Physics

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How do you calculate speed/The Gradient/slope of the graph?
Average speed (m/s)= Distance Travelled (m)/time taken (s)
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What does a horizontal line mean on a distance-time graph?
The car is at rest
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What happens when the car is moving at a constant speed (distance-time graph)?
The gradient of the graph is level (Straight line)
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What happens if the car travels faster (distance-time graph)?
The line will be steeper
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What is velocity?
Speed in a particular direction.
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What happens if an object changes velocity?
It is accelerating
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How do you work out acceleration?
Acceleration (m/s2)=Change in velocity (m/s)/Time taken for the change (s)
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What does a horiztonal line in a velocity-time graph?
That the car is travelling with a constant velocity
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What happens when the car accelerates more rapidly on a velocity time graph?
The graph has a steeper slope
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How do you work out the distance travelled using a velocity time graph?
It is the area under the graph line
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What happens when an object's forces are balanced (no resultant force)
When an object is at rest it stays at rest; if it is moving and it keeps on moving at a constant speed in a straight line
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What happens when the forces on an object do not cancel out ( there is a resultant force/unbalanced forces)?
A stationary object will start to move in the direction of the resultant force; an object already moving in the direction of the force will speed up (accelerate); and object moving in the oppposite direction to the force will slow down (decelerate)
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What happens when the resultant force is greater?
The greater the aceleration (or deceleration)
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What happens to the force when the mass of an object increases?
The bigger the force that is needed to give it the same aceleration.
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When does a force of friction act?
When an object moves through the air or water; when solid surfaces slide, or try to slide across each other. The objects heat up (and wear away)
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What is terminal velocity?
Object falls through (gas or liquid); faster it moves;greater force of friction. When body falls; at start acelerates due to force of gravity (weight). Frictional forces (e.g. air resistance) increase until balance. R.force=0. Terminal velocity.
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How do you work out resultant force?
Resultant force (N)=Mass (kg) * Acceleration (m/s2)
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What happens when a force moves an object?
Energy is transferred and work is done?
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What does work done equal?
Energy transferred (J)
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How do you work out work done?
Work done (J)=Force applied (N) * Distance moved in the direction of the force (m)
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What happens when an object is lifted up?
Work is done against the force of gravity, its weight.
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Other cards in this set

Card 2

Front

What does a horizontal line mean on a distance-time graph?

Back

The car is at rest

Card 3

Front

What happens when the car is moving at a constant speed (distance-time graph)?

Back

Preview of the front of card 3

Card 4

Front

What happens if the car travels faster (distance-time graph)?

Back

Preview of the front of card 4

Card 5

Front

What is velocity?

Back

Preview of the front of card 5
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