Physics Challenge 16

Which quantity is base quantity?

• Potential difference

• Electric current

• Electric energy

• Electric power

Diagram 1 shows two identical eggs are dropped from the same height, h, onto a floor and a sponge respectively.

Which inference is correct?

• Impulsive force depends on velocity of egg

• lmpulsive force depends on time of impact

• Impulsive force depends on gravitational force

• Impulsive force depends on height of egg

Diagram 2 shows a velocity-time graph for a motion of an object.

What is the displacement of the object?

• 12 m

• 18 m

• 24 m

• 36 m

Diagram 3 shows a cat chasing a rat.

The inertia o fthe cat is bigger than the rat because

• the size of the cat is bigger than the rat

• the mass of the cat is bigger than the rat

• the length of the cat is more than the rat

• the height of the cat is more than the rat

The balanced forces that act on the moving object could make the object

• decelerates

• accelerates

• change the direction of motion

• moves with constant velocity

Which diagram shows the unbalanced forces acting on an object?

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Diagram 4 shows a martial art student breaking a pile of bricks.

What is the physics concept that make the brick break?

• Impulsive force

• Momentum

• Pressure

• Impulse

Diagram 5 shows a stone is thrown vertically upwards at a velocity of 20 m s^-1.

What is the maximum height achieved by the stone?

• 2 m

• 19 m

• 20 m

• 40 m

The force, F, applied to a spring is directly proportional to the spring's extension or compression, x.

The above statement is

• Snell's Law

• Hooke's Law

• Charles' Law

• Newton's Third Law of motion

Pressure is defined as force per unit area.

Which graph represents relationship between pressure (P) and area (A)?

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