Work, Energy and Power

Question 1

Work done equation

Answer 1

W = f * d

Question 2

Force (y) displacement (x) graphs

Answer 2

Area = work done

Question 3

1 Koike is the work done when a…

Answer 3

…force of 1N moves through a distance of 1m ( in the direction of the force)

Question 4

1 watt is

Answer 4

1 Koike per second

Question 5

Derived equation for power from the equation for work done

Answer 5

P = work done / time take

. ’ . P = (force * displacement ) / time taken

. ‘ . P = F * v

Question 6

The principle of conservation of energy

Answer 6

Energy can be transferred from one form to another but it cannot be created or destroyed.
The total amount of energy always stays the same.

Question 7

Link equation between kinetic energy and momentum

Answer 7

Ek=1/2mv^2
P=mv

Ek= p^2 / 2m

Question 8

If Ek=p^2 / 2m then to double the momentum…

Answer 8

We need 4 times the kinetic energy

Question 9

Elastic collision- total energy is conserved but is Ek?

Answer 9

Total Ek before collision = total Ek after collision

Question 10

Inelastic collision-total energy is conserved but is Ek?

Answer 10

Total Ek before collision > total Ek after collision