subject

Machines

Physics ⇒ Mechanics

Machines starts at 6 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Machines. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 9
A block and tackle system has 4 supporting ropes. What is its ideal mechanical advantage?
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 60 N load with an effort of 20 N. What is the mechanical advantage of the lever?
A machine has an input force of 50 N and an output force of 200 N. What is its mechanical advantage?
A machine requires an input force of 30 N to lift a load of 90 N. What is the mechanical advantage?
A pulley system is used to lift a 100 kg load. If the system has a mechanical advantage of 5, what is the minimum input force required? (Take g = 10 m/s²)
A ramp is 5 m long and 1 m high. What is the ideal mechanical advantage of the ramp?
A wheel and axle has a wheel radius of 40 cm and an axle radius of 10 cm. What is its ideal mechanical advantage?
Describe the difference between actual mechanical advantage and ideal mechanical advantage.
Describe the function of an inclined plane.
Describe the main purpose of using a machine.
Explain why friction reduces the efficiency of a machine.
Explain why no machine is 100% efficient.
Name two examples of a wedge used in everyday life.
The efficiency of a machine is 80%. 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 350 J. Calculate the efficiency of the machine.
Which simple machine is used in a screw?
A compound machine combines two or more simple machines. Give one example of a compound machine and name the simple machines it contains.
A lever is used to lift a 120 N load by applying an effort of 40 N. If the distance from the fulcrum to the load is 0.3 m, calculate the distance from the fulcrum to the point where the effort is applied.
A machine has an efficiency of 75%. If the output work is 150 J, what is the input work?