Machines
Physics ⇒ Mechanics
Machines starts at 6 and continues till grade 12.
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See sample questions for grade 11
A screw is a type of simple machine. What is its main function?
Describe the difference between actual mechanical advantage and ideal mechanical advantage.
Describe the function of a pulley in lifting heavy objects.
Describe the purpose of a wheel and axle as a simple machine.
Explain how friction affects the efficiency of a machine.
Explain why a longer inclined plane makes it easier to lift a load to a certain height.
Explain why no real machine can be 100% efficient.
State the law of conservation of energy as it applies to machines.
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 third-class lever?
(1) Nutcracker
(2) Human arm
(3) Seesaw
(4) Bottle opener
Which of the following is an example of a second-class lever?
(1) Scissors
(2) Wheelbarrow
(3) Fishing rod
(4) Crowbar
Which of the following is NOT a function of a simple machine?
(1) To change the direction of a force
(2) To increase the amount of work done
(3) To multiply force
(4) To multiply speed
Fill in the blank: The _______ is the point about which a lever rotates.
Fill in the blank: The ratio of the distance moved by the effort to the distance moved by the load is called the _______.
The efficiency of a machine is calculated as _______ divided by _______ multiplied by 100%.
The mechanical advantage (MA) of a machine is defined as the ratio of _______ force to _______ force.
True or False: An ideal machine has 100% efficiency.
True or False: Increasing the length of the effort arm in a lever increases its mechanical advantage.
True or False: The input work is always greater than the output work in a real machine.
True or False: The velocity ratio of a machine is always equal to its mechanical advantage.
