AQA - A Level Physics - Mechanics and Materials #1

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Last updated: July 8, 2020

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First submitted	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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