HP 6-2 Work and Power
Presentation
•
Physics
•
9th - 12th Grade
•
Easy
+1
Standards-aligned
g Custer
Used 7+ times
FREE Resource
8 Slides • 21 Questions
1
6-2 Explain: Work and Power
Mr. Custer's Physics
Today's
Date
Add this Header in your Lab Notebook!
Learning Objectives
Define Work.
Identify forces that are doing Work.
2
Poll
It is possible to get more Work out of a machine than you put in it.
Yes
No
Sometimes
3
Poll
Simple Machines make Work easier.
Yes
No
Sometimes
4
Poll
Which of these situations involves more Work being done?
Walking up three sets of stairs to get to CSSM.
Taking the elevator to get up to CSSM.
The same amount of Work is being done.
5
Poll
If you push against a School Bus until you are exhausted, but the bus didn't move anywhere, did you do any Work?
Yes
No
Sometimes
6
A transfer of Energy that involves a Force applied through a distance.
What is Work?
No Motion means
No Work!
When applying a Force, not all components do Work.
7
Examples of Work being done
8
Examples of No Work being done
9
Multiple Choice
When the distance an object moves is zero, the work done on the object is also zero.
10
Multiple Choice
You push against the back of your friends car that is stuck. You push and become very tired, but the car does not move. Did you do Work?
Yes, work was done.
No, work wasn't done.
11
Multiple Choice
A student sleeps in class.
A student pushes a locked door that does not open.
A student carries his chair into another room.
A student sits on the carpet.
12
How many Newtons of force did you apply in the direction of motion?
13
Multiple Choice
What would 54 N be an example of?
work
distance
force
energy
14
Multiple Choice
What would 14,000 J be an example of?
work
time
force
15
Multiple Choice
What would 15 m be an example of?
work
force
time
distance
16
Multiple Choice
A 5,000 N block is lifted 10 m. How much work was done?
50,000 J
5,000 J
17
Multiple Choice
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 meters in 10 seconds. How much Work was done?
100 J
6,000 J
3,600 J
60 J
18
Multiple Choice
19
20
(no, that's not a question)
Watt is the unit of Power
21
Multiple Choice
Power is defined as __________.
force times distance
force divided by time.
work divided by time.
work times time.
force times time
22
Multiple Choice
23
Multiple Choice
An Xbox consumes 15.7 Watts while in standby mode. If you leave it in standby mode for one day (86,400 seconds), how much energy is consumed? (How much Work was done)?
.000018 J
5,503.18 J
24
Any Questions before a Five-Question Quiz?
25
Multiple Select
What two things are required for work to be done? Select both.
Force is Applied
Moves a Distance
Stays at a Constant Speed
Experiences Friction
Remains Motionless
26
Multiple Choice
Consider the system of a block of wood and Earth. Identify the situation in which a force does positive work on an object in the system described.
A block of wood is held in place against a wall with a large normal force.
A block of wood is slowing down because of a frictional force.
A block of wood is sitting on a scale, and its weight is measured to be 25 newtons.
A block of wood is pushed across a tabletop by a student.
27
Multiple Choice
A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has she done?
600 J
450 J
900 J
1200 J
28
Multiple Choice
50 J of work is done lifting a 20.0 N book in the air. How high was it lifted?
2.5 m
3.5 m
0.4 m
25 m
29
Multiple Choice
You do 90 Joules of work in 30 seconds. How much power have you generated?
6-2 Explain: Work and Power
Mr. Custer's Physics
Today's
Date
Add this Header in your Lab Notebook!
Learning Objectives
Define Work.
Identify forces that are doing Work.
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