| A | B |
|---|
| speed | rate of change in position |
| velocity | describes both speed and direction |
| deceleration | indicates a decrease in speed |
| gravity | a universal force acting on all objects |
| force | push or pull that one body exerts on another body. |
| rate | change over time |
| Newton's first law of motion | an object at rest will stay at rest |
| metric system | system internationale |
| Newton's second law of motion | a net force acting on an object will accelerate in the direction of the force |
| Newton's third law of motion | for every action there is an opposite and equal reaction |
| air resistance | force opposing the motion of a falling object near Earth's surface |
| centripetal force | causes circular motion |
| momentum | p = m x v |
| inertia | tendency of an object to resist change in motion |
| projectile | travels in a curved path |
| balanced forces | forces that are equal in size and opposite in direction |
| change in motion | unbalanced forces |
| weight | measure of force of gravity on an object |
| acceleration | rate of change in velocity |
| density | mass per unit volume |
| volume | amount of space taken up by an object |
| mass | amount of matter in an object |
| derived unit | obtained by combining SI units |
| law of conservation of energy | energy can't be created or destroyed |
| equation for work | Work = force times distance |
| equation for speed | speed = distance x time |
| heat | transfer of energy from warmer to cooler materials |
| energy | the ability to cause change or do work |
| kinetic energy | energy of motion |
| potential energy | stored energy |
| mechanical energy | total amount of kinetic and potential energy of an object |
| specific heat | energy required to raise the temperature of l kg material l K |
| thermal energy | total energy of particles in a material |
