Machines
Physics ⇒ Mechanics
Machines starts at 6 and continues till grade 12.
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See sample questions for grade 11
A block and tackle system with 4 pulleys is used to lift a load. If the effort applied is 200 N, what is the maximum load that can be lifted, assuming 100% efficiency?
A lever has an effort arm of 2 m and a load arm of 0.5 m. What is its ideal mechanical advantage?
A lever is used to lift a 500 N load with an effort of 100 N. What is the mechanical advantage of the lever?
A machine has a mechanical advantage of 3 and an efficiency of 60%. What is its velocity ratio?
A machine has a velocity ratio of 8 and an efficiency of 75%. What is its mechanical advantage?
A machine has an input work of 200 J and an output work of 150 J. What is its efficiency?
A machine requires an input force of 50 N to lift a 200 N load. What is the mechanical advantage?
A ramp 5 m long is used to raise a load to a height of 1 m. What is the ideal mechanical advantage of the ramp?
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.
