💙mechanics💙

what way do you resolve projectiles?

vertically and horizontally

define centre of mass

a single point that you can consider the whole weight of the object to act

what is impulse?

change in momentum

air resistance is proportional to the square of …..?

the speed

in projectile motion what is the vertical acceleration?

g

what is thrust?

resultant upwards force

what type of momentum is always conserved?

linear

the rate of change of momentum is also described as?

force

what is impulse?

change in momentum

what is the rate of work done?

power

what is lift?

an upward force which acts on objects travelling in a fluid

what are the types of collision?

inelastic and elastic

what is the gradient of a displacement time graph?

velocity

what does the gradient of a velocity time graph show?

acceleration

area under a velocity time graph equals?

distance

area under acceleration time graph is equal to what?

change in velocity

what safety features reduce damage?

crumple zones, seat belts, air bags

when is work done?

when energy is transferred

work = ?

force x distance

what is power in terms of work?

work done / time

how is work done calculated if we want the answer in joules?

lost KE so 0.5mv squared

what is conserved in an inelastic collision?

total momentum only

what makes constant momentum?

drag=thrust

if on a velocity time graph, graph goes below x axis, is distance positive or negative?

positive

same diameter with different masses, what is the acceleration? same, or different?

same

when is horizontal velocity at a minimum?

when vertical velocity = zero