to gravity
What is the difference between weight and mass?
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)
What is the unit for weight?
N
Newtons
What is the unit for mass?
Kilograms
What is the formula of weight?
Weight =
Mass x gravitational field strength
W = m x g
What is a resultant force?
An unbalanced force
This will cause acceleration
What happens when a force of an object is all balanced ?
Be going at a steady speed, in the same direction
What is the formula for force?
Force =
Mass x acceleration
What is the unit for resultant force?
F
What is the momentum?
How far an object will travel until it stops moving
Measure in kg m/s
What is the formula for momentum ? Do not forget the units
Momentum (kg m/s) =
Mass (kg) x velocity (m/s)
What can change the momentum of an object?
A force acting on the object
An increase in force can accelerate an object
What is the formula for a force acting on a momentum (changing it)?
Force acting (N) =
Time taken for the change to happen (s)
What is work done?
When a force moves an object
What is the formula to calculate the amount of work done?
Work done=
Force x distance
How does an object gain gravitational Potential energy?
By being above the ground
A ball will have a g.p.e in the air but not on the ground
What is the formula for g.p.e ?
Mass x g x height
G = gravitational field strength (acceleration due to gravity)
What is the gravitational field strength on earth?
10 m/s2
Remember!
What is kinetic energy?
The energy an object has when it is moving
What is the kinetic energy formula?
Kinetic energy =
1/2 x mass x speed2
