Science Quiz friction

• How hard the surfaces push together * the types of surface involved

• a force that resist motion • occurs when two objects are pushed or pulled against each other • acts in the direction that is opposite motion

• Static • sliding • rolling • fluid

Acts on objects that are not moving

Occurs when two solid surfaces slide over each other

Occurs when an object rolls across a surface

Occurs when a solid object moves through fluid

A push or pull

Strength and direction

Newtons (N)

Resistance to change in motion

An object at rest will stay at rest and an object in motion will stay in motion until acted upon by an outside force

Combination of all forces acting on an object. Determines whether an object moved and in which direction

There is a change in the objects motion

Causes zero net force. Forces balance each other out

A force that pulls objects together

Mass and distance More mass=more gravity More distance=less gravity

Only force acting on a falling object is gravity

A force that works against gravity

The greatest velocity an object reaches. More mass=longer time to reach terminal velocity