Important Exam Facts

Question 1

Forward Dynamics (Simulation):

Answer 1

Forces -> Resulting Motion (Understanding of performance)

Question 2

Inverse Dynamics:

Answer 2

Kinematic Data -> Applied Forces (Understanding of injuries)

Question 3

Assumptions of acceleration of a body in free-flight:

Answer 3

No air resistance and gravity is constant (9.81ms^-2)

Question 4

SUVAT equations:

Answer 4

S=ut + 1/2at^2
S=1/2(v+u)t
S=vt - 1/2at^2
V=u +at
V^2=U^2 + 2as

Question 5

Apex and Range of a projectile:

Answer 5

Apex: x=u0v0 / g
Range: R=2u0v0 / g

Question 6

What angle does the maximum horizontal range occur at?

Answer 6

45 degrees = W^2sin2a / g

Question 7

Newton’s Laws:

Answer 7

1st law: Law of inertia- more inertia means it’s harder to move
2nd: F=ma
3rd: During impact reaction forces cancel =0

Question 8

Weightless:

Answer 8

A body is said to be ‘weightless’ when it is freely falling under gravity

Question 9

Impulse:

Answer 9

P=Ft=mat=m(v-u)=mv-mu=change in momentum

Question 10

Conservation of linear momentum:

Answer 10

m1u1 + m2u2 = m1v1 + m2v2

Question 11

Coefficient of restitution:

Answer 11

(v2-v1)=e(u1-u2), e=v2-v1/u1-u2, 0<e<1

Question 12

Potential Energy:

Answer 12

PE=mgh, PE=0 usually at lowest point (h=0)

Question 13

Kinetic Energy:

Answer 13

KE=1/2 mv^2

Question 14

Mechanical Energy:

Answer 14

ME= KE + PE, ME= 1/2 mv^2 + mgh

Question 15

Work:

Answer 15

F= Force x distance = change in kinetic energy. (If F isn’t constant we must integrate)

Question 16

Distance of an arc:

Answer 16

s=r*theta

Question 17

Tangential velocity:

Answer 17

v=rw

Question 18

Tangential acceleration:

Answer 18

a=ra

Question 19

Radial velocity:

Answer 19

v=0

Question 20

Radial acceleration:

Answer 20

a=v^2/r=rw^2

Question 21

Moment of Inertia:

Answer 21

Ig= Sum of mx^2
Io= Sum of m(x+d)^2
Io= Ig + M*d^2 (parallel axis theorem)

Question 22

Angular momentum:

Answer 22

ho= mvr
hg= sum of mvr = Igw

Question 23

Conservation of angular momentum:

Answer 23

Isws = Itwt

Question 24

Vtop when ‘weightless’:

Answer 24

Vtop=sqrt(rg)

Question 25

Vbot:

Answer 25

Vbot=sqrt(2gh + Vtop^2)