A LEVEL 3 GCE PHYSICS ACTUAL
QUESTIONS AND VERIFIED ANSWERS
COMPLETE STUDY PACK
●● what is speed
Answer: scalar - distance/time
●● what is velocity
Answer: vector - displacement/time
●● what is instantaneous velocity
Answer: The velocity at an instant, measured over a time that is much
shorter than the time of the overall measurements
●● what is average velocity
Answer: total displacement divided by total time
●● what is acceleration
Answer: The rate at which velocity changes
●● equations of motion
Answer: v = u + at, s = 1/2(v+u)t, s = ut + 1/2at^2, v^2 = u^2 + 2as
,●● what happens with objects in the absence of air resistance?
Answer: fall freely with the same acceleration. acceleration of free fall
on earth is commonly termed the acceleration due to gravity and is 9.81
m/s^2
●● objects projected horizontally
Answer: will still fall freely with a vertical downward acceleration of
9.81
●● for objects projected at an angle to the horizontal
Answer: vertical and horizontal motion should be treated separately by
considering the components of the velocity in each plane
●● gradient of a displacement time graph
Answer: velocity
●● instantaneous velocity on a displacement time graph
Answer: gradient of the graph at a point on the line found using a
tangent
●● area under a velocity time graph
Answer: displacement
,●● gradient of velocity time graph
Answer: acceleration
●● if object is slowing down on velocity time graph
Answer: gradient negative
●● negative value of acceleration indicates...
Answer: the vector has the opposite direction to the velocity
●● road test for a car - why is acceleration unlikely to be uniform
Answer: gear changes
●●
Answer:
●●
Answer:
●● why a skii jumper would need a larger velocity than calculated
Answer: The jumper is affected by air resistance [1] The position and
shape of the body relative to the skis affects the trajectory of the jump.
, ●● how a ball's trajectory is affected by spin
Answer: The effect of air resistance [1] will mean that the range of the
ball will be reduced. A ball with back-spin will also swerve upwards,
increasing the height of the shot and further reducing its length.
●● momentum
Answer: vector since velocity is a vector - p=mv
●● since momentum has both size and direction...
Answer: it can have a negative value if the object is travelling in the
opposite direction to its initial direction
●● the principle of conservation of momentum
Answer: in any interaction between two bodies, linear momentum is
conserved, provided that no resultant force acts on the bodies
●● newton's second law of motion... (momentum)
Answer: the resultant force exerted on a body is directly proportional to
the rate of change of linear momentum of the body
●● impulse
Answer: force x time = change in momentum
QUESTIONS AND VERIFIED ANSWERS
COMPLETE STUDY PACK
●● what is speed
Answer: scalar - distance/time
●● what is velocity
Answer: vector - displacement/time
●● what is instantaneous velocity
Answer: The velocity at an instant, measured over a time that is much
shorter than the time of the overall measurements
●● what is average velocity
Answer: total displacement divided by total time
●● what is acceleration
Answer: The rate at which velocity changes
●● equations of motion
Answer: v = u + at, s = 1/2(v+u)t, s = ut + 1/2at^2, v^2 = u^2 + 2as
,●● what happens with objects in the absence of air resistance?
Answer: fall freely with the same acceleration. acceleration of free fall
on earth is commonly termed the acceleration due to gravity and is 9.81
m/s^2
●● objects projected horizontally
Answer: will still fall freely with a vertical downward acceleration of
9.81
●● for objects projected at an angle to the horizontal
Answer: vertical and horizontal motion should be treated separately by
considering the components of the velocity in each plane
●● gradient of a displacement time graph
Answer: velocity
●● instantaneous velocity on a displacement time graph
Answer: gradient of the graph at a point on the line found using a
tangent
●● area under a velocity time graph
Answer: displacement
,●● gradient of velocity time graph
Answer: acceleration
●● if object is slowing down on velocity time graph
Answer: gradient negative
●● negative value of acceleration indicates...
Answer: the vector has the opposite direction to the velocity
●● road test for a car - why is acceleration unlikely to be uniform
Answer: gear changes
●●
Answer:
●●
Answer:
●● why a skii jumper would need a larger velocity than calculated
Answer: The jumper is affected by air resistance [1] The position and
shape of the body relative to the skis affects the trajectory of the jump.
, ●● how a ball's trajectory is affected by spin
Answer: The effect of air resistance [1] will mean that the range of the
ball will be reduced. A ball with back-spin will also swerve upwards,
increasing the height of the shot and further reducing its length.
●● momentum
Answer: vector since velocity is a vector - p=mv
●● since momentum has both size and direction...
Answer: it can have a negative value if the object is travelling in the
opposite direction to its initial direction
●● the principle of conservation of momentum
Answer: in any interaction between two bodies, linear momentum is
conserved, provided that no resultant force acts on the bodies
●● newton's second law of motion... (momentum)
Answer: the resultant force exerted on a body is directly proportional to
the rate of change of linear momentum of the body
●● impulse
Answer: force x time = change in momentum
