Force and Work Unit Test
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Question
Use the diagram of the pulley system to complete the statement.
An illustration shows a system of two pulleys lifting a block.
In this pulley system, the pulleys will _____ the mechanical force required to lift the block and will change the _____.
(1 point)
Responses
increase; direction of the force
increase; direction of the force
decrease; direction of the force
decrease; direction of the force
decrease; weight of the block
decrease; weight of the block
increase; weight of the block
increase; weight of the block
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increase; direction of the force
Force and Work Unit Test
3 of 123 of 12 Items
Question
Which list correctly orders effort (E), fulcrum (F), and load (L) for each lever class?(1 point)
Responses
class 1 = F, E, L (or L, E, F)
class 2 = L, F, E (or E, F, L)
class 3 = F, L, E (or E, L, F)
class 1 = F, E, L (or L, E, F) class 2 = L, F, E (or E, F, L) class 3 = F, L, E (or E, L, F)
class 1 = L, F, E (or E, F, L)
class 2 = F, L, E (or E, L, F)
class 3 = F, E, L (or L, E, F)
class 1 = L, F, E (or E, F, L) class 2 = F, L, E (or E, L, F) class 3 = F, E, L (or L, E, F)
class 1 = F, L, E (or E, L, F)
class 2 = F, E, L (or L, E, F)
class 3 = L, F, E (or E, F, L)
class 1 = F, L, E (or E, L, F) class 2 = F, E, L (or L, E, F) class 3 = L, F, E (or E, F, L)
class 1 = F, E, L (or L, E, F)
class 2 = F, L, E (or E, L, F)
class 3 = L, F, E (or E, F, L)
class 1 = F, E, L (or L, E, F) class 2 = F, L, E (or E, L, F) class 3 = L, F, E (or E, F, L)
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class 1 = F, E, L (or L, E, F)
class 2 = L, F, E (or E, F, L)
class 3 = F, L, E (or E, L, F)
Force and Work Unit Test
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Question
How do simple machines make work easier?(1 point)
Responses
They decrease the distance needed between a person and an object, allowing the person to apply more force and do more work.
They decrease the distance needed between a person and an object, allowing the person to apply more force and do more work.
They increase the distance over which a force is needed, doing more work with less force.
They increase the distance over which a force is needed, doing more work with less force.
They magnify the force being applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
They magnify the force being applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
They reduce the amount of force needed to move an object to do the same amount of work.
They reduce the amount of force needed to move an object to do the same amount of work.
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They reduce the amount of force needed to move an object to do the same amount of work.
A person using a lever applies 98 Newtons to lift a 20-kilogram box. They apply the force over a distance of 4 meters to lift the box a distance of 2 meters. How much work is done?(1 point)
Responses
392 Joules
392 Joules
80 Joules
80 Joules
196 Joules
196 Joules
40 Joule
The work done can be calculated using the formula:
Work = Force x distance
Given:
Force = 98 Newton
Distance = 4 meters
Work = 98 Newton x 4 meters = 392 Joules
Therefore, the correct answer is:
392 Joules
A person is lifting a heavy box using a lever. What is the purpose of the lever in this situation?(1 point)
Responses
to reduce the force needed to lift the box and change the direction of the force
to reduce the force needed to lift the box and change the direction of the force
to reduce the energy needed to lift the box and change the direction of the force
to reduce the energy needed to lift the box and change the direction of the force
to reduce the force needed to lift the box while keeping the direction of the force the same
to reduce the force needed to lift the box while keeping the direction of the force the same
to reduce the energy needed to lift the box while keeping the direction of the force the same
to reduce the force needed to lift the box while keeping the direction of the force the same
Force and Work Unit Test
7 of 127 of 12 Items
Question
Use the image of a person lifting a boulder with a lever to answer the question.
An illustration shows a man using a stick and a small rock as a lever to lift a large rock.
Where is the fulcrum in this situation?
(1 point)
Responses
It is the point where the boulder touches the ground.
It is the point where the boulder touches the ground.
It is the point where the person’s hands push down on the bar.
It is the point where the person’s hands push down on the bar.
It is the point where the bar touches the smaller rock.
It is the point where the bar touches the smaller rock.
It is the point where the bar touches the boulder.
It is the point where the bar touches the boulder.
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