9 Forces and momentum Flashcards
force
any interaction that can change the velocity of an object
momentum
mass x velocity
total final momentrum = total initial momentrum
energy can’t be created or destroyed
newton’s first law of motion
an object remains at rest or in uniform motion unless acted on by a resultant force
principle of moments
for an object in equilibrium the sum of the clockwise moment at any point = the sum of the anticlockwise moment
impulse
F∆t = ∆(mv)
where F is constant
force time graph
F = (mv-mu )/ t
area under the graph = change in momentum
change in momentum
final momentum - initial momentum
F = (-mv)-(mu) / t
newton’s third law of motion
when one objects interact, they exert equal and opposite forces on each other
elastic collision
no loss of kinetic energy
inelastic collision
where the colliding objects have less kinetic energy after the collision than before the collision
explosion
total initial momentum = 0
m1v1 - m2v2
force is the rate of change of momentum
F = Δ(mv) / Δt
