Explaining Motion
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What does velocity tell you? | Speed and direction of travel.
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| How it velocity measured? | 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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| Name three examples of forces in action. | Gravity (weight)
Air resistance (drag)
Rocket and jet engines
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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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| What is friction? | The resistance force between two surfaces as they move against each other.
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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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Created by:
08burkeh
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