(1) When you are waiting for your school bus you are doing some work.

(2) In a pulley effort can be applied on any direction.

(3) Our arm is an example of class 1, lever.

(4) A door knob is an example of wheel and axel.

(5) In a proper beam balance, the two arms should be equal.

(6) The common pair of scissors is an example of class 3 lever.

(7) Pedals of cycles are convenient points for application of force.

(8) Pushing a barrel along a ramp is easier than rolling it on the same ramp.

(9) Screws are used to split large pieces of wood.

(10) The fishing rod is actually a class 3, lever.

(2) Arm, tongs, fishing rod, MA more than 1.

(4) Wheel barrow, nutcracker, bottle opener, MA less than 1.

(1) Sewing needle, nail, incisors, beam balance.

(3) Door knob, car steering wheel, screw driver, pulley.

(1) A knife is an example of ____________.

(2) A doorknob is an example of ____________.

(4) The end of the screw is always ____________.

(5) In a class 2, lever the effort arm is always ____________.

(7) In a crowbar the load should be ____________ the pivot.

(8) Nails are the example of ____________.

(10) To lift heavy loads we can use ____________ and ____________.

(3) The incisor tooth acts like a ____________.

(6) A simple pulley has ____________ mechanical advantage.

(9) Woodcutter's axe is an example of ____________.

(4) What is fulcrum in a lever?

(6) What is ‘law of the lever’?

(9) What is the mechanical advantage of a ‘fixed pulley’?

(1) Define simple machine and give one of its application.

(2) Why inclined planes are not made steep?

(3) Machines do not produce energy yet how do they help us?

(5) In a machine effort of 20 kgf is applied to lift a load of 100 kgf ; what is the mechanical advantage?

(7) How can a beam balance be manipulated?

(8) What are the directions of effort and load in a class 2 lever?

(10) Give two examples of ‘wheel and axle.’

(3) When can we say that "work is done"? Explain giving an example.

(6) Explain the functioning of our arm as a kind of lever.

(8) Describe the functioning of a screwdriver.

(1) Enumerate two benefits of simple machines with example.

(2) Describe the three kinds of levers with one example of each.

(4) What is mechanical advantage? Explain with an example.

(5) Explain inclined plane and its application in a screw.

(7) Machines that increase the force of effort have mechanical advantage. Explain giving an example of a class 2, lever.

(9) Explain class 3, lever giving examples.

(10) A load of 600 kgf was lifted by a lever by applying 1/3rd force. Explain what mechanical advantage did the lever provide?

Simple machines do not need energy to do work

Inclined plane

Hundred percent

around which the beam of a lever moves

The load arm should be shorter than the effort arm

More effort is needed to move an object along the ramp

always less than 1

a screw driver

inclined plane wrapped around a cylinder