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In which scenario would the frictional force be zero?

Practice Questions

Q1
In which scenario would the frictional force be zero?
  1. A block sliding down a frictionless ramp.
  2. A block at rest on a flat surface.
  3. A block moving on a rough surface.
  4. A block in free fall.

Questions & Step-by-Step Solutions

In which scenario would the frictional force be zero?
  • Step 1: Understand what friction is. Friction is a force that opposes motion between two surfaces in contact.
  • Step 2: Identify when friction occurs. Friction happens when two objects touch each other.
  • Step 3: Recognize that friction can be zero. Friction is zero when there is no contact force between the objects.
  • Step 4: Consider an example. Imagine a block sliding down a ramp that is perfectly smooth (frictionless).
  • Step 5: Conclude that in this example, there is no friction because the block is not touching anything that creates resistance.
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