Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Forces, Movement, Shape, and Momentum
173 practice questions
Topics covered
- FORCES AND SHAPE29 practice questions
- HOOKE'S LAW16 practice questions
- FORCE, MASS AND ACCELERATION18 practice questions
- FRICTION AND BRAKING20 practice questions
- AIR RESISTANCE AND TERMINAL VELOCITY19 practice questions
- MOMENTUM20 practice questions
- NEWTON'S THIRD LAW: ACTION AND REACTION16 practice questions
- THE TURNING EFFECT OF FORCES24 practice questions
Practice questions
81–87 of 87 · Normal
Question 81
3 marks · Normal
Answer and see the solution →A bridge is supported at both ends. A heavy truck stops near the left end of the bridge. Explain, using the principle of moments, how the upward forces at the left and right supports change as the truck moves from the left end to the centre of the bridge.
Question 82
6 marks · Normal
Answer and see the solution →A 2.0 m long uniform beam of mass 8.0 kg is supported at each end. A box of mass 12 kg is placed 1.2 m from one end of the beam.
(a)[2 marks]Calculate the weight of the beam and the weight of the box. Give your answers in newtons (N). (Take .)
(b)[1 mark]Find the total downward force acting on the supports.
(c)[3 marks]Calculate the upward force on the support that is closest to the box. Show your working.
Question 83
5 marks · Normal
Answer and see the solution →A spring has an unstretched length of 7.0 cm. The table below shows how the length of the spring changes as different forces are applied.
Force and length data for a spring Force (N) Length (cm) 0 7.0 2 7.5 4 8.1 6 8.7 8 9.2 (a)[1 mark]Complete the following column to show the extension of the spring for each force.
Force (N) Extension (cm) 0 2 4 6 8 (b)[2 marks]Plot a graph of force (y-axis) against extension (x-axis). (Describe the shape of the graph.)
(c)[2 marks]Does this spring obey Hooke’s law over the range of forces shown? Explain your answer.
Question 84
5 marks · Normal
Answer and see the solution →A 1500 kg car is travelling at 18 m/s when the driver sees a hazard and reacts, then brakes to a stop.
(a)[1 mark]Calculate the momentum of the car before the driver reacts.
(b)[2 marks]If the driver’s reaction time is 0.6 s, calculate the thinking distance (distance travelled during reaction).
(c)[2 marks]After braking, the car stops in 5.0 s. Calculate the average braking force acting on the car (assume constant deceleration).
Question 85
4 marks · Normal
Answer and see the solution →A tennis ball of mass 60 g is dropped from rest. It eventually reaches a constant terminal velocity as it falls through the air.
(a)[1 mark]Calculate the weight of the tennis ball. (Take .)
(b)[2 marks]Describe what happens to the forces acting on the ball as it falls until it reaches terminal velocity.
(c)[1 mark]Explain why the ball continues to move at terminal velocity instead of speeding up.
Question 86
6 marks · Normal
Answer and see the solution →Two students each pull on a rope in opposite directions. Student A pulls with 160 N to the right, Student B pulls with 120 N to the left. The rope is attached to a box of mass 10 kg resting on a rough surface.
(a)[1 mark]Calculate the resultant (unbalanced) force on the box.
(b)[2 marks]Determine the acceleration of the box. (Assume friction is 10 N, acting to the left.)
(c)[2 marks]Draw a vector diagram to show all the horizontal forces acting on the box.
(d)[1 mark]State whether the box moves left, right or remains at rest. Explain why.
Question 87
5 marks · Normal
Answer and see the solution →A cyclist of mass 75 kg is travelling along a road. A 12 N friction force opposes their motion. The cyclist pedals, applying a driving force of 22 N forward.
(a)[1 mark]State the size and direction of the resultant force.
(b)[2 marks]Calculate the acceleration of the cyclist.
(c)[2 marks]Explain what will happen to the cyclist if the driving force is reduced to 12 N.