mock - forces Flashcards
scalar and vector
scalar - magnitude
vector - magnitude and direction
weight and mass
weight - force acting upon the object (gfs)
mass - amount of stuff inside an object
spring practice
- measure natural length of spring w ruler
- add must to spring and measure new length
- extension = change in length
moment
foces causing an object to rotate
lever
increase distance from pivot - less force needed for the same moment
gear
- circular discs with teeth
- teeth interlock and turn causing the others to turn
upthrust and examples
a forces that pushes something upwards which is submerged in fluid or gas
- upthrust equal to weight of object - floats
- upthrust less than the objects wight - sinks
acceleration and deceleration
acceleration - rate of change of velocity
deceleration - negative of this (slows down)
DISTANCE time graphs
gradient = speed
- steeper = faster
- flat = stationary
- curves = acceleration
- straight line = steady speed
VELOCITY time graphs
gradient = acceleration
- flat = steady speed
- uphill acceleration = straight upwards line
- curve = changing acceleration
- area under section = distance travelled
air resistance
- upwards force in opposition to weight
- collision of particles between object and air
terminal velocity
air resistance equal to the weight
resultant force of 0
newtons 1st law and example
“no resultant force then the motion won’t change”
- resultant force of stationary object 0 (motion isn’t changing)
- resultant foes of moving object 0 constant speed (no changing motion)
newtons 2nd law
“the size of the resultant force is directly proportional to the acceleration it causes”
inertia and example
a measure of how much an object will stay in its current state
- large mass = lots of inertia (requires a big force to change velocity)
