Chap 5 - 6

Question 1

Moment formula

Answer 1

M = F*d
Moment = Force(N) * Distance (m)

Question 2

Principle of Moment

Answer 2

Sum of clockwise moment is equal to the sum of anti-clockwise moment about the same pivot

Question 3

List the 6 Energy Stores

Answer 3

Kinetic Store
Elastic Potential Store
Gravitational Potential Store
Internal(Thermal) Store
Chemical Potential Store
Nuclear Store

Question 4

What is the 4 ways energy is transferred

Answer 4

Mechanically(moved by a force)
Heating
Waves
Electrically

Question 5

Principle of Conservation of Energy

Answer 5

Energy cannot be created or destroyed, only transferred from one store to another, but the total amount in a system is constant

Question 6

Kinetic Store(KE) formula

Answer 6

½mv²
½(mass)(velocity)²
Si unit: Joule

Question 7

Gravitational Potential Store(GPE) formula

Answer 7

mgh
(mass)(10N/kg)(height)
unit:Joule

Question 8

Work done formula

Answer 8

WD=Fd
work done = forcedistance
unit:Joule

Question 9

Power formula

Answer 9

P= E/t OR P=WD/t
Energy/time OR Work Done/time
unit: Watt or Joule/sec