Forces Flashcards
Force equation
M= W over G
Mass definiton
how much of you there is in kg
Weight definiton
it is a force- it changes depending wherr you are in the universe ( Earth- you have weight becasue of Gravtiy, Moon- less wieght becasue of less gravity)
What causes objects to to remain staitonary
equal forces, e.g box on table remains stationary as upthrust is = to weight
What causes objects to move at a steady speed
Equal forces on moving object, e.g car travels at constant speed becasue the thrust= to the friction.
What causes objects to speed up
Unbalanced forces, e.g kick a football- the thrust is bigger than friction
What causes objects to stop moving
unbalanced forces, e.g falling book hits the floor- upthrust bigger than wright
what causes objects to change direction
unbalanced forces, e.g cricket ball hit by bat
what causes objects to change shape
unbalanced forces, e.g sqush a sponge with hand
what causes objects to turn or twist
unbalanced forces, e.g twist of a bottle top
What is the resultant force
difference between two opposing forces
how to find resultant force
minus bigger force by smaller force
How is friction caused
by objects rubbing agiasnt eachother
What do you call two solids rubbing agiasnt eachother
friction
what do you call an liquid and a solid rubbing aginst eachother
water resistance
