القوى والحركة: أنواع الروافع

Levers are simple machines that make tasks easier by amplifying force. They consist of a rigid arm and a fulcrum. Levers are used in heavy tasks to reduce effort. An example is using a lever to move a large rock, where the lever acts as the arm, the rock as resistance, and a small stone as the fulcrum. The closer the fulcrum is to the resistance, the less effort is needed.

What are the two main components of a lever?

• A screw and inclined plane

• A rigid arm and fulcrum

• A pulley and rope

• A wheel and axle

How does a lever make heavy tasks easier?

• By increasing the weight of the object

• By reducing the distance to move the object

• By amplifying the force applied

• By changing the direction of the force

In the example of moving a rock, what role does the small stone play?

• It is the effort applied

• It serves as the fulcrum

• It is the lever itself

• It acts as the resistance

What happens when the fulcrum is closer to the resistance?

• The lever becomes longer

• The resistance becomes heavier

• The effort required decreases

• The effort required increases

Which of the following best describes the relationship between effort and fulcrum position?

• Effort is independent of fulcrum position

• Effort increases as the fulcrum moves away from the resistance

• Effort is maximum when the fulcrum is at the center

• Effort decreases as the fulcrum moves closer to the resistance