Mechanics 2 Flashcards
1
Q
Projectiles: Horizontal velocity
A
u cos θ
2
Q
Projectiles: Vertical velocity
A
u sin θ -gt
3
Q
Projectiles: Horizontal displacement
A
u cos θ t
4
Q
Projectiles: Vertical displacement
A
u sin θ t -0.5gt^2
5
Q
sec^2 θ =
A
tan^2 θ + 1
6
Q
Work Done
A
Force x distance in the direction of the force
7
Q
Change in Kinetic Energy
A
0.5mv^2 - 0.5mu^2 (= Fs)
8
Q
Power
A
Work done / Time
9
Q
Uniform Object
A
Centre of mass is at the centre of symmetry
10
Q
Moment
A
Force x Perpendicular distance
11
Q
What 2 things can you look at that are to do with moments?
A
Anticlockwise = Clockwise
Resultant force = 0
12
Q
Centre of mass
A
(m1x1 + m2x2 + m3x3…) / m
13
Q
What do you know about the centre of mass of a hanging object?
A
Vertical forces are equal and in line
14
Q
What methods can you use to find forces?
A
Resultants
Moments
F=ma
15
Q
How do you go from v to ω?
A
v=rω
