9G1 Mass & Weight

The gravitational field strength on the Moon is about a sixth of that on the surface of the Earth. On Earth, an astronaut weighs 900 N and the gravitational field strength is 10 N / kg.

What is the astronaut’s mass on the Moon?

• 15 kg

• 90 kg

• 150 N

• 900 N

The unit of mass is

• kg

• N

• Nm

• W

The unit of Weight is

• kg

• N

• Nm

• W

On earth, the gravitational field strength is about

• 1.6 N/kg

• 16 N/kg

• 10 N/kg

• 1 N/kg

1An object of mass 4.0 kg is situated at point where there is gravitational field strength of 9.0 N/kg.

What is the weight of the object?

• 36 N

• 3.6 N

• 360 N

• 3600 N

A hammer has a mass of 0.75 kg.

Its weight on the Moon is 1.25 N.

What is the hammer's mass on earth?

• 0.75 N

• 1.25 kg

• 0.75 kg

• 1.25 N

A student lifts a sack of mass 50 kg through a vertical distance of 2.4 m in 0.80 s.

The gravitational field strength g is 10N/kg.

What is the weight of the sack?

• 500 kg

• 500 N

• 500 N/kg

• 50 kg

Define mass

• Pull of gravity on an object

• Amount of matter in an object

• region where object experience a force

• ability to do work

Define Weight

• pull of gravity on an object

• amount of matter in an object

• Force that pull pair of gravity together

• ability to do work

Which formulae is incorrect?

• g = W / m

• W = m X g

• g = m / W

• m = W / g