Equations

Question 1

What is the equation for speed?

Answer 1

Speed=Distance/time

S=D/T

Question 2

What are the Equations for average speed?

Answer 2

1. Total Distance/Time. Sav=td/t

2. (Initial speed+final speed)/2. Sav=u+v/2

Question 3

What is the equation for rate of change of speed?

Answer 3

(Final speed-Initial speed)/Time

(Delta)S=(v-u)/t

Question 4

What is the equation for velocity?

Answer 4

Change in displacement/Time

V=(delta)s/t
=v-u/t

Question 5

Equation for average velocity

Answer 5

Vav=(v+u)/2

Question 6

What are the equations for resultant force?

Answer 6

Fr=MxA
Fr=T+D (for horizontal motion remember that force is vector so remember negative D)
Fr=T+W(For vertical motion, remember that force is vector, so remember negative for w)

Question 7

What is the equation for weight?

Answer 7

W=mg

Question 8

What is the equation for density?

Answer 8

d=m/v

Question 9

What is the equation for hookes law?

Answer 9

f=ke

Question 10

What is the equation for pressure?

Answer 10

P=f/a

Question 11

What is the equation for efficiency?

Answer 11

Efficiency= Useful E/Total E

Question 12

What is the equation for power?

Answer 12

P=w.d/t

*Note that w.d=energy transferred

Question 13

What is the equation for kinetic energy?

Answer 13

K.E=1/2mxv2

Question 14

What is the equation for gravitational potential energy?

Answer 14

g.p.e=mxgxh

Question 15

What is the equation for moments when d is a perpendicular Distance?

Answer 15

M=fxd

Question 16

What is the equation for moments for a system in rotational equilibrium?

Answer 16

f1xd1=f2xd2