Physics Unit 2

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  • Created by: Emily
  • Created on: 16-05-13 16:05
What is the difference between speed and velocity?
Speed is how fast you are going, whereas velocity must also have a direction specified as well as the speed
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How do you calculate speed?
Speed = distance / time
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What is acceleration?
How quickly the velocity is changing, this can be a change in speed, a change in direction or both
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What is the formula for acceleration?
Acceleration = change in velocity / speed
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If a line on a velocity-time graph is horizontal, what does this mean?
There is a steady or constant speed
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Gravitational force is the force of attraction between all masses, true or false?
True
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Define the difference between mass and weight
Mass is the amount of 'stuff' in an object (measured in kg), weight is the centre of the Earth (measured in N)
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The formula to find weight is weight = mass x gravitational field strength, how would you work out the mass?
Mass = weight / gravitational field strength
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What is meant by a 'resultant force'?
The overall force acting upon an object, this tells us whether the object is accelerating decelerating or stationary
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If there is a resultant force acting upon an object what will happen?
There will be a change in the object's velocity
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What would the resultant force have to be for an object to be stationary?
Zero
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If there is no resultant force on a moving object, what will happen?
It will carry on moving at the same velocity - the same speed and direction
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What causes an object to accelerate or decelerate?
Having a non-zero resultant force, meaning that one of the forces on the object is bigger or smaller than the rest - it can take five forms, starting, stopping, speeding up, slowing down and changing direction
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When two objects interact, are the forces they exert on each other equal or not?
Yes, the forces exerted on each other are equal and opposite
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Which direction does friction act in?
The opposite direction to movement
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When do you get friction?
When two surfaces are in contact and at least one is moving, or when an object passes through a fluid
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What is terminal velocity?
The point at which an objects frictional force is equal to its accelerating force, so its reached it maximum speed and is moving at a contant rate
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Identify the two main things affecting someones stopping distance
Their thinking distance and their stopping distance
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What could affect someones breaking distance?
How fast they're going / how good the breaks are / how good the tyres are / how good the grip is
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Finish this statement: when a force moves an object through a distance energy is transferred and...
Work is done
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What is the equation for finding out the 'work done'?
Work done = force x distance
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What is the gravitational potential energy?
The energy that an object has because of its vertical position in a gravitational field
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What is the symbol formula for finding out kinetic energy?
Ek = 1/2 x m x v(squared)
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What happens to the potential energy when something falls?
The potential energy is converted into kinetic energy (kinetic energy gained = potential energy lost)
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What is the equation that realates the force of a spring and its extension?
F = k x e
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Other cards in this set

Card 2

Front

How do you calculate speed?

Back

Speed = distance / time

Card 3

Front

What is acceleration?

Back

Preview of the front of card 3

Card 4

Front

What is the formula for acceleration?

Back

Preview of the front of card 4

Card 5

Front

If a line on a velocity-time graph is horizontal, what does this mean?

Back

Preview of the front of card 5
View more cards

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