Equations for Forces

Question 1

weight

Answer 1

weight= mass x gravitational field strength

W =mg

Question 2

work done

Answer 2

work done = force x distance (moved along the line of action of the force)
W = Fs

Question 3

force

Answer 3

force = spring constant x extension
F = ke

Question 4

moment of a force

Answer 4

moment of a force = force x distance (perpendicular to the direction of the force)
M = Fd

Question 5

pressure

Answer 5

pressure = force normal to a surface / area of that surfa ce

p=F/A

Question 6

distance travelled

Answer 6

distance travelled = speed x time

s = vt

Question 7

acceleration

Answer 7

acceleration = change in velocity / time taken
a = /_\ (triangle)v / t
acceleration = final velocity - initial velocity / time taken
a = v - u / t

Question 8

resultant force

Answer 8

resultant force = mass x velocity

F = ma

Question 9

momentum

Answer 9

momentum = mass x velocity
p = mv