Changes in distance in one direction is described as positive and changes in the opposite direction are described as negative.
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What do you need to calculate an objects speed?
Distance and Time
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How can you calculate speed?
Speed=Distance/Time
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What are the two different ways of measuring speed?
Instantaneous and average speed
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What is the instantaneous velocity?
The instantaneous speed with an indication of direction.
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What does it mean is happening if the line of a distance-time graph is curved?
The speed of an object is moving.
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What does the gradient of a distance-time graph represent?
How quickly it is increasing in speed (accelerating)
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What are speed-time graphs in lorry tachographs used for?
To make sure they don't exceed the speed limit and rest for suitable amounts of time.
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Can a velocity-time graph have negative values for the velocity axis?
Yes
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How do you measure acceleration?
Acceleration=Change in speed/Time taken
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The forces in an interaction pair are...
Equal in size and opposite in direction and they act on different objects.
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How do people walk?
By applying a force on to the earth and having an equal and opposite force generated. The person moves because they have a much smaller mass than the Earth.
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Name three examples of forces in action.
Gravity (weight) Air resistance (drag) Rocket and jet engines
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What does the size of an arrow represent in a forces diagram?
The size of the force.
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What does the direction of an arrow represent in a forces diagram?
The direction the forced is acting in.
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The overall effect of two or more forces is called the...
Resultant force.
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What is momentum?
The measure of the motion of an object.
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How can you calculate momentum?
Momentum = Mass x Velocity
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If the resultant force acting on an object is not zero it will..
Cause a change of momentum.
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Collision's can cause a change in an object's...
Momentum
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If the change in momentum is spread out over a longer period of time, the resultant force will be smaller/larger?
Smaller
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The force of the impact on the human body can be reduced by increasing the..
Time of impact
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What are the two forces that cars and bicycles have?
Driving force and Counter force
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What does the amount of kinetic energy that an object has rely on?
Mass and velocity
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Kinetic energy can be found by...
Kinetic energy= 1/2 x Mass x Velocity
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What are the two forces that oppose motion when an object falls?
Air resistance and Gravity
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When work is done on an object, the object losses/gains energy?
Gains
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When work is done by an object, the object losses/gains energy?
Losses
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The amount of work done is the same as...
the amount of energy transferred.
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How do you calculate the work done?
Work done= Force x Distance
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What does the gravitational potential energy depend on?
Mass and height above ground
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Other cards in this set
Card 2
Front
How it velocity measured?
Back
Changes in distance in one direction is described as positive and changes in the opposite direction are described as negative.
Card 3
Front
What do you need to calculate an objects speed?
Back
Card 4
Front
How can you calculate speed?
Back
Card 5
Front
What are the two different ways of measuring speed?
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