Question

What is the difference between mass and weight?

Asked by: Eddo

Answer

Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter. Thus if you were to travel to the moon your weight would change because the pull of gravity is weaker there than on Earth but, your mass would stay the same because you are still made up of the same amount of matter.

Answered by: A. Godbehere, High School Student, Port Perry



Imagine yourself out is space away from any gravitational field, with a bowling ball in your hands. Let it go and it just floats in front of you. Without gravity, it has no weight. Now grab it again and shake it back and forth. That resistance to being moved is inertia, and mass measures how much inertia an object has. Inertia does NOT depend on gravity.

Mass is determined only by the amount of matter contained in an object.

Any two masses exert a mutual attractive force on each other. The amount of that force is weight. A one kilogram mass on the Earth's surface results in 2.2 pounds of force between the mass and the Earth, so we say the mass weighs 2.2 pounds. That same one kilogram mass on the Moon, because of the Moon's lower mass, results in only about 1/3 pounds of mutual force.

Just remember that the weight of an object depends on where it is, while its mass stays the same.

Answered by: Paul Walorski, B.A., Part-time Physics Instructor

Search

Loading






Science Quote

'To myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.'

Isaac Newton
(1643-1727)

Top Selling

Here are our physics & astronomy bestsellers:
Magnetic Levitator - Classic
KonusScience 5 Way Microscope Kit
Space Wonder Gyroscope
CHEM C2000 Chemistry SuperKit v2.0
Periscope
Snap Circuits Jr.
Solar Radiometer
Mini Plasma Ball
Smart Robot 4M Kit
Cool Blue Light Experiment Kit

Sponsors

USC University of Southern California Dornsife College Physics and Astronomy Department McMaster University Physics and Astronomy Department