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 correct description of the motion during that part. One line has been drawn for you. part description of the motion P the car is standing still Q the car is accelerating R the car is decelerating S the car is travelling at constant speed In two parts of the graph in Figure 1 the forces are balanced. State the letters of the two parts of the graph where the horizontal forces acting on the car are balanced. part _____________ and part _____________ Calculate the distance travelled by the car in part Q. Use the equation distance travelled = average speed × time A car with a mass of 1800 kg is accelerating at 1.2 m/s². Calculate the force used to accelerate the car. Use the equation force = mass × acceleration.

GCSE Edexcel Physics Combined Science Speed: Figure 1 shows a speed/time grap

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 corr... 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 The car is standing still

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Answer

P correlates to the statement that 'the car is standing still' since the line is horizontal on the speed/time graph.

Step 2

Q The car is accelerating

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Answer

Q correlates to 'the car is accelerating.' During this interval, the speed of the car is increasing.

Step 3

R The car is decelerating

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R correlates to 'the car is decelerating.' Here, the speed of the car is decreasing.

Step 4

S The car is travelling at constant speed

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S corresponds to 'the car is travelling at constant speed.' The speed remains unchanged during this part.

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

The horizontal forces are balanced during parts S and P.

Step 6

Calculate the distance travelled by the car in part Q.

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To calculate the distance travelled by the car in part Q, we use the equation:

distance travelled = average speed × time.

From the graph, the average speed during part Q is 30 m/s and the time taken is 100 seconds:

distance travelled = 30 , \text{m/s} \times 100 , \text{s} = 3000 , \text{m}.

Step 7

Calculate the force used to accelerate the car.

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Answer

Using the formula:

force = mass × acceleration,

we substitute the mass of the car (1800 kg) and the acceleration (1.2 m/s²):

force = 1800 , \text{kg} \times 1.2 , \text{m/s}^2 = 2160 , \text{N}.

Figure 1 shows a speed/time graph for a car - Edexcel - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1

Worked Solution & Example Answer:Figure 1 shows a speed/time graph for a car - Edexcel - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1

P The car is standing still

Q The car is accelerating

R The car is decelerating

S The car is travelling at constant speed

State the letters of the two parts of the graph where the horizontal forces acting on the car are balanced.

Calculate the distance travelled by the car in part Q.

Calculate the force used to accelerate the car.

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