Machines
Physics ⇒ Mechanics
Machines starts at 6 and continues till grade 12.
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See sample questions for grade 9
Describe the difference between actual mechanical advantage and ideal mechanical advantage.
Describe the function of an inclined plane.
Describe the main purpose of using a machine.
Explain why friction reduces the efficiency of a machine.
Explain why no machine is 100% efficient.
Name two examples of a wedge used in everyday life.
A pulley system is used to lift a load of 500 N. If the system has an efficiency of 60% and the effort applied is 150 N, calculate the distance moved by the effort if the load is raised by 2 m.
A student uses a ramp to push a box weighing 200 N up to a height of 2 m. The length of the ramp is 8 m. If the student applies a force of 60 N to move the box up the ramp, calculate the efficiency of the ramp.
Which class of lever has the fulcrum between the effort and the load?
(1) First class
(2) Second class
(3) Third class
(4) Fourth class
Which of the following is a function of a wedge?
(1) To hold objects together
(2) To split or cut objects
(3) To change the direction of force
(4) To increase speed
Which of the following is a second class lever?
(1) Scissors
(2) Wheelbarrow
(3) Fishing rod
(4) Crowbar
Which of the following is an example of a third class lever?
(1) Nutcracker
(2) Human arm
(3) Seesaw
(4) Pliers
Fill in the blank: A ________ is a wheel with a grooved rim in which a rope can run to change the direction of the force applied.
Fill in the blank: The ________ is the force applied to a machine.
Fill in the blank: The mechanical advantage of a machine is the ratio of ________ to ________.
Fill in the blank: The point about which a lever rotates is called the ________.
Is a bicycle an example of a complex machine?
Is a crowbar an example of a first class lever?
Is a pair of scissors an example of a compound machine?
Is it possible for a machine to have an efficiency greater than 100%?
