Physics-Energy And Work

Question 0

Work =

Answer 0

Force* distance

Question 1

Work

Answer 1

Measure of amount of E used in moving object

Question 2

Power

Answer 2

rate that works done

P = work done/time

Question 3

KE

Answer 3

Energy of moving object

Ek = 0.5mv^2

Question 4

Double mass of moving object

Answer 4

double KE

Question 5

Double velocity =

Answer 5

KE increase by factor of 4

Question 6

Travelling at higher speeds =

Answer 6

Need longer distance to stop

Question 7

PE

Answer 7

E possessed by an object due to position or structure

• gives capacity to do work

Question 8

Elastic potential energy

Answer 8

Stretched or compressed material has EPE

• converted to KE when released & return of original shape

Question 9

GPE

Answer 9

Energy object has due to its height above ground

GPE = mgh

Question 10

Conservation of energy

Answer 10

E may be transferred from one form to another but never created or destroyed

Question 11

Total energy in system …

Answer 11

Stays the same Et = Ep + Ek

Question 12

Energy

Answer 12

Capability to do work

Question 13

Efficiency of conversion

Answer 13

Measure of how much useful E produced

Question 14

Mechanical E

Answer 14

Sum of PE & KE, always conserved, one goes down, other goes up by same amount, as long as no non conservative factors eg: friction