equations

Question 1

equation for density?

Answer 1

density = mass / volume

Question 2

equation for distance travelled?

Answer 2

distance travelled = speed x time

Question 3

equation for acceleration?

Answer 3

acceleration = change in speed / time

Question 4

equation for kinetic energy?

Answer 4

kinetic energy = 0.5 x mass x (speed)^2

Question 5

equation for force?

Answer 5

force = mass x acceleration

Question 6

equation for momentum?

Answer 6

momentum = mass x velocity

Question 7

equation for work done?

Answer 7

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

Question 8

equation for power?

Answer 8

power = work done / time

Question 9

equation for force exerted by a spring?

Answer 9

force exerted by a spring = extension x spring constant

Question 10

equation for gravity force?

Answer 10

gravity force = mass x gravitational field strength

Question 11

equation for potential energy in a gravity field?

Answer 11

potential energy = mass x height x gravitational field strength

Question 12

equation for pressure?

Answer 12

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

Question 13

equation for moment of a force?

Answer 13

moment of a force = force x distance(normal to direction of the force)

Question 14

equation for charge flow?

Answer 14

charge flow = current x time

Question 15

equation for potential difference?

Answer 15

potential difference = current x resistance

Question 16

equations for energy transferred?

Answer 16

energy transferred = charge x potential difference
or
energy transferred = power x time

Question 17

equations for power?

Answer 17

power = potential difference x current
or
power = (current)^2 x resistance

Question 18

equation for wave speed?

Answer 18

wave speed = frequency x wavelength

Question 19

equation for efficiency?

Answer 19

efficiency = useful output energy transfer / input energy transfer