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48 Cards in this Set
- Front
- Back
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What do distance-time graphs show?
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They show how far something travels in a certain amount of time.
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What does a straight line show in a distance-time graph?
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That the object is moving at a constant speed.
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What does a horizontal line show in a distance-time graph?
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That the object is not moving.
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What does the steeper the line show in a distance-time graph?
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The faster the object is moving.
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What does the slope of a distance-time graph represent?
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The speed.
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What do speed-time graphs show?
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How the speed of something is changing in a given time.
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What does a straight line going upwards show in a speed-time graph?
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That the object is moving at constant acceleration.
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What does a horizontal line show in a speed-time graph?
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That the object is moving at a constant speed.
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What does a straight line going downwards show in a speed-time graph?
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That the object is slowing down at constant deceleration.
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What does the steeper the line show in a speed-time graph?
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The faster the object is accelerating or decelerating.
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What does the slope of a speed-time graph represent?
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Acceleration.
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What does the area under a speed-time graph represent?
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Distance travelled.
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What is the formula for calculating speed?
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Speed=distance/time
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What is the formula for calculating acceleration?
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Acceleration=velocity/time
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What is the formula for calculating falling objects?
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Weight=mass x gravitational field strength
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How can you describe the weight of an object?
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It is the force of gravity on it.
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How can you describe the mass of an object?
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It is the quantity of matter on it.
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What effect do forces have on objects in general?
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They change the speed.
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What does gravity do?
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Pulls you down.
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What does friction do?
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It is the force between two objects,stops motion and creates heat.
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What does the forward force do?
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Pushes you forward.
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What does air resistance do?
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It pushes against things which are moving, such as a parachute for example.
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What does upthrust do?
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It pushes an object up, such as a boat for example.
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What do balanced forces mean?
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No change in velocity, if all the forces on the object are balanced,then it'll stay still.
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What does there need to be for an object to keep at a steady speed?
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A zero resultant force.
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What does a resultant force mean?
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Acceleration or deceleration,if there is an unbalanced force then the object will accelerate in that direction.
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What is the formula for the calculation of resultant forces?
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Force=ma
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What is the stopping distance of a car?
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It is the distance covered in the time between the driver first spotting a hazard and the car coming to a complete stop.
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What is the thinking distance?
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The time between noticing the hazard and applying the brakes.
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What is the braking distance?
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The distance the car travels during its deceleration after applying the brakes.
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Name three things which can effect the thinking distance?
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How fast you're going, how dopey you are (tiredness/drugs/alcohol/old age) and how bad the visibility is (weather).
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What four things can affect the braking distance?
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How fast you're going, how heavily loaded the vehicle is, how good your brakes are and how good the grip is (road surface/weather conditions/tyres).
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When does momentum increase?
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When either the mass or velocity does.
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What is momentum?
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It is the mass multiplied by the velocity of an object.
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What is the formula for the calculation of momentum?
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momentum=mass x velocity
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What do forces do to momentum?
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It changes it, a larger force means a faster change of momentum and a bigger acceleration therefore.
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What is the formula for the calculation of forces acting on momentum?
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Force acting=change in momentum/time taken for change to happen
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What is kinetic energy?
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The energy of movement.
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What is the formula for the calculation of kinetic energy?
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1/2 x mass x speed(squared)
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Name the nine types of energy.
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Electrical, light, sound, kinetic, nuclear, thermal, gravitational potential, elastic potential, chemical.
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What is electrical energy?
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Whenever a current flows.
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What is light energy and sound energy?
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Light energy is from the sun and light bulbs whilst sound energy is from loudspeakers or anything noisy.
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What is nuclear energy?
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Released from nuclear reactions.
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What is thermal energy?
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It flows from hot objects to colder ones.
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What is gravitational potential energy?
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Possessed by anything which can fall.
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What is elastic potential energy?
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Possessed by springs, elastic rubber bands etc.
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What is chemical energy?
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Possessed by foods, fuels,batteries etc.
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Why are potential and chemical energy types, forms of stored energy?
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The energy is not doing anything,its kind of waiting to happen to be turned into other forms of energy.
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