ALL EQUATIONS

Question 1

what is the equation for density

Answer 1

density= mass/ time

Question 2

what is the equation for speed

Answer 2

speed= distance/ time

Question 3

what is the equation for acceleration

Answer 3

acceleration= speed or velocity/ time

Question 4

what is the equation for force

Answer 4

force (N)= mass (kg) x acceleration (m/s/s)

Question 5

what is the equation for weight

Answer 5

weight (N)= mass (kg) x gravitational field strength (m/s/s) or (N/kg)

Question 6

what is the equation for momentum

Answer 6

momentum (kg m/s)= mass (kg) x velocity (m/s)

Question 7

what is the equation for resultant force

Answer 7

resultant force= change in momentum/ change in time

Question 8

what is the equation for impulse

Answer 8

impulse= force x time

Question 9

what is the equation for moment

Answer 9

moment (Nm)= Force(N) x distance (m)

Question 10

what is the equation for spring constant

Answer 10

spring constant = load/ extension

Question 11

what is the equation for pressure

Answer 11

pressure (N/m2)= force (N)/ area (m2)

Question 12

what is the equation for pressure in liquids

Answer 12

pressure in liquids= density x gravity x depth

p=pgh

Question 13

what is the equation for air pressure

Answer 13

P1 x V1 = P2 x V2

Question 14

what is the equation for work

Answer 14

work (J) = force (N) x distance (m)

Question 15

what is the equation for gravitational potential energy

Answer 15

gravitational potential energy= mass x gravity x height

GPE=mgh

Question 16

what is the equation for kinetic energy

Answer 16

kinetic energy = 1/2 mass x velocity2

KE=1/2mv2

Question 17

what is the equation for efficiency

Answer 17

efficiency= useful work done/ total energy impute

Question 18

what is the equation for power

Answer 18

power= work done or energy transferred/ time taken

Question 19

what is the equation for useful work impute

Answer 19

force x speed

Question 20

what is the equation for energy transferred

Answer 20

energy transferred (J) = mass (kg) x specific heat capacity (J/ C or K) x temperature change (Δ C or K)

or

energy transferred (J) = voltage (V) x time (s) x current (A)

or

energy transferred= mass x latent heat (fusion or vapor)

Question 21

what is the equation for speed in a wave diagram

Answer 21

speed= frequency x wavelength

V=f x λ

Question 22

what is the equation for the speed of normal sound and the speed of an echo

Answer 22

normal:
speed= distance travelled/ time taken

echo:
speed= distance x2/ time