Machines
Physics ⇒ Mechanics
Machines starts at 6 and continues till grade 12.
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See sample questions for grade 12
Define velocity ratio in the context of machines.
Describe the difference between actual mechanical advantage and ideal mechanical advantage.
Describe the purpose of using compound machines.
Explain the significance of the velocity ratio being greater than the mechanical advantage in real machines.
A block and tackle system with 4 pulleys is used to lift a load. If the effort moves 2 m and the load moves 0.5 m, what is the velocity ratio?
A machine has a velocity ratio of 6 and an efficiency of 50%. What is its mechanical advantage?
A machine requires an input force of 50 N to lift a 120 N load. What is its efficiency if the velocity ratio is 3?
A ramp 5 m long is used to raise a load to a height of 1 m. What is the velocity ratio of the inclined plane?
Which class of lever has the load between the fulcrum and the effort?
(1) First class
(2) Second class
(3) Third class
(4) None of the above
Which of the following best describes the function of a wedge?
(1) To change the direction of a force
(2) To split or separate objects
(3) To multiply distance
(4) To reduce friction
Which of the following is an example of a third-class lever?
(1) Scissors
(2) Wheelbarrow
(3) Fishing rod
(4) Crowbar
Which of the following is NOT a function of a machine?
(1) Changing the direction of a force
(2) Increasing the amount of work done
(3) Multiplying force
(4) Transferring force to a different point
A screw is a type of _______ machine.
Fill in the blank: The efficiency of a machine is always _______ than 100%.
Fill in the blank: The efficiency of a machine is calculated as (output work / input work) × _______.
Fill in the blank: The point about which a lever rotates is called the _______.
True or False: A pulley system can only be used to lift objects vertically.
True or False: In an ideal machine, mechanical advantage equals velocity ratio.
True or False: The input and output work in a machine are always equal.
True or False: The mechanical advantage of a machine can be less than 1.
