work and energy

Question 1

What are some stores of energy?

Answer 1

gravitational potential stores (objects in a gravitational field)

kinetic stores (moving object)

thermal stores

elastic stores (compressed or stretched)

Question 2

What are ways energy is transferred?

Answer 2

radiation

electrically

mechanically

Question 3

What is a joule?

Answer 3

one joule is equal to the energy needed to raise a 1 N weight throguh a vertical heigh of 1 m

Question 4

What is the principle of conservation of energy?

Answer 4

energy cannot be created or destryoed

energy after the transfer is equal to energy before

Question 5

What is work?>

Answer 5

f x distance moved in direction of force

measured in joules - 1 N x 1 m = 1 J

Question 6

What is the equation fro work done on an object moving at an angle of θ?

Answer 6

w = F s cosθ

Question 7

What does the area under a force-distance graph represent?

Answer 7

work done

Question 8

What is the equation to stetch the spring to extension ΔL?

Answer 8

w = 1/2 F ΔL