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GCSE Questions - Forces

Q31. Four students run in different races.

Student
Race distance /m
Time /s
Andy
50
6
Bobby
100
15
Charlie
100
14
Davy
200
31

 

Use the information in the table to describe and compare the motion of the four students.

(Total 6 marks)

This type of question is marked in two ways:

- the examiner looks for relevant points

- but also for a logical sequence...

It is not just a 'tick fest' - but a marker does look to see how many relevant points you have made, then considers how you have strung them together to put your answer into a 'level'

Level 3:

Detailed description and comparison of the motion of all four students in terms of distance and time relating speed to distance run

AND

Calculates the speed of all four students.

There is a well-developed line of reasoning which is clear and logically structured.

The information presented is relevant and substantiated.

5 - 6 marks
Level 2:

Description and comparison of the motion of three students of distance and time

OR

Calculates the speed of at least three students.

There is a line of reasoning presented with some structure.

The information presented is relevant and supported by some evidence.

3 - 4 marks
Level 1:

Brief description of the motion of at least three students.

OR

Calculates the speed of at least one student.

There is an attempt at a logical structure with a line of reasoning.

The information is in the most part relevant.
1 - 2 marks
Level 0:

No response or no response worthy of credit.

0 marks

 

Examples of physics points that should be made in the response:

Apply knowledge and understanding of the motion of the four students

- Bobby's race is a longer distance than Andy's

- Bobby and Charlie's races are the same distance

- Bobby and Charlie take different amounts of time to run the same distance

- Davy takes the longest time

- Davy runs the longest distance

- Andy runs the shortest distance

Demonstrate knowledge and understanding of speed = distance ÷ time

- Andy's speed = 15 ÷ 6 = 8.3m/s

- Bobby's speed = 100 ÷ 15 = 6.7m/s

- Charlie's speed = 100 ÷ 14 = 7.1m/s

- Davy's speed = 200 ÷ 31 = 6.5m/s

Analyse information to interpret and draw conclusions about the motion of the four students

- Bobby's race is twice the length of Andy's, but the time he takes is more than twice that of Andy

- Charlie is faster than Bobby as the time is shorter (for the same distance)

- As race length increases, average speed decreases