terminal velocity

weight = mass times gravitational field strength 

the force acting downwards is their wieght.

the force acting upwards is the air resistance.

van de graff- a generator which uses a rubber belt and a metal sphere to generate high voltage.

watt- a unit of power,1 watt equals 1 joule of energy is transferred.

voltage- a potential difference across a component.

kinectic energy- scientific name for movement.

rates of reaction 

how quickly reactions happen?-products made,reactants used.

rates of reaction= amount of product made devided by time.

reactions only happen when particles collide.

temprerature 

increase of temperature increases th rate of reaction.

higher the tempreture makes particles move faster.

concentration 

the more concentration,the greater number of solute particles.

catylists

hydrogen peroxide > water + oxygen 

you can increase the rate of reaction by adding a catylist