Chapter 1 - Movement and Position

Question 1

What is the equation linking stopping distance, thinking distance and braking distance (1)

Answer 1

Stopping = Thinking distance + braking distance

Question 2

Describe the patterns shown in the graph (2)

Answer 2

• As speed increases, the stopping/braking/thinking distance increases
• Increase in thinking distance is proportional

Question 3

Use the graph to estimate the stopping distance for a car travelling at 35 miles per hour (1)

Stopping distance = ………….m

Answer 3

30m

Question 4

To find the minimum stopping distance, several cars were tested.

Suggest how the data from the cars should be used to give the values in the graph (1)

Answer 4

Use the minimum/lowest values obtained

Question 5

If the road is icy, describe and explain what change there would be to the thinking distance (2)

Answer 5

• No change in thinking distance
• Depends on speed/driver/reaction time

Question 6

If the road is icy, describe and explain what change there would be to the braking distance (2)

Answer 6

• Increase in braking distance
• Less friction/less grip

Question 7

acceleration =

Answer 7

final - initial velocity / time

Question 8

Final velocity = 78 m/s

Initial velocity = 0 m/s

Time = 1 minute

Find the average acceleration (m/s²) [3 marks]

Answer 8

Final - initial velocity / time

78 - 0 / 1 x 60

78 / 60

= 1.3 (m/s²)

Question 9

Explain why acceleration is not constant, even though the engines produce a constant force [3 marks]

Answer 9

• Air resistance (when moving);
• Increases as velocity / speed increases
• Reducing resultant force

Question 10

Answer 10

• Weight of toy car
• Speed of toy car

Question 11

State two factors that the student should keep constant in his investigation (2)

Answer 11

• angle/gradient/incline/steepness/height of slope;
• same car/eq;
• surface of slope;
• force at launch;
• initial speed;
• starting height/position/point (of car);
• distance travelled/length of slope;

Question 12

Toy car experiment

Answer 12

Newtonmeter, ruler, stopwatch

Question 13

Describe what the student should do to test his prediction that the more weight the toy car has, the faster it will roll down the slope.

(5)

Answer 13

• measure weight/mass;
• measure distance (down slope)/start from same point;
• measure time/speed (with light gate);
• equation seen or described in words: speed = distance / time;
• idea that different weights used;
• repeat experiment AND average/remove anomalies;
• method to improve accuracy, e.g. use of light gates, reaction time considered;