P8

Question 1

Changes involved in the way energy is stored when a system changes

Answer 1

In a closed system, energy before= energy after change, no net change to total energy in that system.
In open system, energy gets dispersed/dissipated into surroundings.
System-an object.

Question 2

Different ways that the energy of a system can be changed

Answer 2

Through work done by forces.
In electrical equipment.
In heating.

Question 3

work done

Answer 3

force x distance moved in direction of force

Question 4

change in gpe

Answer 4

mass x gfs x change in vertical height

Question 5

kinetic energy

Answer 5

1/2 x mass x (speed)^2

Question 6

how mech processes become waqsteful

Answer 6

when cause a rise in temp so dissioating energy in heating the surroundings

Question 7

power defintition

Answer 7

rate in which energy ias transferred
power= work done/time

Question 8

1 watt=

Answer 8

one joule per second

Question 9

efficiency equation

Answer 9

useful enrgy output/total energy input