Mechanics Equations to Learn

Question 1

Equation for tension

Answer 1

T=(lambda)x/l

Question 2

Equation for elastic potential energy

Answer 2

E=(lambda)x^2/2l

Question 3

Equation for e

Answer 3

e = (speed of separation)/(speed of approach)

Question 4

“tendency to slip” means …

Answer 4

friction

Question 5

Vector equation for Kinetic Energy

Answer 5

KE = 0.5m(v . v)

Question 6

Dot product of two vectors (a b) and (c d)

Answer 6

ac + bd

Question 7

Vector equation for timeless suvat

Answer 7

v . v = u . u + 2as (all vectors)

Question 8

Centre of mass equation using displacement and mass

Answer 8

x bar = sigma(mx)/sigma(m)

Question 9

Centre of mass of triangular lamina

Answer 9

x bar = average of x-coordinates

y-bar = average of y-coordinates

Question 10

Centre of mass equation using area and displacement vector

Answer 10

r bar = sigma(A r-vector)/sigma(A)

Question 11

Centre of mass equation using length and displacement

Answer 11

r bar= sigma(l r-vector)/sigma(l)