WORK AND ENERGY

Question 1

what is energy?

Answer 1

the ability to do work (can be kinetic or potential energy)

Question 2

what is the law of conservation of energy?

Answer 2

energy can neither be created nor destroyed

Question 3

what is kinetic energy and what are some examples?

Answer 3

it is associated with motion
eg. mechanical energy, electric energy, thermal energy

Question 4

what is potential energy and what are some examples?

Answer 4

it is associated with an objects position
eg. gravitational potential energy, elastic potential energy, chemical potential energy

Question 5

what is the equation for work?

Answer 5

work = force x distance (W = Fd)

Question 6

how do you calculate energy efficiency?

Answer 6

% efficiency = (KE/PE) x 100

Question 7

what is the equation for solving gravitational potential energy?

Answer 7

gravitational potential energy (J) = mass (kg) x gravity (10 m/s) x height (m)
(G)PE = m g h

Question 8

what is the equation for solving kinetic energy?

Answer 8

kinetic energy = 1/2 x mass x velocity
KE = 1/2 m v (squared)