Bennett Mechanical Comprehension Practice Test 2025 - Free Practice Questions and Review Guide.

When a wheel is turning and undergoing acceleration, it experiences a net force that results in torque, which in turn leads to angular acceleration. Torque is the rotational equivalent of linear force, originating from forces applied at a distance from the axis of rotation.

As the wheel accelerates, the net forces acting on it create this torque, allowing the wheel to increase its speed of rotation. Without these net forces, the wheel would not be able to accelerate; instead, it would remain in its current state of motion according to Newton's first law.

The other scenarios presented do not apply under normal conditions of wheel acceleration. For instance, while friction is indeed present and plays a vital role, it is not the only force acting on the wheel. Gravity's role does not directly oppose the rotational motion in a way that negates acceleration for a standard wheel on a level surface. Finally, the statement that no forces are acting upon the wheel contradicts our understanding of motion, as forces must exist to enable the change in motion indicated by acceleration. Thus, the relationship between net force, torque, and angular acceleration is precisely why this understanding is essential in mechanical comprehension.