A vibrating string is observed with a ruler in its plane. Its equilibrium position is at 12.0 cm on the ruler. The highest and lowest positions are 14.4 cm and 9.6 cm.
.1
Calculate the amplitude in metres.
[2 marks]
.2
A pupil says that increasing amplitude necessarily increases frequency. Evaluate the claim.
[2 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Identical detectors at equal distances from two heated plates record infrared signal after the background reading has been subtracted. Both plates have the same area and temperature. Matt black gives 8.4 units and shiny silver gives 2.1 units.
.1
Calculate how many times larger the black-plate signal is.
[2 marks]
.2
Evaluate whether the measurements support using a shiny surface to reduce thermal radiation losses.
[3 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
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]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A car has thinking distance 10 m and braking distance 18 m on a dry road. On a wet road at the same initial speed, its thinking distance is still 10 m and braking distance is 30 m.
.1
Calculate the percentage increase in total stopping distance on the wet road.
[3 marks]
.2
Explain why wet conditions increase braking distance in this comparison.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A solenoid produces a field resembling that of a bar magnet. A compass near end X points away from X with its north-seeking end. The current is then reversed.
.1
Determine the initial polarity of X and its polarity after reversal. Explain the reasoning.
[2 marks]
.2
Compare the field inside a long solenoid with its field near an open end.
