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.
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 corre... 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
Draw lines to the descriptions of the motion
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Answer
The correct lines are:
P: the car is standing still
Q: the car is accelerating
R: the car is decelerating
S: the car is travelling at constant speed
Step 2
State the parts where forces are balanced
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Answer
The letters are Q and S.
Step 3
Calculate the distance travelled by the car in part Q
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Answer
To calculate the distance travelled by the car in part Q, use the formula:
distance travelled = average speed × time
We see from the graph that the average speed in part Q is 30 m/s and the time taken is 100 s.
Therefore, the calculation is:
distance travelled = 30 m/s × 100 s = 3000 m.
Step 4
Calculate the force used to accelerate the car
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Answer
To calculate the force used to accelerate the car, use the formula:
force = mass × acceleration
Here, the mass of the car is 1800 kg and the acceleration is 1.2 m/s².
