Work Done

Question 1

what is work done

Answer 1

when a force is applied to an object causing it to move in the direction of the force energy is transferred or converted

Question 2

what is the si unit of work

Answer 2

joules

Question 3

how much energy is needed to do one joule of work

Answer 3

one joule of energy

Question 4

what are the requirements for work to be done

Answer 4

force must act on the object the object must move and movement must be in direction of the force

Question 5

how do you calculate work done

Answer 5

work done equals force multiplied by distance moved in the direction of the force

Question 6

what is a system

Answer 6

an object and its surroundings considered together

Question 7

what happens when work is done by a force on a system

Answer 7

energy is added into the system and converted to other forms

Question 8

what causes change in gravitational potential energy

Answer 8

change in height mass or gravitational field strength

Question 9

what is work done against gravity equal to

Answer 9

change in gravitational potential energy

Question 10

what causes change in kinetic energy

Answer 10

change in mass or speed

Question 11

what happens when object moves with friction or air resistance

Answer 11

work is done against friction or air resistance and energy is converted to thermal or sound energy