Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
The static friction force has been exceeded by the gravitational force.
B
The kinetic friction force is stronger than the static friction force.
C
The weight of the object has decreased below the threshold for static friction.
D
The surface has become smoother, reducing friction.
Understanding the Answer
Let's break down why this is correct
Answer
The object starts to slide when the force pulling it down the surface becomes larger than the maximum static friction that can hold it. Static friction is equal to the coefficient of static friction times the normal force, which for a 270‑gram weight is \(mg\). If the slope or the surface is such that the downslope component of gravity exceeds this frictional force, the object can no longer stay at rest. For example, a 270‑gram block on a 30° incline with a static friction coefficient of 0. 3 will have a downslope force of about 1.
Detailed Explanation
The object starts moving when the downward pull from gravity is stronger than the maximum static friction that keeps it still. Other options are incorrect because Many think kinetic friction is higher than static friction, but it is usually lower or equal; The weight of the object does not shrink when it slides.
Key Concepts
Friction Forces
Weight and Motion
Static vs. Kinetic Friction
Topic
Friction Forces Analysis (Part 3)
Difficulty
medium level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1A block is placed on a surface and begins to slide when a force of 270 grams is applied. How would you classify the type of friction acting on the block at this moment?
easyPhysics
Practice
2
Question 2If an object is resting on a surface and begins to slide at a weight of 270 grams, what can you infer about the static friction coefficient between the object and the surface?
easyPhysics
Practice
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