Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
171–180 of 181 · Normal
Question 171
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 172
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 173
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.
Question 174
6 marks · Normal
Answer and see the solution →A cyclist travels along a straight road and then up a hill. The cyclist's motion is monitored using different methods. Use the data and diagrams to answer the questions.
(a)[2 marks]State the SI units for mass, distance, average speed, and force.
(b)[2 marks]The cyclist covers 1500 m in 300 s. Calculate the cyclist's average speed in m/s.
(c)[2 marks]Explain whether the cyclist's speed and velocity are always the same during the journey.
Question 175
1 mark · Normal
Answer and check →Which of the following is a vector quantity?
- A.Distance
- B.Speed
- C.Displacement
- D.Time
Question 176
6 marks · Normal
Answer and see the solution →A car travels along a straight section of road. It accelerates from 10 m/s to 26 m/s in 4.0 s.
(a)[2 marks]Calculate the acceleration of the car.
(b)[2 marks]Calculate the distance travelled during the acceleration.
(c)[2 marks]Explain one reason why the driver needs to allow extra stopping distance if the road is wet.
Question 177
5 marks · Normal
Answer and see the solution →A trolley of mass 1.5 kg is pulled along a straight track by a constant force. The trolley accelerates from rest to a velocity of 2.8 m/s in 4.0 s. A student draws the velocity–time graph below for the motion:
Velocity–time graph for trolley (a)[2 marks]Calculate the acceleration of the trolley.
(b)[2 marks]Calculate the resultant (unbalanced) force on the trolley.
(c)[1 mark]State two differences between the information shown on a velocity–time graph and a distance–time graph.
Question 178
6 marks · Normal
Answer and see the solution →A lorry of mass 2000 kg accelerates uniformly from rest to a speed of 15 m/s in 10 s on a straight, level road. The lorry then continues at this speed for another 10 s.
(a)[2 marks]Calculate the average acceleration of the lorry during the first 10 s.
(b)[2 marks]Calculate the resultant force on the lorry during the first 10 s.
(c)[2 marks]Sketch a velocity–time graph for the motion of the lorry for the 20 s described. Label all relevant values on the axes.
Question 179
6 marks · Normal
Answer and see the solution →A van of mass 1200 kg is moving along a straight road. The driver notices a traffic jam ahead and comes to rest by applying the brakes. The van slows from 18 m/s to 0 m/s in 4.5 s.
(a)[1 mark]State the SI unit for acceleration.
(b)[2 marks]Calculate the acceleration of the van while braking. State whether this acceleration is positive or negative.
(c)[2 marks]Calculate the unbalanced (resultant) force acting on the van while braking.
(d)[1 mark]Explain why the van takes a longer distance to stop if the road is wet.
Question 180
6 marks · Normal
Answer and see the solution →You investigate how the extension of a metal spring varies with the force applied. The table shows your results.
Results from spring experiment Force/N Extension/cm 0.0 0.0 2.0 1.5 4.0 3.0 6.0 4.5 8.0 6.0 (a)[1 mark]State the SI unit for extension in this experiment.
(b)[2 marks]Plot a graph of force (vertical axis) against extension (horizontal axis). Draw the best-fit straight line and label axes with correct units.
(c)[2 marks]Explain why the graph is a straight line that passes through the origin.
(d)[1 mark]Describe what will happen if the force applied is increased well beyond 8.0 N.