physics equations unit 1-4

Question 1

efficiency = ?

Answer 1

useful energy output / total energy input x 100

Question 2

weight = ?

Answer 2

mass x gravitational potential (10)

Question 3

work done = ?

Answer 3

force x distance

Question 4

gravitational potential energy = ?

Answer 4

mass x gravitational field x height

Question 5

kinetic energy = ?

Answer 5

1/2 x mass x speed^2

Question 6

speed = ?

Answer 6

distance / time

Question 7

velocity = ?

Answer 7

displacement / time

Question 8

acceleration = ?

Answer 8

final velocity - initial (starting) velocity / time

Question 9

final velocity = ?

Answer 9

initial velocity + acceleration x time

Question 10

average speed = ?

Answer 10

initial velocity + final velocity / 2

Question 11

final velocity ^2 = ?

Answer 11

initial velocity^2 + 2 x acceleration x distance

Question 12

force = ?

Answer 12

mass x acceleration

Question 13

weight = ?

Answer 13

mass x gravity

Question 14

velocity = ?

Answer 14

wavelength x frequency

Question 15

angle of incidence = ?

Answer 15

angle of refraction

Question 16

angle of refraction = ?

Answer 16

angle of incidence

Question 17

sin c (critical angle) = ?

Answer 17

1/n (refractive index)

Question 18

refractive index = ?

Answer 18

sin i (angle of incidence) / sin r (refractive angle)

Question 19

power = ?

Answer 19

current x voltage
or
charges x voltage

Question 20

energy = ?

Answer 20

power x time

Question 21

charges = ?

Answer 21

current x time

Question 22

voltage = ?

Answer 22

current x resistance