PHYSICS [1 Mark Question Answer]

Output energy is defined as the work done by a machine. The work done by the lever to lift the load is output energy.

Input energy is defined as the work done on a machine. If we apply force on one end of a lever and the load is lifted from another end, the work done by us is input energy.

The perpendicular distance between the point or the axis of rotation and the point at which the efforts acts is known as an effort arm.

The fulcrum is the fixed point on the rigid bar about which the machine (lever) can turn. It means the support about which the lever turns.

The weight lifted by a machine is called Load. It is denoted by ‘W’.

The effort is an applied force to bring desired change to the position (push or lift) of the load.

Six types of simple machines are Lever, Pulley, Inclined plane, Wedge, Screw, Wheel, and Axle.

A device that helps lift a heavy load, speed up motion, or change the direction of the force in the desired direction is called a machine.

The ratio between output energy and input energy is called efficiency of machine.

The force applied on a machine to do some mechanical work is called pressure.

An ideal machine is impossible in real life.

A machine which lifts more load than effort applied has mechanical advantage efficiency more than 1.

The resistance overcome by a machine is called load.