Trineetra B2C Internal demo

Sample lesson

Dashboard / Sample lesson

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Why a block slides: friction on a ramp

Physics (placeholder subject) · Forces and motion (placeholder chapter)

Lesson progress0% · 0 of 4 complete

Learning objectives

  • Describe the forces acting on a block resting on a slope.
  • Predict whether a block stays still or slides as the slope angle changes.
  • Relate the slipping angle to the coefficient of friction.

Lesson video

Synthetic video preview
Ramp angle ≈ 6°Block is held by friction
Forces on a slopeWeight acts straight down. On a slope it is easier to treat it as two parts: one pressing into the surface, one pulling along the slope.

Chapter markers

Checkpoints

Checkpoint 1: Predict the outcome

Not started

A block rests on a ramp and does not move. You slowly raise the ramp angle while the surfaces stay the same. What happens to the friction force needed to hold the block still?

Checkpoint 2: Order the sequence

Not started

Put these events in the order they happen as the ramp is raised from flat until the block slides.

  1. The block begins to slide down the ramp.
  2. Friction reaches its limit for these surfaces.
  3. The along-slope pull grows and friction grows to match it.
  4. The ramp is flat and no friction is needed.

Checkpoint 3: Find the slipping angle

Not started

The coefficient of friction between the block and the ramp is 0.50. Use the slider to estimate the angle at which the block starts to slide.

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