Question

In a wheel-and-axle :

• A. wheel rotates freely on axle
• B. wheel is fixed to the axle
• C. direction of the force remains same'
• D. mechanical advantage is always more than one

Answer 1

The correct option is B wheel is fixed to the axle

$\text{Solution}:$

1, The wheel and axle is a machine consisting of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other.

2. The wheel and axle can be viewed as a version of the lever, with a drive force applied tangentially to the perimeter of the wheel and a load force applied to the axle, respectively, that are balanced around the hinge which is the fulcrum.

3. Wheel is fixed to the axle.

$\text{Hence B is the correct option}$