2.09 FORCE, WEIGHT, & GRAVITY

Which statement about mass or weight is correct?

• Mass is a force.

• Mass is measured in newtons.

• Weight is a force.

• Weight is measured in kilograms.

Which instrument is used to compare the masses of objects?

• a balance

• a barometer

• a manometer

• a measuring cylinder

The mass of an astronaut is 70 kg on the Moon.

What is the mass of the astronaut on the Earth?

• 7 kg

• 70 kg

• 80 kg

• 700 kg

A 1 kg sample of aluminium is stored in a laboratory. In a different laboratory, in the same town,

there is a 1 kg sample of iron.

Which quantity must these two samples always have in common?

• the same density

• the same temperature

• the same volume

• the same weight

Two blocks of metal X and Y hang from spring balances, as shown in the diagrams.

What does the diagram show about X and Y?

• They have the same mass and the same volume but different weights.

• They have the same mass and the same weight but different volumes.

• They have the same mass, the same volume and the same weight.

• They have the same weight and the same volume but different masses.

Which is the unit for force and which is the unit for weight?

• F = kg, W = kg

• F = kg, W = N

• F = N, W = kg

• F = N, W = N

A geologist places a small rock on the left-hand pan of a balance. The two pans are level as shown when masses with a total weight of 23 N are placed on the right-hand pan.

Take the weight of 1.0 kg to be 10 N.

What is the mass of the small rock?

• 0.023 kg

• 2.3 kg

• 23 kg

• 230 kg

The mass of an object is measured on Earth. The mass is 5.0 kg.

The object is taken to the Moon. The mass of the object is measured on the Moon.

What is the mass of the object on the Moon?

• 0 kg

• more than 0 kg, but less than 5.0 kg

• 5.0 kg

• more than 5.0 kg

An object has a mass of 50 kg.

The gravitational field strength on Earth is 10.0 N/kg.

The gravitational field strength on a distant planet is 4.0 N/kg.

What is the weight of the object on Earth, and what is its weight on the distant planet?

• on Earth = 5.0 kg, on the distant planet = 12.5 kg

• on Earth = 5.0 N, on the distant planet = 12.5 N

• on Earth = 500 kg, on the distant planet = 200 kg

• on Earth = 500 N, on the distant planet = 200 N

Weight is an example of which quantity?

• acceleration

• force

• mass

• pressure