Equations

Question 1

Gravitational potential energy equation

Answer 1

Eg=mgh

Mass(kg) x gravity (N/kg) x height (m)

Question 2

Kinetic energy equation

Answer 2

Ek= 0.5mv2

1/2x mass (kg) x velocity (m/s)

Question 3

Elastic potential energy Equation

Answer 3

Ee=0.5ke2

1/2 spring constant (N/kg) x extension (m) squared

Question 4

Work equation

Answer 4

W=F*S

work= force (n) x distance (m

Question 5

Weight equation

Answer 5

W=m*g

weight = mass (kg) x gravity (N/kg)

Question 6

Power equation

Answer 6

E
P= —
T

Question 7

Voltage equation

Answer 7

V=I*R

Voltage = Current (amps) x Resistance

Question 8

Energy equation

Answer 8

E=Q*V

Question 9

Charge flow equation

Answer 9

Q = I*T

Charge flow (coulombs) = current( Amps) x time (seconds)

Question 10

Power equations

Answer 10

P=IV
P=I2R
P= E divided by T

Question 11

Earth gravity

Answer 11

9.8N/kg

Question 12

Efficency equation

Answer 12

E = Useful output
———————- x 100 (for a percentage)
total input

Question 13

how do you calculate the power supplied to an electrical appliance

Answer 13

P= IxV

Power (W) = current( amps) x potential difference (Volts)

Question 14

What is current (I) measured in?

Answer 14

Amps

Question 15

What is speed (v) measured in?

Answer 15

minutes per second

Question 16

What is mass (m) measured in ?

Answer 16

kg

Question 17

Equation for speed

Answer 17

V = d
—–
t

Velocity = distance (m) divided by time

Question 18

Distance and height are measured in ?

Answer 18

metres

Question 19

Energy is measured in?

Answer 19

Joules

Question 20

Force is measured in?

Answer 20

newtons

Question 21

power is measured in?

Answer 21

watts

Question 22

Time is measured in?

Answer 22

Seconds

Question 23

Density

Answer 23

volume

Question 24

wavespeed

Answer 24

frequency x wavelength