Question

A ________ is used to lift heavy objects.

• A. Lever
• B. Wheel
• C. Pulley
• D. Knife

Answer 1

Answer: (A), (C)

The correct options are
A Lever
C Pulley

$\text{Solution}:$

1. A lever works by reducing the amount of force needed to move an object or lift a load.

2. A lever does this by increasing the distance through which the force acts. Instead, they make the work easier by spreading out the effort over a longer distance

3. A pulley with one wheel allows you to reverse the direction of your lifting force by pulling down on a rope (that's looped over the wheel), lifting your weight.

4. With a two-wheel pulley, you reduce the effort you exert to lift the same amount of weight. You lift the weight with half the force.

$\text{Hence A and B are the correct option}$