Exam (elaborations)
A level physics revision questions and answers
A level physics revision questions and answers
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PMTPaper 1
A level physics revision
questions and answers
, PMT
Do not write
2 outside the
box
Section A
Answer all questions in this section.
0 1 Horizontal escape lanes made of loose gravel have been constructed at the side of
some roads on steep hills so that vehicles can stop safely when their brakes fail.
Figure 1 shows an engineer’s prediction of how the speed of an unpowered vehicle of
mass 1.8 × 104 kg will vary with time as the vehicle comes to rest in an escape lane.
Figure 1
0 1 . 1 Determine the force decelerating the vehicle 2.0 s after entering the escape lane.
[3 marks]
force decelerating the vehicle = N
, PMT
Do not write
3 outside the
box
0 1 . 2 Deduce whether a lane of length 85 m is long enough to stop the vehicle, assuming
that the engineer’s graph is correct.
[3 marks]
0 1 . 3 Discuss the energy transfers that take place when a vehicle is decelerated in an
escape lane.
[2 marks]
Question 1 continues on the next page
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, PMT
Do not write
4 outside the
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0 1 . 4 An alternative to an escape lane containing gravel is an escape lane that consists of a
ramp. An escape ramp is a straight road with a concrete surface that has a constant
upward gradient.
One escape ramp makes an angle of 25° to the horizontal and is 85 m long.
Deduce whether this escape ramp is sufficient to stop the vehicle.
Assume that any frictional forces and air resistance that decelerate the vehicle are
negligible.
[3 marks]
0 1 . 5 Discuss whether an escape lane containing gravel or an escape ramp would provide
the safer experience for the driver of the vehicle as it comes to rest.
[1 mark]
12
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