Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Static Friction
B
Kinetic Friction
C
Rolling Friction
D
Fluid Friction
Understanding the Answer
Let's break down why this is correct
Answer
When the applied force reaches 270 g, the block’s static friction has been overcome, so the block starts to move. At that instant the resisting force is no longer static but kinetic (also called dynamic) friction. This type of friction acts on objects that are already sliding, and its magnitude is usually less than the maximum static friction. For example, a 270 g push on a block on a table will cause the block to slide, and the friction opposing the motion will be kinetic friction.
Detailed Explanation
When the block starts to move, the contact force changes to a force that opposes motion. Other options are incorrect because The idea that the block is still at rest is a misconception; Rolling friction is only for wheels or balls that roll.
Key Concepts
Friction Forces
Static vs. Kinetic Friction
Surface Interaction
Topic
Friction Forces Analysis (Part 3)
Difficulty
easy level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1If a block is sliding down an inclined plane, how does the frictional force behave compared to the gravitational force acting parallel to the incline?
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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
3
Question 3If an object begins to slide down a surface at a weight of 270 grams, what could be the underlying reason for this change in motion in terms of friction forces?
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Practice
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