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 7
A lever has an input force of 10 N and an output force of 50 N. What is its mechanical advantage?
A lever is used to lift a 100 N load with an effort of 25 N. What is the mechanical advantage?
A pulley system allows you to lift a 200 N load with an effort of 50 N. What is the mechanical advantage?
A ramp is 4 meters long and 1 meter high. What is its mechanical advantage?
A seesaw is an example of which class of lever?
Describe how a wheel and axle works as a simple machine.
Describe the role of friction in the working of machines.
Explain how a pulley makes lifting a load easier.
Explain why a longer handle on a lever makes it easier to lift a heavy object.
Explain why machines do not reduce the total amount of work done.
Name the six types of simple machines.
What is a simple machine?
What is the function of a screw as a simple machine?
What is the main difference between a simple machine and a compound machine?
What is the mechanical advantage of a machine?
A lever is used to lift a box weighing 120 N. If the effort arm is 2 meters and the load arm is 0.5 meters, calculate the effort force required to lift the box, ignoring friction.
A ramp is used to move a 300 N crate to a height of 2 meters. If the ramp is 8 meters long, calculate the ideal mechanical advantage of the ramp.
A student uses a lever to lift a rock. The lever is 1.5 meters long, with the fulcrum placed 0.5 meters from the load. If the student applies a force of 40 N at the end of the lever, what is the maximum load that can be lifted, ignoring friction?
A worker uses a movable pulley to lift a heavy object. If the worker applies a force of 80 N and the object weighs 150 N, what is the efficiency of the pulley system? (Give your answer as a percentage, rounded to the nearest whole number.)
Describe the difference between input force and output force in the context of simple machines, and give an example.