Physics Revision Ver. 4

In order to determine the period of a pendulum, a student times one complete swing of the

pendulum using an analogue stop-watch with a second hand.

Which change of method produces the greatest improvement in accuracy?

• asking a friend with a shorter reaction time to take the measurement

• measuring the time for 100 swings of the pendulum and dividing it by 100

• measuring the time for a half swing of the pendulum and doubling it

• using a digital timer

The graph shows the speed of a car travelling through a town.

Which section of the graph represents a period when the car is decelerating?

• A

• B

• C

• D

An object weighs 19 N on a planet where the acceleration of free fall is 3.8 m / s2.

What is the mass of the object?

• 0.20 kg

• 1.9 kg

• 5.0 kg

• 72 kg

An object is suspended from a spring balance on the Earth. The same object is suspended from

the same spring balance on another planet. Which statement explains the difference between the two readings?

• Both the mass and the weight of the object are greater on the other planet.

• The mass of the object is greater on the other planet than on the Earth, but the weight is

  unchanged.

• The spring stretches more easily when on the other planet.

• The weight of the object is greater on the other planet than on the Earth, but the mass is

  unchanged.

A student has a bottle of cooking oil.

She determines the density of the cooking oil.

Which apparatus does she need?

• A

• B

• C

• D

Forces are applied to four identical objects.

The length of each arrow indicates the magnitude of the force.

Which object is in equilibrium?

• 
• 
• 
• 

The diagram shows a wooden beam PQ which is attached to a wall by a pivot at P and kept in a

horizontal position by a vertical rope attached at Q.

A box has been placed on the beam. Which changes must reduce the tension in the rope at Q?

• Decrease the mass of the box and move it towards P.

• Decrease the mass of the box and move it towards Q.

• Increase the mass of the box and move it towards P.

• Increase the mass of the box and move it towards Q.

A cyclist travels down a hill from rest at point X without pedalling.

The cyclist applies his brakes and the cycle stops at point Y. Which energy transfers have taken place between X and Y?

• gravitational potential --> kinetic --> internal (thermal)

• gravitational potential --> internal (thermal) --> kinetic

• kinetic --> gravitational potential --> internal (thermal)

• kinetic --> internal (thermal) --> gravitational potential

Which energy resource is non-renewable?

• geothermal

• natural gas

• solar

• wind

A pump does 460 000 J of work to raise water to fill a tank. It takes 7 minutes to fill the tank.

What is the power of the pump?

• 1.1 kW

• 66 kW

• 3200 kW

• 190 000 kW