Lesson: Normal Reaction Force on a Sloping Surface Physics • 9th Grade

In this lesson, we will learn how to analyze weight, friction, and normal reaction forces contributing to the motion of objects on sloped surfaces.

Lesson Video

Video Thumbnail
15:43

Lesson Playlist

  • Calculating the Acceleration of an Object on a Smooth Slope
    02:41
  • Figuring Out the Weight and Normal Reaction of a Point Mass on a Slope
    03:05

Lesson Worksheet

Q1:

An object has a mass 𝑚=1.5kg. The object is initially moving at a speed 𝑢=1.2/ms parallel to a slope with an angle 𝜃=29∘, as shown in the diagram. The surface of the slope produces friction with the base of the object. The object’s upward displacement 𝑠=11cm along the slope before it is instantaneously at rest on the slope. Find the magnitude of the friction force.

Q2:

An object is initially moving at a speed 𝑢 parallel to a smooth slope with an angle 𝜃=36∘, as shown in the diagram. The object’s upward displacement 𝑠=7.2cm along the slope before it is instantaneously at rest on the slope. Find 𝑢.

Q3:

An object has a mass 𝑚=1.4kg. The object is initially at rest at the top of a slope with an angle 𝜃=50∘, as shown in the diagram. The surface of the slope produces friction with the base of the object. The object’s downward displacement 𝑠=5.5cm along the slope, where it has an instantaneous speed 𝑣=0.85/ms. Find the friction force acting on the object.

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