Machines
Physics ⇒ Mechanics
Machines starts at 6 and continues till grade 12.
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See sample questions for grade 10
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 lever is used to lift a load of 200 N by applying an effort of 50 N. What is the mechanical advantage of the lever?
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.
A ramp is 4 m long and 1 m high. What is the mechanical advantage of the ramp?
A screw jack has a velocity ratio of 20 and an efficiency of 40%. What is its mechanical advantage?
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.
Name the three classes of levers and give one example of each.
State the law of conservation of energy as it applies to machines.
State the principle of moments as applied to levers.
The efficiency of a machine is 75%. If the input work is 200 J, what is the output work?
The work input to a machine is 500 J and the work output is 400 J. Calculate the efficiency of the machine.
