A manufacturer claims a rubber luggage strap is more suitable than a steel spring for repeated stretching under load. A fair comparison must use the same maximum applied force and check whether each sample returns to its original length.
Plan an investigation to compare how extension depends on force for the strap and spring, and test whether they recover their original lengths after repeated loading.
[6 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A lifting device measures the weight of several masses on a planet. Results are 6 N for 2 kg, 15 N for 5 kg and 24 N for 8 kg. Measurements pass through the origin on a weight-mass graph.
01234567891051015202530Mass (kg)Weight (N)
.1
Calculate the gravitational field strength on the planet.
[2 marks]
.2
Calculate the mass of an object that weighs 42 N there.
[2 marks]
.3
Explain why using several masses supports the result more than using one reading.
[2 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student builds a circuit with a 9.0 V supply, a 10 Ω resistor and a 20 Ω resistor in series. The ammeter reads 0.30 A. The student writes: “The 20 Ω resistor uses twice as much current as the 10 Ω resistor.”
.1
Calculate the potential difference across the 10 Ω resistor.
[2 marks]
.2
Evaluate the statement using current conservation and energy transfer.
[3 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A parachutist has reached a first terminal velocity before opening a parachute. Consider the motion from just before opening until a new terminal velocity is reached.
Explain the changes in resultant force, acceleration and speed throughout this sequence.
[6 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student measures the resistance of 0.20 m, 0.40 m and 0.60 m of one uniform wire. Values are 1.6 Ω, 3.2 Ω and 5.6 Ω. The 0.60 m measurement is made after current has flowed for several minutes.
.1
Use the first two results to calculate the expected resistance of 0.60 m of wire at the original temperature.
[2 marks]
.2
Evaluate the final result and suggest how to improve the investigation.
