O LevelPhysicsCambridgeTopic Questions1. Motion, Forces & Energy1.3 Mass & Weight

Mass & Weight (Cambridge O Level Physics)

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1a
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An astronaut travels from Earth to the Moon.

Gravitational field strength on Earth = 9.8 N/kg

Gravitational field strength on the Moon = 1.6 N/kg

Identify the quantity that is the different for the astronaut on the Moon compared to the Earth.

Tick one box.

 
square mass
square weight
square density

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1b
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The mass of the astronaut is 65 kg on Earth.

                            
(i)
Calculate the astronaut’s weight on Earth.
[2]
(ii)
Calculate the astronaut’s weight on the Moon
[1]

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1c
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Complete the following sentence.

The astronaut's weight on Earth is more than their weight on the Moon because, although their ..................... is the same, the .......................... force on Earth is ............................

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1d
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What piece of equipment can be used to compare the mass and weight of the astronaut while they are still on Earth?

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1a
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Fig. 2.1 shows a raft floating on water.

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A force of 20 000 N acts on the raft in the direction of the arrow shown in Fig. 2.1.

 
(i)
State the name given to the force shown in Fig. 2.1.
[1]
 
(ii)
Calculate the mass of the raft.
 
 
mass = ......................................................kg [3]

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1b
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A sail is added to the raft, as shown in Fig. 2.2.

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Fig. 2.2 shows the horizontal forces acting on the raft at one moment.

 
Calculate the resultant horizontal force acting on the raft and state the direction of this force.

 

 

force = ............................................................ N

 
direction = ...........................................................

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