Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
221–230 of 367
Question 221
4 marks · Normal
Answer and see the solution →A student investigates how extension varies with force for a metal wire. Their setup uses a half-metre rule, clamp stand, and a set square to improve measurement accuracy.
(a)[2 marks]Describe two ways the student can ensure the measurements of the wire's extension are accurate in this investigation.
(b)[2 marks]Explain why the spring or wire should not be stretched beyond its elastic limit during this experiment.
Question 222
2 marks · Normal
Answer and see the solution →A spring has an original length of 14.6 cm. When a force of 3.5 N is applied, the length of the spring increases to 16.1 cm. Calculate the extension of the spring produced by the force. Give your answer in centimetres.
Question 223
2 marks · Normal
Answer and see the solution →Explain what is meant by the elastic behaviour of a material. Give an example of when this property is useful in everyday life.
Question 224
1 mark · Normal
Answer and check →Which statement best describes the force-extension graph for a metal spring obeying Hooke’s law?
- A.It is a horizontal line.
- B.It is a straight line passing through the origin.
- C.It is a curve that increases at higher forces.
- D.It is a straight line that does not pass through the origin.
Question 225
5 marks · Hard
Answer and see the solution →A student is testing the behaviour of a metal wire using the setup below. She measures its original length as 80.0 cm. She applies a series of increasing forces and records the following lengths:
Force / N Length / cm 0 80.0 2 80.4 4 80.8 6 81.2 8 81.6 10 82.8 (a)[2 marks]Calculate the extension produced by each applied force, entering your answers in cm.
(b)[3 marks]Identify between which two forces the wire most likely stops obeying Hooke’s law, and justify your answer using the data.
Question 226
5 marks · Hard
Answer and see the solution →A designer is choosing materials for a chair. The seat uses metal springs under a cushion, while the backrest is made of a plastic sheet. Both materials can be squashed or stretched slightly when someone sits on the chair.
(a)[3 marks]Explain why using springs with elastic behaviour is suitable for the seat, but the plastic sheet is less suitable if elastic behaviour is required for comfort.
(b)[2 marks]State one reason why it is important for the springs to return to their original shape after the load is removed.
Question 227
1 mark · Easy
Answer and see the solution →State the equation linking force, mass, and acceleration. Include the correct scientific symbols.
Question 228
3 marks · Easy
Answer and see the solution →A child pushes a toy lorry of mass 4.0 kg along a smooth surface. The lorry accelerates at 1.2 m/s².
Calculate the size of the unbalanced force acting on the lorry. Show your working.
Question 229
2 marks · Easy
Answer and see the solution →Explain, using the equation F = m × a, what happens to the acceleration of an object if its mass is doubled while the force remains the same.
Question 230
2 marks · Easy
Answer and see the solution →An electric scooter of mass 12 kg is acted on by a resultant force of 18 N.
Calculate the acceleration of the scooter. Give your answer to 2 decimal places.