# P4

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• Created by: zoe
• Created on: 16-03-14 09:59
What does the velocity tell you?
speed and direction of travel
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What is the speed of an object at a particular point in time called?
the instantaneous speed
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What does the gradient of a straight line graph show?
the speed of the object
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How do you work out the speed of an object using the gradient of a displacement time graph?
take two points from the gradient, read off the displacement traveled between the two points, work out the time taken between these points, divide the displacement by the time
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What is the instantaneous velocity of an object?
its instantaneous speed together with an indication of direction
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What does a curved distance time graph mean?
the speed of an object is changing
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What does the gradient of a speed-time graph show?
how quickly the object is accelerating
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When does a force occur?
when two objects interact with each other
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What are equal in size and opposite in direction and they act on different objects?
the forces in an interaction pair
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What is friction?
when two objects try to slide past one another, both objects experience a force that tries to stop them moving
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What is the overall effect of adding or subtracting forces called?
the resultant force
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What is momentum?
a measure of the motion of an object
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How can the force of an impact be reduced?
increasing the time of an impact
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What devices do cars have to increase impact time?
seat belts, crumple zones, air bags
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What does the amount of kinetic energy an object has depend on?
the mass and velocity
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What two forces help and prevent things from moving?
driving force and counter force
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What is it called when an object is lifted above the ground meaning works been done by lifting against gravity and could be done by letting it fall?
gravitational potential energy (GPE)
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## Other cards in this set

### Card 2

#### Front

What is the speed of an object at a particular point in time called?

#### Back

the instantaneous speed

### Card 3

#### Front

What does the gradient of a straight line graph show?

### Card 4

#### Front

How do you work out the speed of an object using the gradient of a displacement time graph?

### Card 5

#### Front

What is the instantaneous velocity of an object?