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Week 21 HW physics Flashcards | StudBud
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Week 21 HW physics
Week 21 HW physics
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1
Which of the following is an example of the scientific definition of work?
Memorizing multiplication tables
Picking up a stack of books
Walking with a heavy box
Writing a computer program
2
What are the units of measurement for work?
Hertz
Meters
Watts
Joules
3
A closed system is...
When there are external forces acting on an interaction
When there are no external forces acting on an interaction
An explosion
When two objects get stuck together after colliding
4
Can work be negative?
No
I don't know
Yes
Sometimes
5
Using the scientific definition of work, what is the best example of work being done?
A rocket drifting through space
A car being towed down the street
Lamp hanging from a ceiling
a man pushing against a concrete building
6
The scientific definition of "work" means...
using machines
completing homework
using force to make a change
experimenting
7
Which of these is an example of the scientific definition of work?
Kara watched a ball roll by.
Bob pushes on a wall.
Tara lifts a box.
Jon thinks about a math problem.
8
Which is an example of the scientific definition of work?
Holding a really large baby in your arms
Pushing a donkey into the barn
Being a teacher
Concentrating really hard when doing your homework
9
What is the formula for calculating work?
Speed x time
Energy x power
Mass x acceleration
Force x distance
10
Mechanical energy is -
a combination of potential and kinetic energy
travels in waves
heat energy
a flow of electrons
11
Which is NOT an example of work, according to the scientific definition of work?
studying a page of science notes for 3 hours
kicking a soccer ball
hitting pins with a bowling ball
hiking on a trail while pushing a stroller
12
An example of the scientific definition of work is:
moving a chair
homework
hmmm....
not doing anything
13
Which of the following can mechanical energy be changed into?
light energy
electric energy
all of these are correct
thermal energy
14
Work energy Theorem
the amount of work done on an object < change in KE
the amount of work done on an object = change in KE
the amount of work done on an object > change in KE
None are correct
15
What is the SI unit of power?
Joules
Watts
Amps
Volts
16
What is power defined as?
The force applied
The energy consumed
The amount of work done
The rate of doing work
17
Which of the following examples best demonstrates the
work-kinetic energy theorem
?
A mother at rest holding her baby
A car slowing down to a stop.
A man with a large hat
A ball moving at 20 m/s
18
Which is an example of mechanical energy?
green plants making their own food
the fire from the burner of a stove
pushing a box across the floor
the flow of energy from a hot pan to your hand
19
What is the equation for calculating force?
Energy x power
Work / time
Mass x acceleration
Force x distance
20
Mechanical Energy =
PE2
Potential Kinetic Energy
KE + PE / 2
KE + PE
