Work Energy and power

Question 0

How do you work out work done?

Answer 0

W=F x s x cos(@)

Work done =Force x displacement x cos(theta)

Question 1

What is work done and what is it measured in

Answer 1

Work done = energy transferred

Measured in joules, J

Question 2

Define power …

Answer 2

The rate of energy transferred per second.

Question 3

Power is measured in …

Answer 3

Watts

Question 4

What is one watt equal to ?

Answer 4

1 joule per second.

Question 5

The equation for power using w is

Answer 5

Power = change in work done / change in time.

P= w/t

Question 6

The equation for kinetic energy is …

Answer 6

1/2mv^2

Question 7

The equation for power of a moving object is …

Answer 7

P=FV

Question 8

What does the principle of conservation of energy state?

Answer 8

Energy can not be created or destroyed only transfers from one form to another.

Question 9

Energy can not be created of destroyed only transferred to another form, what is this?

Answer 9

The principle of conservation of energy.

Question 10

The efficiency of a system can be calculated using energy by the equation….

Answer 10

Efficiency= useful energy given out / total energy input

X100

Question 11

What is the equation for efficiency of a system using power?

Answer 11

Efficiency = useful powerful output/ power input.

Question 12

Change in gravitation potential energy is given by the equation …

Answer 12

M x g x change in height

Question 13

Fill the blank
1/2_v^2 = _gh
What is this saying?

Answer 13

M
Gravitation potential = Kinetic
When ignoring resistive forces.