Forces And Energy

Question 1

Formula For Weight:

Answer 1

W= Mg (Weight= Mass x Gravitational Field Strength)

Question 2

Formula For Mass:

Answer 2

M= W/g (Mass= Weight/ Gravitational Field Strength)

Question 3

Formula For Direct Proportion:

Answer 3

F=Ke (Force applied= Spring constant x Extension)

Question 4

Is Weight N or Kg?

Answer 4

N

Question 5

Is Mass N or Kg?

Answer 5

Kg

Question 6

What Is The Formula For Work?

Answer 6

W = Fs (Work= Force x Distance)

Question 7

What Is The Formula For Power? (2 answers)

Answer 7

Power= Energy Transferred / Time

Power= Work Done / Time

Work Done and Energy Transferred are Synonyms (LIGHTBULB!)

Question 8

What Is The Formula For Watts?

Answer 8

Watts= Joules / Seconds

Question 9

How Do We Calculate Efficiency?

Answer 9

Efficiency= Useful energy (power) output / Total energy (power) input x 100%

Question 10

Formula For Energy Being Transferred To The GRAVITATIONAL POTENTIAL Store:

Answer 10

Eg = mgh

(Change in gravitational potential energy = Mass x Gravitational Field Strength x Change in height)

Question 11

Formula For Energy Being Transferred To The KINETIC Store:

Answer 11

Ek = mv^2 / 2

(Energy in the kinetic store = Mass x Speed^2 / 2

Question 12

The formula for Elastic Energy / Potential

Answer 12

Ke^2
______
2