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5th Unit B Chapter 2
Speed | A measure of how far something travels in a certain period of time |
Kilometers per hour | The number of kilometers something can travel in one hour |
Velocity | A measure of speed in a certain direction |
Inertia | The tendancy of an object to stay at rest or to remain in motion unless an outside force causes a change |
Gravity | A force that acts to pull pairs of objects together |
Mass | The amount of matter in an object |
Weight | The force gravity exerts on an object's mass |
Acceleration | Rate of change in speed or direction of movement |
Friction | A force resists the movement of one surface past another surface |
Air resistance | Friction caused by gas molecules in the air hitting an object and slowing it down |