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Friction Forces Analysis (Part 3)
easy

When attempting to push a stationary object across a surface, which factor is most crucial in determining whether the object will start to move?

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Learning Path
Learning Path

Question & Answer
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Choose the Best Answer

A

The coefficient of static friction between the object and the surface

B

The weight of the object

C

The surface area of contact between the object and the surface

D

The color of the object

Understanding the Answer

Let's break down why this is correct

Answer

The most important factor is the maximum static friction force that resists the start of motion. This force equals the coefficient of static friction multiplied by the normal force pressing the object onto the surface. If the applied push is weaker than this value, the object stays still; if it exceeds the value, the object begins to slide. For example, a 10‑kg box on a floor with a static‑friction coefficient of 0. 4 has a maximum static friction of 39.

Detailed Explanation

The amount of static friction decides how much push is needed. Other options are incorrect because Weight only pulls the object down; The size of the contact patch does not change how much force is needed to start movement.

Key Concepts

Static Friction Coefficient
Topic

Friction Forces Analysis (Part 3)

Difficulty

easy level question

Cognitive Level

understand

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