Category 1
Name six simple machines
Pulley, Lever, Wheel and axle, Wedge, Inclined Plane, Screw.
When a teacher pulls her map down, what simple machine is she using ?
Wheel and axle
What is an example of a inclined plane ?
Ramp and ladder.
A simple machine that is used to open a door using a doorknob ?
Wheel and axle.
What is a pulley ?
A wheel with a grooved rim around which a cord passes.
Why are they called simple machines ?
Because they make things easier to do.
What are simple machines ?
A machine is a tool that helps us move a load by applying less force. The force applied is called effort.
What is an example of a wheel and axle ?
Doorknob and steering wheel.
What is an example of a Class-2 lever ?
Opening a bottle using a bottle opener.
What is an inclined plane ?
A machine consisting of a sloping surface, used for raising heavy bodies.
How is work measured ?
Work = Force x Distance
What is a screw ?
A screw is a simple machine which is a modified inclined plane that winds around a cylindrical core to form a spiral.
What type of simple machine that can be used to load a truck with boxes of goods ?
Inclined plane.
What is an example Class-3 lever ?
Catching a fish using a fishing rod.
What is a wedge ?
An object that tapers to a thin edge.
What is the most useful simple machine ?
Inclined Planes
Name the three parts of a lever.
Effort, load and fulcrum.
what simple machine is a cut fruit ?
Wedge.
What is an example of a pulley ?
Blinds on windows.
What is a wheel and axle ?
A simple lifting machine consisting of a rope which unwinds from a wheel on to a cylindrical drum or shaft joined to the wheel to provide mechanical advantage.
Who made the first simple machine ?
Archimedes, a Greek philosopher
Why a wheel cannot be used as a machine without an axle ?
A piece of rod passing through the centre of a wheel is called an axle. The axle supports the wheel and allows the wheel to turn on the same axis. Without an axle, a wheel cannot be used as a machine.
What is an example in the human body where a class-one lever is found ?
The joint between the skull and the vertebral column. The vertebral column is the fulcrum.
What is an example of a screw ?
Circular stairways.
When was the wheel created ?
3500 B.C.