A ‘tennis trainer’ consists of a tennis ball suspended by a string from the top of a
vertical pole. When the ball is hit it travels in a horizontal circle around the pole,
as shown in both the photograph and the diagram.
string
vertical pole
Question
Physics
Edexcel2022
2 m
tennis ball
The radius of the path of the ball is 1.2 m and the speed of the ball is 3.8 m s−1.
Deduce whether these values are consistent with the angle between the string and the
vertical pole shown in the photograph.
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(Total for Question 13 = 5 marks)
Question
Physics
Edexcel2021
The International Space Station (ISS) orbits the Earth with a constant speed v. The orbit
is circular and of radius r.
(a) The diagram represents two positions, A and B, of ISS during its orbit.
v
A
B
r
Draw a labelled vector diagram, in the space below, of the velocities at the two positions
that shows the acceleration is directed towards the centre of the orbit.
(2)
Question
Physics
Edexcel2021
RC
a = rω2
t
ln V = ln V −
Question
Physics
Edexcel2020
The photograph shows a model racing car set. The curved parts of the track are
semicircular. The car makes electrical contact with the track using metal brushes
underneath the car.
(a) There is a maximum speed for the car to stay on the curved part of the track.
Explain why the car will slip off the curved part of the track if the car exceeds the
maximum speed.
(3)
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(b) The following measurements are made for a car starting at rest on a straight piece
of track.
distance travelled = 1.2 m
time taken = 0.77 s
(i) Show that the final velocity of the car is about 3 m s−1.
Assume the acceleration is constant.
(2)
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Question
Physics
Edexcel2020
*P61864RA01128*
Turn over
PMT
(ii) The final velocity calculated in (b)(i) is the maximum velocity before the car slips
off the track.
Calculate the maximum horizontal force between the curved part of the track and
the car.
mass of car = 0.050 kg
radius of curved part of track = 0.042 m
(2)
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Maximum horizontal force =
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(c) The cars are controlled separately and so can be raced, with one car on the inner
lane and the other on the outer lane. The cars are identical. Each car is raced at its
highest speed for that lane.
Explain why the outcome of the race is difficult to predict.
(3)
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(Total for Question 13 = 10 marks)