Figure 1 shows a speed/time graph for a car - Edexcel - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1
Question 1
Figure 1 shows a speed/time graph for a car.
(i) The graph in Figure 1 is divided into four parts, P, Q, R and S.
Draw a line from the letter for each part to the ... show full transcript
Worked Solution & Example Answer:Figure 1 shows a speed/time graph for a car - Edexcel - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1
Step 1
P
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The car is standing still.
Step 2
Q
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The car is accelerating.
Step 3
R
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The car is decelerating.
Step 4
S
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The car is travelling at constant speed.
Step 5
State the letters of the two parts of the graph where the horizontal forces acting on the car are balanced.
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Answer
Q and S
Step 6
Calculate the distance travelled by the car in part Q.
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Answer
To find the distance travelled during part Q, we can use the formula:
distance travelled = average speed × time.
From the graph, the average speed in part Q is approximately 30 m/s and the time taken is 100 seconds.
Thus,
distance travelled = 30 m/s × 100 s = 3000 m.
Step 7
Calculate the force used to accelerate the car.
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Answer
Using the equation:
force = mass × acceleration,
the mass of the car is 1800 kg and the acceleration is 1.2 m/s².
