A trolley experiment uses a total moving mass of 0.80 kg. Resultant forces 0.40 N, 0.80 N and 1.20 N produce accelerations 0.50, 1.00 and 1.50 m/s².
.1
Calculate the acceleration predicted for a 1.60 N resultant force.
[2 marks]
.2
Evaluate whether the data support the proposed relationship, and identify one way to make the conclusion more reliable.
[3 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
At fixed potential difference 3.0 V, a thermistor carries 0.0020 A in cool water and 0.0060 A in warm water. It is the type whose resistance falls as temperature rises.
.1
Calculate the resistance in cool water.
[2 marks]
.2
Calculate the resistance in warm water.
[2 marks]
.3
A pupil says the current tripled because the supply voltage tripled. Evaluate the statement using the data.
[2 marks]
4 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A force-extension graph is straight from the origin to force 5.0 N and extension 0.040 m. A student says the work done stretching the spring equals 5.0×0.040 J.
.1
Calculate the energy actually stored in the spring.
[2 marks]
.2
Explain the error in the student's reasoning.
[2 marks]
4 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A wire carries 4.0 A perpendicular to a 0.20 T magnetic field. The length in the field is 0.10 m. In a second test both the current and the field direction are reversed, but their magnitudes are unchanged.
.1
Calculate the magnetic force magnitude in the second test.
[2 marks]
.2
Explain whether the force direction changes in the second test.
[2 marks]
5 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A passenger stands in a bus moving at constant velocity. The bus brakes suddenly. The passenger is not holding a support.
.1
Explain why the passenger initially moves forwards relative to the bus.
[3 marks]
.2
A safety rail exerts a mean horizontal force of 180 N on a 60 kg passenger. Calculate the magnitude of the passenger's acceleration.
