Keshu

1. Definition

• Simple machines are basic tools/mechanical devices that help us do work with less effort.

• They don’t create energy, they just change how we apply force (direction, magnitude, or distance).

2. Types

The six classical simple machines are:

1. Lever

2. Inclined plane

3. Wheel and axle

4. Pulley

5. Wedge

6. Screw

(All other machines are made by combining these.)

3. Work

• In Physics, Work = Force × Distance

• Simple machines don’t reduce the total work; they just make it easier.

• Example: Lifting a box straight up vs. pushing it up a ramp → Work done is the same but the ramp requires less force.

4. Pulley Systems

• Pulley: A wheel with a rope passing over it.

• Fixed Pulley: Changes the direction of force only (no force reduction).

• Movable Pulley: Reduces effort by sharing the load.

Inclined Plane (Easy Version)

• It’s just a sloping surface that helps lift heavy things.

• Instead of lifting straight up, you push/pull over a slope with less force.

👉 Example: pushing a box up a ramp is easier than lifting it directly.

the formula is on my note book