Physics Best Flashcards
What is the difference between speed and velocity
Velocity is speed in a given direction
What does the gradient of a distance time graph tell you
Speed
What do flat horizontal sections on a distance time graph represent
Where it is stationary
What do straight uphill or downhill sections on a distance time graph represent
Steady speed
On a distance time graph the steeper the gradient…..
The faster the speed
What do curved represent on a distance time graph
Acceleration or deceleration
What does a steepening curve represent on a distance time graph
Speeding up
What does a levelling off curve represent on a distance time graph
Slowing down
What is acceleration
How quickly velocity in changing
What can a change in velocity be
Change in speed or change in direction
What does the gradient of a velocity time graph represent
Acceleration
Why a do flat sections on a velocity time graph represent
Steady speed
The steeper the velocity time graph….
The greater the acceleration or deceleration
What does the area under a velocity time graph represent
The distance traveled in that time interval
What does a curve mean on a velocity time graph
Changing acceleration
How is velocity found on a velocity time graph
Reading off the velocity axis
What 2 effects does gravity have
Makes things accelerate towards the ground, 10m/s2 on earth
Gives everything a weight
What is mass
The amount of matter in an object
What is weight caused by
The pull of the gravitational force towards the earth center
An object has the …… Mass on earth as on the moon but it’s weight will be …….
Same
Different
Will a 1kg mass weigh more or less on the moon than on earth?
Weigh less (1.6N) on the moon than on earth (10N)
Why will a mass weigh less on the moon than on the earth
Less of a gravitational force pulling it
What is weight measured in
Newtons
Is weight a force
Yes
What is weight measured with
Newton meter
Is mass a force
No
What is mass measured with and what units
Kg with a mass balance
What is GFS is on earth
10 N/Kg
What is GFS on the moon
1.6N/Kg
What will the overall effect of the forces on an object decide about the motion
Where there it will accelerate, decelerate or sty at a steady speed
What is the resultant force
Single force that has the same effect as all forces acting on the object
What direction does gravity act
Downwards
If there is a resultant force what will happen to the object
Change its state of rest or motion; causes a change in velocity
What is a reaction force
Force opposing gravity so the forces balance, without this force it would accelerate
What will happen if the resultant force of an stationary object is 0
It will stay stationary
If there isn’t a resultant force acting on a moving object what will happen to its motion
Keep on moving at the same velocity then all the forces on it must be balanced
If there is a non zero resultant force what happens to the motion of the one jet
It will accelerate in the direction of the force
What 5 forms the acceleration of a non zero resultant force take
Start Stop Speed up Slow down Change direction
Why is ‘if something is moving there must be an overall resultant force acting on it’?
If there is an overall resultant force it will accelerate, you get a steady speed if the resultant force is zero
When to forces interact what are the forces they exert on each other like
Equal and opposite
What are speed and velocity both measured in
M/s
