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WorksheetsGrade 8 Science Semester 1 Practice Quiz
Total questions: 12
Worksheet time: 11mins
Name
Class
Date
1.
Where will the water go?
a)
Into the cell
b)
Out of the cell
c)
Equally in & out - it's isotonic
d)
There is no water
2.
Identify this simple machine
a)
Lever
b)
Wheel & Axle
c)
Inclined Plane
d)
Screw
3.
What is resistance (output) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
4.
What is effort (input) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
5.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
6.
How can you decrease the effort force needed to push a weight to the top of the ramp?
a)
cover the surface with carpet
b)
increase the length of the ramp
c)
increase the height of the ramp
d)
decrease the length of the ramp
7.
How does a single fixed puled, like the one seen here, help you do work?
a)
changes the direction of the force
b)
increases the amount of applied force
c)
decreases the amount of applied force
d)
allows you to pull the rope a shorter distance
8.
Barbie sits on one end of a see-saw and Ken sits on the other. Barbie goes up in the air and Ken stays down on the ground. In order for Ken to make Barbie move down, he should
a)
stand on the board
b)
push down on the board
c)
move towards the center
d)
move away from the center
9.
To lift a load off the ground, the force required is equal to the weight of the load. In case of a lever, however, a small effort force can be used to lift a much heavier load. How is this possible?
a)
Levers use the weight of the load combined with the effort to lift the load.
b)
Levers combine the weight of the load with the force of gravity to lift the load.
c)
Levers reduce the force required by increasing the distance over which the force is applied.
d)
Levers distribute the load over their length, thereby reducing the force required to lift the load.
10.
Simple machines change the size and __________ of forces.
a)
color
b)
direction
c)
work
d)
property
11.
Wheels, levers, pulleys, ramps, screws, and wedges are forms of _______________________.
a)
potential energy
b)
simple machines
c)
chemical changes
d)
dark matter
12.
A crane uses ___________ to lift heavy loads.
a)
ramps
b)
pulleys
c)
axles
d)
wedges
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