unit 2 - forces and motion Flashcards
(22 cards)
how to get average speed
distance moved/ time taken
how to get average acceleration
change in velocity/ time taken
a= (v-u)/t
what does it mean by a uniform acceleration
a constant acceleration
what is v and u in the acceleration formula
u is the initial velocity
v is final velocity
what is the value of gravity
10m/s^2
what is a si unit for force
newton
what is an upthrust
the upward force from a liquid
what is a weight
the gravitational force
what is a tension
force in a stretched material
what is a thrust
the forward force (from the engine)
formula for force
force= mass* acceleration
what is a friction
the force that tries to stop materials sliding across each other
formula for weight
w=mg
formula for momentum
momentum = mass* velocity
what is an impulse
change in momentum
formula for impulse
FT = mv-mu
what is the law of conservation of momentum
when two or more objects act on each other, their total momentum remains constant, providing no external forces acting
what are vectors
the force that has a direction as well as the magnitude
what are scalars
have magnitude but no direction
what is the centripetal force
the inward force needed to make an object move in a circle
how to increase centripetal force
increase
mass of the object
speed of the object
decrease
the radius of the circle
describe the velocity and the speed in the centripetal force
speed is the same but velocity is constantly changing
