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