physics Flashcards
volume
the space occupied by an object
meniscus
curved upper surface of a liquid
mass
the quantity of matter a body is composed of
density
the ratio of mass to volume of a substance
weight
the downward force of gravity that acts on an object because of its mass
what is the equation for finding density
density= mass over volume
speed
the distance travalled by an object per unit of time
what is the equation for average speed
average speed =total distance traveled over total time taken
what is the equation for finding speed
speed= distance over time
acceleration
the rate of change of an objects velocity
veloctiy
the speed of an object in a stated direction
vector quanity( velocity)
has both magnitude and direction
scalar quanity (speed)
is something that has magnitude but no direction
how to find distance travalled on a graph
area under the speed time graph
how to find speed on a distance-time graph
the slope
equation for acceleration
change in velocity over time taken
Force
the action on one body on a second body
Newton
the force required to give a mass of 1kg an acceleration of 1m/s
resultant force
the left over force after you cancel out the opposite force
gravity
the force that exist between any two objects with mass
terminal veloctiy
the greatest speed reached by and object when moving through a fluid
what is the equation for force
force= mass times acceleration
turning effect
when a force causes an object to rotate or would make the object rotate if there were no resistive forces
pivot
the fixed point wich a lever turns
moment
the turning effect of a force about to pivot
equation for moment
force times perpendicular distance from pivot
equilibrium
when no net force and no net moment act on a body
centre of gravity
all the mass of an object could be locate here and the object would be the same
equation for kinetic energy
1/2 times mass time velocity squared
what is the unit for weight.
newtons
