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AQA - A Level Physics - Mechanics and Materials #1
Recap
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Nighthawk
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Last updated: July 8, 2020
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July 8, 2020
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Hint
Answer
Define displacement
The distance of an object from a point in a specific direction (vector)
Define velocity
Rate of change of displacement (vector)
Define speed
Rate of change of distance (scalar)
Define acceleration
Rate of change of velocity (vector)
What are the units of acceleration
ms^-2
Define constant velocity
Speed and direction of motion don't change
What is shown by the gradient of a distance-time graph
Speed
What is shown by the gradient of a displacement-time graph
Velocity
What is shown by the gradient of a velocity-time graph
Acceleration
What is shown by thearea under a velocity-time graph
Change in displacement
What is shown by the area under an acceleration-time graph
Change in velocity
When would you use a SUVAT equation
Used for motion of an object along a straight line with constant acceleration
What is the effect of mass on the acceleration for an object in free-fall
None
Describe the path of projectiles
Parabola / parabolic
Hint
Answer
What is the effect of air resistance on horizontal projectile motion
Horizontal speed is reduced and hence range is reduced.
An object projected horizontally has an initial vertical velocity of
Zero
What is the angle of projection that results in maximum range
45 degrees
The acceleration of a projectile
Is always g downwards
What happens to the horizontal velocity in projectile motion
Constant
If a projectile returns to its starting height initial and final velocities have
the same magnitude
What is the equation used for the horizontal component of projectile motion
Displacement = Velocity x time (since horizontal velocity is constant)
What is the vertical component of the velocity when at the maximum height?
Zero
Why can SUVAT equations can be used for the vertical component of projectile motion
Since the motion is in a single direction with a constant acceleration
What is the effect of air resistance on the motion of an object projected above the horizontal
Reduces the maximum height reached and makes the descent of the projectile steeper than the ascent.
Define air resistance
The drag force exerted due to friction between the projectile and the air. Always acts in the opposite direction to motion and increases with speed.
What are the forces on an object falling at terminal velocity
The drag force must be equal and opposite to the weight
Define friction
Force that acts between surfaces to oppose motion
Define inertia
The resistance of an object to changes in its motion
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AQA - AS Physics
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