Friction on Inclined Plane – AP Physics 1 | ShowMeClass

⛰️

Friction on Inclined Plane

AP Physics 1 · Unit 2: Forces & Newton's Laws

Learning Objectives

Resolve gravity into parallel/perpendicular components

Apply static vs kinetic friction on inclines

Find the critical angle for impending motion

Determine acceleration of a block on a ramp

Key Equations

Critical Angle

Object slides when tan(θ) > μₛ. At the critical angle, tan(θ) = μₛ. Below this: static equilibrium. Above: kinetic friction applies.

Inclined PlaneFrictionAP Physics 1

Acceleration

0.00

m/s²

Velocity

0.00

m/s

F∥ (gravity along)

0.0

N

Friction Force

0.0

N

Status

STATIC

Angle θ (°) 30°

Mass m (kg) 5 kg

Static μₛ 0.50

Kinetic μₖ 0.35

Drag the angle slider past the critical angle to see the block start to slide!

📝 Quick Quiz▼

1. The normal force on a block on an incline of angle θ is:

mg mg sin θ mg cos θ mg tan θ

2. A block is on the verge of sliding when tan(θ) equals:

μₖ μₛ μₛ/μₖ 1/μₛ

3. A 10 kg block on a 30° frictionless incline has acceleration (g = 10 m/s²):

10 m/s² 8.66 m/s² 5 m/s² 2.5 m/s²