Physics Challenge 15

Which pair of physics quantity and SI unit is correct?

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Diagram 2 shows a velocity-time graph. The gradient of the graph represent the acceleration.

Which quantity is the manipulated variable?

• Time

• Velocity

• Acceleration

The volume of a liquid in a container is 2.5 cm³.

What is the volume of the liquid, in m³?

• 2.5 x l0^-2

• 2.5 x 10^-6

• 2.5 x 10²

• 2.5 x 10⁶

A car travels at a velocity of 84.6kmh^-l.

What is its velocity in ms^-1?

• 11.8

• 23.5

• 84.7

• 304.8

Which graph shows that F is inversely proportional to X?

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Diagram 3 shows a load suspended on a spring oscillating in water.

Which displacement-time graph describes the motion of the load?

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Which situation shows forces are in equilibrium?

• A car speeding up on a highway

• A boat moving with uniform velocity

• An aeroplane take-off on a runway

• A cyclist slowing down his bicycle

Diagram 5 shows a tractor on a muddy ground.

Why does the tractor has big and wide tyres?

• To reduce the pressure on the ground

• To support the weight of the tractor

• To produce a strong grip on the ground

• To avoid the tractor from skidding

Diagram 6 shows three identical springs with the original length of 16.0 cm.

What is the length of Y?

• 2.0 cm

• 6.0 cm

• l0.0cm

• 13.0cm

Diagram 7 shows force F₁ exerted on a small piston producing pressure P_1. Pressure P₁is transferred to the large piston to produce pressure P₂ and force F₂.

Which comparison is correct?

• F₁= F₂

• F₁> F₂

• P₁= P₂

• P₁= >P₂