Physics:Core equations

Question 1

Equation to find

Kinetic energy

Answer 1

Ke = 1/2mv²

Ke=Kinetic energy
m=Mass
v=Velocity

Question 2

Equation to find

Work done(J)

Answer 2

Energy transferred(J)

Question 3

Define

Joules(J)

Answer 3

Unit of energy

Question 4

Equation to find

Work(J)

Joules can aslo be expressed as Nm(Newton meters)

Answer 4

Force(N) x Distance(M)

N=Newtons , M=Meters

Question 5

Equation to find

GPE(Gravitational Potential energy)

Answer 5

mgh

m=Mass(KG), g=Gravitational field(N/KG) , h = Height(m)

Earth g=9.8N/KG

Question 6

Equation to find

Weight(N)

N=Newtons

Answer 6

Mass(KG) X Gravity(N/KG)

Thsi means GPE:Wh

Question 7

Equation to find

EPE(Elastic Potential Energy)

Answer 7

1/2ke²

k=Spring consant(N/m)[how stiff the spring is],e=extension(m)

Question 8

Equation to find

E%(Efficencly)

Answer 8

useful energy output/total energy outputx100

Question 9

Equation to find

Q(Charge)

Coulombs

Answer 9

It

I=Current(Amps(A)) , t = Time(secs(s))

Question 10

Equation to find

Energy required to move one coulbomb(E)

Answer 10

VQ

V=Voltage/p.d(Volts(V)) , Q = Charge(Coulombs(C))

Question 11

Equation to find

Voltage(V)

Answer 11

IR

I=Current(Amps(A)) , R = Resisitance(Ohms(Ω))