Grade 8 Science – Mechanical Systems Mock Unit Test

Quiz
•
Science
•
8th Grade
•
Hard
Anthony Jones
FREE Resource
73 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ellie is using a simple machine in her science project. It is called "simple" because:
it requires no effort to operate
it performs multiple complex tasks
it consists of one basic mechanism
it's electronically controlled
Answer explanation
A simple machine is termed 'simple' because it consists of one basic mechanism, making it easier to understand and operate compared to more complex machines.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why were simple machines invented?
To create work for engineers
To make tasks easier
To increase force use
To eliminate technology
Answer explanation
Simple machines were invented to make tasks easier by reducing the effort needed to perform work. They help in lifting, moving, and applying force more efficiently, which aligns with the correct answer.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ella is using a seesaw at the park. The pivot point of the seesaw is called the:
axis
joint
load arm
fulcrum
Answer explanation
The pivot point of a lever is called the fulcrum. It is the point around which the lever rotates, allowing the lever to lift or move a load effectively.
4.
DROPDOWN QUESTION
30 sec • 1 pt
Ava needs to lift a flat rock into a pickup truck. The simple machine that would best help her is a (a)
Answer explanation
The load arm is a simple machine that acts as a lever, making it easier to lift heavy objects like a flat rock into a pickup truck by providing a mechanical advantage.
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
William is using an inclined plane to move a heavy box into a truck. A disadvantage of using the inclined plane is:
less effort required
increased travel distance
more complex setup
one-way movement only
Answer explanation
A disadvantage of an inclined plane is the increased travel distance required to move an object up the slope, making it less efficient in terms of distance covered compared to lifting it directly.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Arjun is trying to split a log using a wedge. Why might this method be less efficient?
Wedges require less energy
Wedges increase friction
Greater force over longer distances
Too sharp to be effective
Answer explanation
Wedges can increase friction between surfaces, making it harder to move objects. This added resistance can lead to less efficiency in applying force compared to other tools that minimize friction.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ellie is organizing her garage and comes across several tools and machines. Which of these is not a complex machine?
Blender
Hammer
Bicycle
Lawn mower
Answer explanation
A hammer is a simple machine, consisting of a heavy 'head' attached to a long handle, used for driving nails or breaking objects. In contrast, a blender, bicycle, and lawn mower are all complex machines with multiple moving parts.
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