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Mass, Weight, Density and Pressure
Quick questions on Mass and weight explained: O-Level Physics
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is mass?Show answer
Mass is the amount of matter in an object. It is a scalar, measured in kilograms (), and it does not change when the object is moved to the Moon, into space, or up a mountain. Mass also measures inertia, the reluctance of an object to change its motion.
What is weight?Show answer
Weight is the gravitational force acting on an object. It is a vector pointing downward (toward the centre of the Earth), measured in newtons ():
What is gravitational field strength?Show answer
The gravitational field strength is the force of gravity on each kilogram of mass:
What is q1?Show answer
State the difference between mass and weight, including their units. [2 marks]
What is q2?Show answer
A box has a mass of . Find its weight on Earth, where . [2 marks]
What is q3?Show answer
Explain why an astronaut weighs less on the Moon than on Earth but has the same mass. [3 marks]
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