Pulley

• A pulley is a simple machine — a wheel with a groove that a rope or string runs over.
• A pulley fixed at the top of a well helps lift a water bucket by changing the direction of our pull.
• Pulling downward on a rope over a pulley can lift a load upward, which feels more natural and comfortable.
• Pulleys are used to raise a flag on a flagpole using a rope that runs over a small wheel at the top.
• A pulley mainly makes work easier by changing the direction of the force we apply.

Level 1 - Core idea

Verbal: A pulley is a simple machine made of a grooved wheel with a rope running over it. It changes the direction of the force we apply, so pulling down on the rope can lift a load up.

Symbolic: pull rope downward over pulley wheel -> load moves upward

Visual: Picture a bucket tied to a rope that runs over a wheel fixed above a well — pulling the rope down brings the bucket of water up.

Level 2 - Going deeper

Notice where you see this idea at home, at school, and in your neighbourhood — connecting the concept to daily life makes it easier to remember and use.

Level 3 - NCERT anchor

NCERT EVS Looking Around 4 — chapters on wells and daily water collection show a pulley used to draw water buckets up from a well.

A bucket of water is tied to a rope that passes over a wheel fixed above a well. How does pulling the rope down help?

Step 1 - The rope runs over a fixed, grooved wheel — this is a pulley.
Step 2 - Pulling the rope on one side downward moves the other side upward.
Step 3 - The bucket, tied to the other end, rises out of the well.
Answer: The pulley changes the direction of pull, so pulling down lifts the bucket up.

Why do schools use a rope and small wheel at the top of a flagpole to raise the flag, instead of climbing up?

Step 1 - The wheel at the top acts as a pulley.
Step 2 - Pulling the rope downward at the bottom raises the flag attached at the top.
Step 3 - This avoids the need to climb the pole at all.
Answer: The pulley lets people raise the flag safely by pulling down at ground level.

• What is a pulley?
• How does a pulley help in lifting a bucket from a well?
• What happens to a load when you pull down on a rope over a fixed pulley?
• Name one other place, besides a well, where a pulley is used.
• Stretch: Why might it feel more comfortable to pull a rope downward to lift a flag than to push it upward directly?

Revision tip: Picture a well with a bucket and rope over a wheel — pull down, bucket goes up — whenever you think of a pulley.

Open the Practice tab for graded questions on Pulley.