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Energy, Work, and Simple Machines Review Flashcards | StudBud
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Energy, Work, and Simple Machines Review
Energy, Work, and Simple Machines Review
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StudBud Administration
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Work, Forces, Simple Machines, Electricity, Magnetism
Flashcards
33 cards
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Answers
1
In which situation is work NOT being done?
a boy pushes the mower across the lawn
a mover pulls a box to the other side of the room
a girl holds the grocery bag for her father
students move their desks into a circle
2
The object pictured below could best be described as a
wedge
fulcrum
wheel and axle
screw
3
Which energy transformation occurs in an electric motor?
kinetic to electrical
electrical to kinetic
electrical to thermal
potential to kinetic
4
How do simple machines help us do the work?
increase the amount of work done
decrease the input force
decrease the distance
decrease the amount of the work done
5
What type of simple machine is pictured below?
screw
inclined plane
pulley
wedge
6
According to the law of conservation of energy, the total amount of energy in the universe:
increases
remains constant
decreases
changes constantly
7
An example of a real-life lever might be
calendar
knige
crowbar
doorbell
8
An example of a wedge you use a lot might be
a pair of scissors
a clock
spoon
a doorstopper
9
An electromagnet is produced by running an electric current through a coil of wire.An iron core
the strength of the electromagnet would decrease
the electromagnet would no longer conduct electricity
the electromagnet would no longer have magnetic properties
the strength of the electromagnet would increase
10
A __________ is the object pictured below
screw
wedge
pulley
lever
11
Which simple machine is in the hammer shown below
screw
pulley
wheel
lever
12
If you exert a force of 20 N to push a desk 10 m, how much work do you do? (W = F x d)
30 Joules
100 Joules
200 Joules
10 Joules
13
How is an electromagnet different from a permanent magnet?
its magnetic field can be turned off
it has north and south poles
its poles cannot be reversed
it attracts magnetic substances
14
What type of electric circuit is shown in the diagram below?
series circuit
not an electrical circuit
parallel circuit
open circuit
15
A toy helicopter's blades spin when its circuit is connected to a battery. Energy changes are:
electrical-mechanical-potential
heat-mechanical-sound
chemical-electrical-potential
chemical-electrical-kinetic
16
A fulcrum is the _____________________
none of the above
the point in which a lever rotates
type of compound machine
a form of screw
17
Which energy transformation occurs in a generator?
kinetic to electrical
electrical to kinetic
electrical to thermal
potential to kinetic
18
Which is an example of mechanical energy?
moving a box across a floor
the fire from the burner of a stove
green plants making their own food
the flow of energy from a hot pan to your hand
19
How do simple machines help us do the work?
decrease the amount of the work done
increase the input force
decrease the input force
increase the amount of work done
20
Most sports equipment (hockey stick, baseball bat, golf club) are examples of __________
inclined plane
lever
screw
wedge
21
What type of simple machine is pictured below
wheel and axle
lever
inclined plane
screw
22
How can a simple machine change the force needed to perform work?
it decreases the amount of input force and the distance
it decreases the amount of input force & increases distance
it can decrease the input force over the same distance
is can remove the need for an input force
23
The object pictured below could best be described as ______
pulley
inclined plane
wheel and axle
lever
24
What is pictured below (electrical energy to mechanical kinetic energy)
an insulator
a generator
a resistor
a simple electric motor
25
Terry used a ramp to load boxes on a truck. For the work he had to do, the ramp decreases _____
the force he had to apply
the time it took to load the boxes
the distance he had to travel
the height he had to travel
26
What does DC stand for?
direct current
double current
dead current
domain current
27
Which type of simple machine is shown in the diagram below?
wheel and axle
pulley
wedge
lever
28
A simple machine makes work easier by ________________
increasing the effort needed to move an object
reducing the force needed to move an object
moving objects to a higher level
pushing objects apart
29
An output force is exerted by ___________________
a machine
you
30
Which device transforms electrical energy into radiant (light) energy?
light bulb
door bell
toaster
fan
31
Which of the following is NOT necessary to make a simple circuit?
power source (battery)
regulator (fuse)
conductor (wire)
device that transforms electrical energy (fan)
32
What is the force of attraction or repulsion of magnetic materials called?
electromagnet
magnetic field
magnet
magnetism
33
What type of materials lets SOME electrons move through it?
conductors
insulators
resistors
regulators
