Y1 Mechanics, 2022,2019,2024

2022

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2019

Explain why the work done on the cable when its extension changes from 3.0 mm to 4.0 mm is greater than when its extension changes from 1.0 mm to 2.0 mm

Greater area under the graph (from 3 mm to 4 mm)

work done = average force × distance

or work done = area under graph

Force is greater at longer extensions therefore more work is done.

2019

The student now adds a small amount of sand inside the hollow ball.

As before, the ball is dropped from rest and it also reaches terminal velocity before it reaches

the ground.

(i) Describe how the forces acting on the sand-filled ball at v = 0.50 m s–1 compare with the forces acting on the hollow ball at this speed.

Drag is the same (at a certain velocity)

weight is greater or resultant force is larger

2019

Explain why the terminal velocity of the sand-filled ball will be greater than the terminal velocity of the hollow ball.

(TV requires) weight = drag and weight is greater

greater speed gives greater drag, they’re directly proportional.

2019

Different types of energy are involved in the oscillations of this mass-spring system.

Describe the energy changes that will take place as the mass moves from the lowest point in

its motion through the equilibrium position to the highest point in its motion.

EPE decreases (from bottom to top)

GPE increases (from bottom to top)

KE starts at zero, finishes at zero and max at equilibrium point.

Air gains thermal energy / Total energy (of mass and

spring) decreases over time

2022;

The diameter of a wire is measured in five different places along its length.

The results are shown below.

1.92 mm 1.88 mm 1.90 mm 1.86 mm 1.89 mm

What is the absolute uncertainty in the diameter of this wire?

0.01 mm

2019

A solid cylindrical glass rod has length 20.0 ± 0.1 cm and diameter 5.00 ± 0.01 mm.

What is the percentage uncertainty in the calculated volume of this rod?

0.1%

2024

kg m2 s–2 K–1

2024

Maximum speed occurs when resultant force is 0N.

Resistive forces increase with speed

2024

2024

Changes are made to the engine of the car so that it can produce double the original maximum power.

Explain why the maximum speed of the modified car is not doubled, using the equation P= kv³

2024

A model of an aircraft is being tested in a wind tunnel. The model is fixed in position by a support,

and air is blown horizontally towards it by fans.

In one second, 35 kg of air moving at 50 m s–1 hits the model. After flowing around the model,

the airflow is diverted downwards at an angle of 30° to the horizontal. The speed of the diverted

airflow remains at 50 m s–1.

Calculate the vertical lift force F acting on the model due to the airflow around it.

2024

What does the area between unloading and loading of the chord show, and to its planned use?

energy dissipated as thermal energy.

Less energy is returned back to the object therefore it bounces less