Mechanics Flashcards
1
Q
Work done
A
Force x Distance
OR
change in KE/1/2m(v² - u²)
2
Q
Work done against gravity
A
mass x acceleration due to gravity x height (mgh, where g = 9.8)
3
Q
Work energy principle
A
change in total energy of a particle = work done on the particle
4
Q
Kinetic energy
A
1/2mv²
5
Q
Gravitational potential energy
A
mgh
6
Q
Conservation of mechanical energy
A
initial KE + initial PE = final KE + final PE
1/2mu² + mgh1 = 1/2mv² + mgh2
7
Q
Power
A
work done/time
force x velocity
8
Q
Momentum
A
Mass x velocity
9
Q
Impulse
A
Force x Time
change in momentum = mv - mu
10
Q
Conservation of momentum
A
m1u1 + m2u2 = m1v1 + m2v2
11
Q
Newtons law of restitution
A
speed of separation of particles/speed of approach
v2 - v2/u1 - u2
12
Q
range of e
A
0 ≤ e ≤ 1
e = 0: perfectly inelastic collision
e = 1: perfectly elastic collision
