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 12
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 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 velocity ratio of 6 and an efficiency of 50%. What is its mechanical advantage?
A machine has an efficiency of 80%. If the input work is 200 J, what is the output work?
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?
A wheel and axle has a wheel radius of 40 cm and an axle radius of 10 cm. What is its velocity ratio?
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.
Explain why increasing the length of the effort arm in a lever increases its mechanical advantage.
Explain why no real machine can be 100% efficient.
Name two factors that reduce the efficiency of a machine.
State the law of conservation of energy as it applies to machines.
