energy transfer and power calculations

Question 1

What is the formula for work done ?

Answer 1

Check formula sheet after reciting .

Question 2

What is the formula for gravitational potential energy

Answer 2

Check formula sheet after reciting .

Question 3

What is gravitational field strength?

Answer 3

Uusually given in question , but —->9.8(N/KG ) oherwise .

Question 4

How do you work out weight ?

Answer 4

Weight =mass*gravitational field strength (9.8(N/Kg)

Question 5

What is the formula for kinetic energy.

Answer 5

Check formula sheet after reciting .

Question 6

How do you turn joules into Kilojoules

Answer 6

divide by 1,000

Question 7

What is the formula for elastic potential energy

Answer 7

Check formula sheet after reciting .

Question 8

How do you convert cm to m ?

Answer 8

divide by 100.

Question 9

What are the two formulas for efficency ?

Answer 9

Check formula sheet after reciting .

Question 10

What is power measured in ?

Answer 10

Watts (W)

formula fo rpower both
power = energytransferred(j)/time
power=workdone) (J))/time(s)

Question 11

What is one Watt ?

Answer 11

One watt is one joule per second - 1W=1J/s - when u do division just go to watts

Question 12

What does time haveto be in power equation ?

Answer 12

in seconds