Work power energy

Question 1

Describe the differences between positive and negative work

Answer 1

positive work - force added in direction of displacement adds kinetic en

negative work - force being applied in opposite direction is negative work, decrease kinetic en

Question 2

Identify the different types of energy.

Answer 2

Mechanical energy is the ability to do work classified as either:

Kinetic energy (KE) - ability to do work taking into account motion

Potential energy (PE) - ability to do work taking position into account. for instance gravity affect.

Question 3

Explain how energy is transferred or transformed between systems.

Answer 3

when object is on ground and going up, potential en = 0, as go up, some kinetic en get converted to potential en via gravity and then reaches apex. Now kinetic en = 0 and then as object fall, en transferred back to kinetic.

Question 4

what is a joule

Answer 4

1 joule is the force of 1 newton meter over a distance of 1 meter.

Question 5

what is kinetic energy (KE)

Answer 5

ability to do work when moving, velocity and mass influence this. heavier bowling ball can do more work, faster bowling ball can do more work

Question 6

What is power

Answer 6

Power is the rate of work being done

P = force/time

measured in watts (joules per second)

Question 7

mechanical energy (C)

Answer 7

ability to do work