# Okay. I have a test coming up soon, and I was wondering how to explain Weight and Friction. Mass is the stuff inside an object, so what is weight?

And how do you describe friction?
Thanks for reading, hope you can help.

Weight is the attraction of an object as a result of gravity.

http://theory.uwinnipeg.ca/mod_tech/node25.html

http://en.wikipedia.org/wiki/Friction

## Weight is the force acting on an object due to gravity. It is the measure of the pull of gravity on an object's mass. To calculate weight, you can use the formula W = m * g, where W represents the weight, m represents the mass of the object, and g represents the acceleration due to gravity.

For example, if an object has a mass of 10 kilograms on Earth, where the acceleration due to gravity is approximately 9.8 m/s^2, you can calculate its weight using the formula:

W = 10 kg * 9.8 m/s^2 = 98 N (where N represents Newton, the unit of force)

To understand friction, it is the force that opposes the relative motion or tendency of motion between two surfaces in contact with each other. It acts parallel to the surface and depends on the nature of the surfaces and the force pushing them together. Friction is caused by irregularities and interlocking of microscopic bumps and roughness on the surfaces.

Friction can be classified into two types: static friction and kinetic friction. Static friction is the force that opposes the initiation of motion between two surfaces, whereas kinetic friction is the force that opposes the motion of two surfaces already in relative motion.

To further understand the concept of friction, I recommend visiting the provided links. They offer more detailed explanations and examples to deepen your understanding of weight and friction.