Physics Challenge 10

Which is the unit for Impulse ?

• Nkg^-1

• Nm

• Nms^-1

• Ns

Which graph shows T² is inversely proportional to k?

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Diagram 2 shows Ahmad is pulling a box of mass 50 kg on a rough inclined surface.

The box moves with an acceleration 2 ms^-2.

Which pair of forces is correct?

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Diagram 3 shows Hafiz’s new car.

The car will have the largest momentum if Hafiz drives with speed of

• 80 kmh^-1

• 120 kmh^-1

• 150 kmh^-1

• 200 kmh^-1

Diagram 4 shows Anis is launching a ball using a slingshot.

Which method and characteristic of slingshot will cause the ball to move the furthest distance?

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Diagram 5 shows a car moves with constant velocity.

The forces are balanced when

• net force is zero

• net force is equal

• net force is equal to frictional force

• net force is less than frictional force

Diagram 6 shows Pak Sani is pushing a horse-cart filled with load of mass 1000 kg. The horse is pulling the cart with force 500 N and Pak Sani is pushing the cart with force 200 N.

What is the work done when the horse-cart moves a distance of 8.0 m?

• 8.75 x 10¹Nm

• 2.40 x 10³Nm

• 5.60 x 10³Nm

• 8.00 x 10³Nm

Diagram 7 shows a rice mortar is used to produce rice. The dried paddy was pound with pestle to separate the rice from the husk.

Which statement shows impulsive force is produced

• the pestle is moved at high velocity.

• the pestle is lifted at high level

• the rice is separated from husk

• the pestle hits the mortar

Diagram 8 shows a ball bounces upward when a force acted on a compressed spring is released.

Which pair of energy transformation and magnitude of energy is correct?

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The pressure of liquid at the bottom of a jug depends on the following factors except

• shape of the jug

• depth of liquid

• the density of liquid

• gravitational field strength