Physics Challenge 1

Hamid cycles at a velocity of 3.1 km h^-1.

What is this velocity, in m s^-1?

• 0.09

• 0.86

• 1.16

• 11.61

Diagram below shows the velocity-time graph of an object.

Which accelaration-time graph represents the same motion as the object?

• 
• 
• 
• 

F_1, F₂ and F₃are forces with the same magnitude acting on a wooden block.

Which diagram shows the maximum resultant force acting on the wooden block?

• 
• 
• 
• 

The forces are in equilibrium in all the phenomena below except

• a car descending a hill at constant velocity

• lamp hanging at rest in a hall

• a mango falling from a tree

• A ship floating at rest in the sea

Diagram below shows a stroboscopic photograph of a ball dropped from a height.

Which physics quantity remains constant as the ball falls?

• Velocity

• Momentum

• Acceleration

• Kinetic energy

Diagram below shows a durian and a coconut of the same mass placed in two identical plastic bags.

• The surface area of the durian that is in

  contact with the plastic bag is larger

• The force exerted by the durian on the plastic

  bag is larger

• The pressure exerted by the durian on the

  plastic bag is larger

• The volume of the durian is larger

Diagram below shows two identical containers containing liquid P and liquid Q.

When the height of liquid P is 15 cm and the height of liquid Q is 20 cm, water spurt is the same.

The density of liquid P is 2.0 g cm^-3

What is the density of liquid Q?

• 0.67 g cm^-3

• 1.30 g cm^-3

• 1.50 g cm^-3

• 2.70 g cm^-3

Diagram below shows a hydraulic brake system.

A driver steps on the brake pedal.

Which relationship is correct?

• Pressure on P < Pressure on Q

• Pressure on P = Pressure on Q

• Pressure of P > Pressure on Q

Diagram below shows the water piping system of a house.

What is the water pressure in the tap?

[Density of water = 1 000 kg m^-3and atmospheric pressure = 1.0 × 10⁵Pa]

• 8.0 × 10³Pa

• 5.8 × 10⁴Pa

• 1.08 × 10⁵Pa

• 1.57 × 10⁵Pa

Diagram below shows the roof of a house being lifted by strong winds.

Which explains the above phenomenon?

• Pascal’s Principle

• Bernoulli’sPrinciple

• Archimedes’ Principle

• Newton’s First Law