Which of these would be a typical speed for a racing cyclist travelling down a steep straight slope?
A 0.2 m/s
B 2 m/s
C 20 m/s
D 200 m/s
A cyclist travels down a slope - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1
Question 4
Which of these would be a typical speed for a racing cyclist travelling down a steep straight slope?
A 0.2 m/s
B 2 m/s
C 20 m/s
D 200 m/s
A cyclist travels down... show full transcript
Worked Solution & Example Answer:Which of these would be a typical speed for a racing cyclist travelling down a steep straight slope?
A 0.2 m/s
B 2 m/s
C 20 m/s
D 200 m/s
A cyclist travels down a slope - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1
Step 1
Which of these would be a typical speed for a racing cyclist travelling down a steep straight slope?
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Answer
A typical speed for a racing cyclist would be C, 20 m/s, as it is realistic for competitive cycling.
Step 2
Calculate the change in gravitational potential energy of the cyclist between the top and the bottom of the slope.
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Answer
To calculate the change in gravitational potential energy (GPE), we use the formula:
GPE=mimesgimesh
where:
m is the mass of the cyclist (75 kg),
g is the gravitational field strength (10 N/kg),
h is the height of the slope (20 m).
Substituting the values:
GPE=75imes10imes20=15000extJ
Step 3
Calculate the distance, x, travelled by the aircraft while it is accelerating.
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Answer
Using the equation:
x=2av2−u2
where:
v = 80 m/s,
u = 0 m/s,
a = 4 m/s².
Substituting the values:
x=2×4(80)2−(0)2=86400=800extm
Step 4
One piece of apparatus is missing from the diagram.
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Answer
The extra piece of apparatus needed to determine the average speed is a stopwatch.
Step 5
Describe how the student can make the trolley accelerate along the bench.
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Answer
The student can make the trolley accelerate by adding a weight to one end of the string attached to the trolley. This weight will pull the trolley down the slope of the bench due to gravity.
Step 6
State one other measurement that the student must make to determine the acceleration of the trolley.
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Answer
The student must measure the time taken for the trolley to travel a known distance.
