Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Forces and Motion
367 practice questions
Topics covered
Practice questions
351–360 of 367
Question 351
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 352
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 353
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 354
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 355
5 marks · Easy
Answer and see the solution →A cyclist rides a bike along a straight road. At one point, the cyclist stops at a traffic light for 20 s, then cycles away at a steady speed for the next 60 s.
(a)[2 marks]Complete the table to show which of the following are scalar and which are vector quantities: speed, displacement, time, velocity.
Scalar or vector: Quantity Type (Scalar or Vector) Speed Displacement Time Velocity (b)[1 mark]State the SI units for (i) speed and (ii) time.
(c)[2 marks]Explain the difference between speed and velocity.
Question 356
4 marks · Easy
Answer and see the solution →A force of 10 N is applied to a box of mass 2 kg, causing it to slide across a smooth surface.
(a)[1 mark]State the formula linking force, mass, and acceleration.
(b)[2 marks]Calculate the acceleration of the box.
(c)[1 mark]What is the SI unit for force?
Question 357
5 marks · Easy
Answer and see the solution →A cart is pushed along a straight path. The following data was recorded:
(a)[2 marks]Write down the SI units for (i) speed and (ii) acceleration.
(b)[2 marks]The cart moves a distance of 8 m in 4 s at a constant speed. Calculate its speed.
(c)[1 mark]If the mass of the cart is 2 kg, what is its momentum at this speed?
Question 358
4 marks · Easy
Answer and see the solution →A small mass is released from rest and falls freely under gravity. The mass is 0.30 kg. (Assume air resistance is negligible and g = 10 N/kg.)
(a)[1 mark]State the unit of weight in the SI system.
(b)[2 marks]Calculate the weight of the mass.
(c)[1 mark]Explain why the velocity of the mass increases as it falls.
Question 359
2 marks · Easy
Answer and check →Which of the following is NOT a unit of momentum?
- A.kg m/s
- B.N
- C.g cm/s
- D.kg km/h
Question 360
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.