Mechanic Flashcards
Explain triangle of forces
Move vectors to form a triangle and use magnitude of force for length of each side
How to work out friction
Resolve vertical, Fr = uR
Name as many suvats as you can
Check book
Describe different equations of friction based on circumstance
F < uR no sliding
F = uR limiting equilibrium
Same as ^ when sliding occurs
How to solve moments
Resolve and take around a certain point Fd
All cases for toppling
In equilibrium or sliding F < uR weight acts vertically down
About to topple, weight acts through point of toppling
Toppling weight is other side of vertically down
Kinetic energy formula
0.5mv^2 - 0.5mu^2
Work done
Fd
Proof as to why work done = KE
F = ma
a = F/m
Use v^2 = u^2 + 2as
How does gravitational potential work
Mgh
Loss in P.E = gain in K.E
What is conservation of mechanical energy
When gravity is only force which does work, mechanical energy conserved
What is power
Power = work/time
Power = Fv
Equation for impulse
Ft = mv - mu
What happens to momentum in a collision
Conserved
Coefficient of restitution
Speed of separation / speed of approach = constant
Vb - Va / Ua - Ub = e
