On a velocity - time graph, how can acceleration be calculated?
From the gradient (change y/ change x)
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On a velocity - time graph, how can distance(displacement) be calculated?
From the area (under the curve)
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what is the unit of measurement of acceleration?
m/s squared
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What is the acceleration of all objects falling freely under gravity?
9.8m/s squared
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What is Newtons's first law?
the object is stationary, the object remains stationary . The object is moving, the object continues to move at the same speed and in the same direction. So the object continues to move at the same velocity.
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What does inertia mean?
The tendency of objects to continue in their state of rest/uniform motion
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What is newton's second law?
acceleration is proportional to the resultant force, and inversely proportional to the mass
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What is inertial mass?
a measure of how hard it is change the velocity of an object
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What is inertial mass defined as?
a ratio of force/acceleration
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What is Newton's third law?
Whenever two objects interact, the forces they exert on each other are equal and opposite.
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What is the thinking distance?
The distance the vehicle travels during the driver's reaction time
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What is braking distance?
The distance the vehicle travels under the braking force until it comes to a complete stop
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What is the stopping distance?
The sum of the thinking and braking distance
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What happens to the stopping distance if the speed is increased?
it increases
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What are the typical times of human reaction time?
0.2 s to 0.9 s
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What can a driver's thinking distance/ reaction time be increased by?
tiredness, drugs, alcohol and distractions
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What can a driver's braking distance be increased by?
adverse road/ weather conditions(wet or icy), poor condition of vehicle (poor brakes/tyres)
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Why do brakes dissipate thermal energy when used?
When a force is applied to the brakes of a vehicle, work done by the friction force between the brakes and the wheel reduces the kinetic energy of the vehicle and the temperature of the brakes increases.
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What is the size of the deceleration of the vehicle if there is a greater braking force?
greater
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What could large decelerations lead to?
brakes overheating/ loss of control
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How can you work out momentum?
mass x velocity
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What is the unit of measurement of momentum?
kg m/s
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What is the conservation of momentum?
Where in a closed system, the total momentum before an event is equal to the total momentum after the event
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What causes a change in momentum?
When a force acts on a moving object / able to move
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What is the force equal to?
the change of rate of momentum
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Other cards in this set
Card 2
Front
What is it called when an object is slowing down?
Back
It is decelerating
Card 3
Front
On a velocity - time graph, how can acceleration be calculated?
Back
Card 4
Front
On a velocity - time graph, how can distance(displacement) be calculated?
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