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2021 Roach/Webb- Forces, Work, and Power Flashcards | StudBud
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2021 Roach/Webb- Forces, Work, and Power
2021 Roach/Webb- Forces, Work, and Power
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1
The formula for power is: Power = Work X Time
True
False
2
This is the unit for work.
Joule
Newton
second
Watt
3
The rate at which work is done or rate at which energy is transferred
Efficiency
Power
Potential
Mechanical advantage
4
Select the 3 statements that are examples of work.
a baseball player throws a ball across the field
a woman picks up a grocery bag
a father pushes a baby in a carriage
a student plays fortnite
5
When calculating WORK, which MUST be true?
The object cannot move
The force is perpendicular to the movement (at 90deg angle)
The object must move
The force is parallel to the movement (same direction)
6
What is mechanical advantage?
comparison of energy before and after a conversion
comparison of work output to input
how much work a machine can do
how much a machine multiplies force
7
The more force you apply to a moving object, the less work you have actually done.
False
True
8
You do work on an object when you lift it off the floor onto a shelf.
True
False
9
If you exert a force of 20 Newtons to push a desk 10 meters how much work is done on the desk?
200 J
30 J
10 J
100 J
10
When you apply a force to an object and it moves in the direction of that force, you have done:
Work
Distance
Power
Time
11
Which of the following is the rate at which work is done?
potential energy
kinetic energy
power
mechanical enegy
12
What is a mechanical advantage?
Joules
Decreasing the force by increasing the distance
meters
motion
13
Which of the following is an example of the scientific definition of work?
Walking while holding a heavy box
Memorizing multiplication tables.
Writing a computer program
Picking up a stack of books.
14
For work to be done on an object,
the object must move some distance as a result of a force
the object must not move
the object must move whether or not a force is exerted on it
some force need only be exerted on the object
15
All of the following are examples of a force except
putting a flag up the flag pole
getting pushed on a swing
watching a movie
a tow truck moving another car
16
What is the common formula for work?
W = Force2 x distance
W = Force x distance
W = Force x distance2
W = Force x velocity
17
In order to do work on an object, the force you exert must be
quick and deilberate
in the same direction as the object's motion
in a direction opposite to the Earth's gravitational force
the maximum amount of force you are able to exert
18
Power is measured in units called
Watts
Newtons
Pounds
Joules
19
Joule is the rate at which work is done.
True
False
20
Which of these is an example of work being done on an object?
pushing a child on a swing
holding a door shut on a windy day so it doesn't blow open
holding a heavy piece of wood at a construction site
trying to push a car that doesn't move out of deep snow
21
The formula for calculating work is
Work = Newtons X Meters
Work = Newtons / Meters
Work = Force / Distance
Work = Force X Distance
22
If a tow truck does 1000 J of work in 5 seconds then what is the power being used?
200 N
2,000 N
2,000 W
200 W
23
Work is
not
being done on this object.
A stack of books is carried at waist level across a room.
A book is lifted vertically from the floor.
A book is dropped onto the ground.
A bookcase is slid across carpeting.
24
What must occur to be performing work in the scientific definition?
Force applied to cause movement
Speed and force
Distance from movement of an object
Distance of the force applied
25
Which activity describes work being done on an object?
holding an umbrella still
walking a dog on a leash
pressing a stamp onto an envelope
lifting a bag of groceries
26
What is a force?
being tall
a roll
a push or pull
a push or take
27
How much work is being done if an object with a force of 10 N moves 3 meters?
300 J
3.33 J
30 J
No work is being done
28
If a force is being exerted on an object, but the object is not moving, is any work being done?
Depends on how heavy the object is
YES
NO
MAYBE
