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Webb- Forces, Work, and Power Flashcards | StudBud
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Webb- Forces, Work, and Power
Webb- Forces, Work, and Power
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Answers
1
What do Simple Machines do?
Have fun
Make work easier
require a lot of strength
Move stuff around
2
If you exert a force of 20 Newtons to push a desk 10 meters how much work is done on the desk?
30 J
10 J
200 J
100 J
3
All of the following are examples of a force except
watching a movie
putting a flag up the flag pole
a tow truck moving another car
getting pushed on a swing
4
You do work on an object when you lift it off the floor onto a shelf.
True
False
5
What is the common formula for work?
W = Force x distance2
W = Force x velocity
W = Force2 x distance
W = Force x distance
6
Mechanical advantage is the number ...
of times a machine is used to multiply an effort force
of times output is increased
of times input is increased
of times a machine is used repeatedly
7
Which of these is an example of work being done on an object?
holding a heavy piece of wood at a construction site
trying to push a car that doesn't move out of deep snow
holding a door shut on a wondy day so it doesn't blow open
pushing a child on a swing
8
This is the unit for work.
Joule
Watt
second
Newton
9
What are the different simple machines?
Fridge,Stove,Oven,Blender
Pretend this answer isn't here.
Wheel and Axle. Inclined Plane. Wedge. Lever. Pulley. Screw.
Epic Face,MLG Face,Smiley Face,Emoji Face
10
Which of the following is an example of the scientific definition of work?
Memorizing multiplication tables.
Walking while holding a heavy box
Writing a computer program
Picking up a stack of books.
11
Select the 3 statements that are examples of work.
a woman picks up a grocery bag
a father pushes a baby in a carriage
a student plays fortnite
a baseball player throws a ball across the field
12
The formula for calculating work is
Work = Force X Distance
Work = Newtons X Meters
Work = Force / Distance
Work = Newtons / Meters
13
Which of the following is the rate at which work is done?
power
mechanical enegy
kinetic energy
potential energy
14
How much work is being done if an object with a force of 10 N moves 3 meters?
30 J
No work is being done
3.33 J
300 J
15
What is the Mechanical Advantage of the Pulley?
4
2
3
1
16
When you apply a force to an object and it moves in the direction of that force, you have done:
Distance
Work
Time
Power
17
What is the mechanical advantage of this pulley system?
3
2
1
4
18
Work is
not
being done on this object.
A book is lifted vertically from the floor.
A stack of books is carried at waist level across a room.
A book is dropped onto the ground.
A bookcase is slid across carpeting.
19
For work to be done on an object,
the object must move whether or not a force is exerted on it
the object must not move
the object must move some distance as a result of a force
some force need only be exerted on the object
20
The formula for power is: Power = Work X Time
False
True
21
What is the mechanical advantage of the pulley below?
3
1
0
2
22
What is a mechanical advantage?
Joules
Decreasing the force by increasing the distance
motion
meters
23
Power is measured in units called
Joules
Watts
Pounds
Newtons
24
Which activity describes work being done on an object?
pressing a stamp onto an envelope
holding an umbrella still
walking a dog on a leash
lifting a bag of groceries
25
Joule is the rate at which work is done.
True
False
26
In order to do work on an object, the force you exert must be
in the same direction as the object's motion
the maximum amount of force you are able to exert
in a direction opposite to the Earth's gravitational force
quick and deilberate
27
If a tow truck does 1000 J of work in 5 seconds then what is the power being used?
2,000 W
2,000 N
200 N
200 W
28
What is a force?
a push or take
a roll
being tall
a push or pull
29
Mechanical advantage is force
True
False
30
If a force is being exerted on an object, but the object is not moving, is any work being done?
YES
MAYBE
Depends on how heavy the object is
NO
31
What must occur to be performing work in the scientific definition?
Speed and force
Distance of the force applied
Distance from movement of an object
Force applied to cause movement
32
The more force you apply to a moving object, the less work you have actually done.
True
False
33
When calculating WORK, which MUST be true?
The force is perpendicular to the movement (at 90deg angle)
The force is parallel to the movement (same direction)
The object must move
The object cannot move
34
The rate at which work is done or rate at which energy is transferred
Efficiency
Power
Mechanical advantage
Potential
35
What is mechanical advantage?
comparison of energy before and after a conversion
how much work a machine can do
how much a machine multiplies force
comparison of work output to input
