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WorksheetsGrade 8
Total questions: 26
Worksheet time: 13mins
Machines help us to make work:
easier
difficult
complex
Simple machines have
Few moving parts
No moving parts
Many moving parts
The purpose of a simple machine is to:
Test force
Make work easier
Use more force
A machine that is a combination of two or more compound machines is:
Simple machine
Compound machine
Complex machine
A crane is an example of a:
It's not a machine
Simple machine
Mechanical system
An example of a compound machine is
Wheelbarrow
Aeroplane
Car
An example of complex machine is
Aeroplane
Bicycle
Car
Calculate the mechanical advantage in using the lever to move the car if the car weighs 9000N, the effort force is 300N.
3
30
300
the ability to do work
Work
Energy
Force
a push or a pull.
Work
Energy
Force
The energy is only of one kind.
True
False
Worker using the boxes is using mechanical energy.
True
False
Oil is added to a car engine to prevent friction between the moving parts.
True
False
When you rub your hands together the friction does not causes anything
True
False
a force that resists the movement between two surfaces that are sliding or trying to slide against each other
Torque
Friction
Fulcrum
a point around which something can rotate or turn
Pivot
Friction
Fulcrum
What is the missing word in the label
Pivot
Effort
Friction
The wheel and axle has two basic parts: a large disc or wheel that is attached to a smaller cylinder or axle
True
False
the axle rotates to move the load.
True
False
The teeth of the gear wheels are precisely cut so that each wheel interlinks with another smoothly.
True
False
The smaller gear is called the driving gear.
True
False
The larger gear is called the pinion.
True
False
Graphical
Command Line
Graphical
Command Line
What is the correct code for line 1 shown above?
from Tkinter import *
from tkinter import *
from Tk() import *
What is the correct code for line 2 shown above?
tK()
Tk()
tk()
