Forces Formulas

Question 1

what is the formula for density

Answer 1

mass/volume

Question 2

calculate average speed

Answer 2

distance/time

Question 3

average acceleration/deceleration

Answer 3

v-u/t

Question 4

formula which links force and acceleration

Answer 4

f=ma

Question 5

how do you calculate momentum

Answer 5

mass x velocity

Question 6

difference between velocity and speed

Answer 6

velocity depends on direction of the moving object, speed doesn’t

Question 7

how do you find weight

Answer 7

mass x gravitational force

Question 8

what are moments

Answer 8

the turning effect of a force

Question 9

how do you calculate moments

Answer 9

moment = force x perpendicular distance

Question 10

principal of moments

Answer 10

f1d1 = f2d2

Question 11

hooke’s law of extension

Answer 11

force/load = spring constant x extension

Question 12

find pressure using force

Answer 12

pressure = force/area

Question 13

pressure in a liquid/gas

Answer 13

pressure = desnsity x g x depth(or height)

Question 14

how do you convert kelvin to celcius

Answer 14

-273

Question 15

state boyle’s law

Answer 15

pressure and volume in gases of a fixed mass at a fixed temperature are inversely proportional

Question 16

what is the formula used to prove boyle’s law

Answer 16

p1v1 = p2v2

Question 17

calculate work done

Answer 17

work done = force x distance moved

Question 18

calculate gpe

Answer 18

gpe = mass x g x height (or weight x height)

Question 19

how do you calculate kinetic energy

Answer 19

1/2mv^2

Question 20

how do you define power

Answer 20

rate of work done

Question 21

formula of power

Answer 21

work done/time

Question 22

what is efficiency

Answer 22

amount of useful work done

Question 23

formula to find the percentage efficiency?

Answer 23

useful work done/total energy input x 100