AQA GCSE PHYSICS · PAPER 2 · FOUNDATION & HIGHER
Exam Practice: Gravity, mass and weight
Gravity, mass and weight · Forces · Lesson 2 of 20 · 14 marks · 15 minutes
|
Name |
|
Date |
|
Instructions
• Answer all the questions.
• Write your answers in the spaces provided.
• The marks for each question are shown in brackets - use this as a guide to how much to write.
• The answers are on separate pages at the back. Attempt every question before you look at them.
• Answer all questions. Use the mark allocation as a guide to how much to write.
Question 1 CALCULATE (2 marks)
A person has a mass of 60 kg. Gravitational field strength = 9.8 N/kg. Calculate the weight of the person. Use the equation: weight = mass × gravitational field strength
|
|
|
|
|
|
(Total for Question 1 = 2 marks)
Question 2 EXPLAIN (3 marks)
An astronaut travels from Earth to the Moon. Explain what happens to the astronaut's mass and weight.
|
|
|
|
|
|
|
|
(Total for Question 2 = 3 marks)
Question 3 USE THE GRAPH (4 marks)
The graph shows how the weight of objects on a planet depends on their mass. (a) Describe the relationship between weight and mass. (b) Use the graph to calculate the gravitational field strength of the planet.
|
|
|
|
|
|
|
|
|
|
|
|
(Total for Question 3 = 4 marks)
Question 4 CALCULATE (3 marks)
A rock has a weight of 12 N on a planet. Its mass is 3.0 kg. Calculate the gravitational field strength of the planet.
|
|
|
|
|
|
|
|
(Total for Question 4 = 3 marks)
Question 5 EXPLAIN (2 marks)
A newtonmeter is used to measure the weight of an object. State what the newtonmeter actually measures and the unit used.
|
|
|
|
|
|
(Total for Question 5 = 2 marks)
TOTAL FOR PAPER = 14 MARKS
|
|
Answers and mark scheme
Check your answer only once you have written one.
Question 1 (2 marks)
60 × 9.8 = 588 N
• Correct substitution 1 mark
• 588 N 1 mark
Question 2 (3 marks)
The mass stays the same because it is the amount of matter. The weight decreases because the gravitational field strength on the Moon is less than on Earth.
• Mass unchanged 1 mark
• Weight decreases 1 mark
• Moon has a weaker gravitational field 1 mark
Question 3 (4 marks)
(a) Weight is directly proportional to mass (a straight line through the origin). (b) Gradient = 18.5 ÷ 5.0 = 3.7 N/kg
• Straight line through the origin 1 mark
• Directly proportional 1 mark
• Uses the gradient 1 mark
• 3.7 N/kg (accept 3.5 to 3.9) 1 mark
Question 4 (3 marks)
g = W ÷ m = 12 ÷ 3.0 = 4.0 N/kg
• Rearranges to g = W ÷ m 1 mark
• Correct substitution 1 mark
• 4.0 N/kg 1 mark
Question 5 (2 marks)
The force (weight) acting on the object due to gravity, in newtons.
• Force or weight 1 mark
• In newtons 1 mark