GCSE C21 P4 Explaining Motion revision
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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| Instantaneous Speed = | Distance / Time (small distance and short time)
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| Average Speed = | Distance / Time (journey distance and journey time)
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| Speed from a distance time graph… | find the gradient of the graph = vertical / horizontal
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| In a distance time graph horizontal means | the object is stopped
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| In a distance time graph the steeper the slope... | the faster the object is going
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| In a distance time graph the downhill section means | the object is moving backwards / towards you
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| Velocity is speed and | direction
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| In a velocity time graph gradient represents.... | acceleration
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| In a velocity time graph horizontal means | constant speed
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| In a velocity time graph the steeper the slope... | the greater the acceleration
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| In a velocity time graph uphill sections indicate... | Acceleration or speeding up (positive acceleration)
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| In a velocity time graph downhill sections indicate.. | deceleration or slowing down (negative acceleration)
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| Newton’s third law: if you push against a wall the wall... | pushes back on you
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| Resultant force is... | the overall force acting on an object.
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| Momentum = | mass x velocity
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| Change in momentum = | FORCE x TIME (resultant FORCE x TIME for which the force acts)
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| Change in energy is the same as | Work done
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| Work Done = | Force x Distance
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| Kinetic Energy | 1/2 mass x velocity squared
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| The formula for change in gravitational potential energy is | Weight x change in height
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| Falling objects convert gravitational potential energy into | Kinetic energy
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| Units for kinetic energy | J or joules
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| Units for potential energy | J or joules
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| Units for mass | kg or kilograms
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| Units for speed (standard scientific units) | m/s or metres per second
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| Units for momentum | kg m/s or kilogram metres per second
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| Units for work done | J or joules
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| Units for weight | N or newtons (weight is a force)
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| Units for force | N or newtons
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