Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
71–80 of 367
Question 71
2 marks · Normal
Answer and see the solution →Explain why it is important to use SI units such as kilogram, metre, and second when carrying out calculations in Physics.
Question 72
1 mark · Normal
Answer and check →Which one of the following is the correct SI unit and symbol for the quantity: newton metre?
- A.joule (J)
- B.kilogram metre per second (kg m/s)
- C.newton metre (Nm)
- D.metre per second squared (m/s^2)
Question 73
3 marks · Hard
Answer and see the solution →The diagram below shows the results of an experiment to measure the movement of a toy truck.
Experiment data: Movement of toy truck Distance travelled (cm) Time taken (ms) 120 400 85 280 (a)[2 marks]Convert the distances and times for both runs to SI base units, giving your answers as decimals with the correct units and symbols.
(b)[1 mark]State the SI base unit and symbol for length and for time.
Question 74
2 marks · Hard
Answer and see the solution →A physics textbook lists a unit as "newton per kilogram". Describe a physical situation where this unit might be used, and write down its symbol. Do not use gravitational field strength as your answer.
Question 75
1 mark · Hard
Answer and check →Which of these quantities is measured in the SI unit newton metre (N m)?
- A.Power
- B.Energy
- C.Moment of a force
- D.Momentum
Question 76
3 marks · Hard
Answer and see the solution →A laboratory uses special scales that output mass readings in grams (g). An object on such a scale measures 6350 g.
(a)[1 mark]Convert this mass into kilograms, giving the correct unit and symbol.
(b)[2 marks]If the object exerts a weight of exactly 62.3 N on the scales, calculate the local gravitational field strength in N/kg (give your answer to 2 decimal places, including the correct unit and symbol).
Question 77
2 marks · Hard
Answer and see the solution →Write the correct SI unit and symbol for acceleration. Then, using SI units, explain what the symbol 'm/s²' means in words.
Question 78
3 marks · Hard
Answer and see the solution →A scientist measures a force of 57 millinewtons (mN) using a digital force meter.
(a)[1 mark]Convert this force reading into newtons (N), using the correct unit symbol.
(b)[2 marks]If this force is applied to an object with a mass of 70 grams, calculate the acceleration produced (to 2 decimal places). Write your answer with the correct SI units.
Question 79
1 mark · Hard
Answer and check →Momentum is measured in which SI unit and symbol?
- A.kilogram metre per second (kg m/s)
- B.newton per second (N/s)
- C.metre per second (m/s)
- D.joule per second (J/s)
Question 80
2 marks · Hard
Answer and see the solution →Write the SI unit and symbol for each of the following: (i) distance, (ii) time, (iii) mass, (iv) force, (v) acceleration, (vi) momentum, and (vii) moment of a force.