Machines
Physics ⇒ Mechanics
Machines starts at 6 and continues till grade 12.
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See sample questions for grade 10
Define mechanical advantage.
Describe how friction affects the efficiency of a machine.
Explain the term 'velocity ratio' in the context of machines.
Explain why the efficiency of a machine can never be 100%.
Name any two types of simple machines.
A block and tackle system with 4 pulleys is used to lift a load. If the effort applied is 100 N, what is the maximum load that can be lifted, assuming 100% efficiency?
A machine has a mechanical advantage of 5. If the effort applied is 60 N, what is the load lifted?
A machine requires an input force of 80 N to lift a load of 320 N. What is its mechanical advantage?
A pulley system is used to lift a 500 N load with an effort of 125 N. Calculate the mechanical advantage.
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 compound machine?
(1) Pulley
(2) Scissors
(3) Inclined plane
(4) Wedge
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 machine?
(1) To multiply force
(2) To change the direction of force
(3) To increase energy
(4) To multiply speed
The mechanical advantage of a machine is always ________ than its velocity ratio in a real machine.
The point about which a lever rotates is called the ________.
The ratio of output work to input work in a machine is called ________.
True or False: A fixed pulley changes the direction of force but does not provide mechanical advantage.
True or False: In a third-class lever, the effort is applied between the fulcrum and the load.
True or False: The efficiency of a real machine is always less than 100%.
True or False: The output work of a machine can be greater than the input work.
