A large rock does not move even when someone applies a significant force when pushing it. What is the cause of this phenomenon?

Rationale

Static friction prevents the rock from moving despite applied force.

Static friction is the force that resists the initiation of sliding motion between two surfaces in contact. It acts on the rock when force is applied, providing the necessary counterforce to keep it stationary until the applied force exceeds the maximum static frictional force.

A (Nonzero velocity) YOUR ANSWER

Nonzero velocity implies that an object is already in motion. In this scenario, the rock is not moving at all; therefore, the concept of velocity does not apply. The presence of a nonzero velocity would indicate that the rock has already overcome any resistive forces, which contradicts the situation described.

B (Constant acceleration) YOUR ANSWER

Constant acceleration would indicate that the rock is changing its velocity over time and thus moving. Since the rock does not move despite the applied force, it cannot be experiencing constant acceleration. Instead, it remains at rest due to the balance of forces acting on it.

C (Kinetic friction) YOUR ANSWER

Kinetic friction acts on moving objects and serves to oppose their motion. Since the rock does not move when force is applied, kinetic friction is irrelevant in this case. The rock is subject to static friction, which prevents it from starting to move in response to the applied force.

D (Static friction) CORRECT

Static friction is responsible for keeping the rock at rest despite the significant force applied. It counteracts the force until it reaches its maximum threshold, beyond which motion would occur. This frictional force is crucial in maintaining the rock's stationary position until the applied force is strong enough to overcome it.

Conclusion

The phenomenon where a large rock does not move when a significant force is applied is due to static friction, which effectively counterbalances the applied force until it exceeds the maximum static friction force. Other options such as nonzero velocity, constant acceleration, and kinetic friction do not apply to the scenario of a stationary object under force. Understanding static friction is essential in explaining why objects remain at rest in the face of applied forces.

A large rock does not move even when someone applies a significant force when pushing it. What is the cause of this phenomenon?

Static friction prevents the rock from moving despite applied force.

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