Lesson: Normal Reaction Force on a Sloping Surface High School Physics

Physics

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

Worksheet: 9 Questions

Q1:

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.

Q2:

An object has a mass 𝑚=1.8kg. The object is on a slope with an angle 𝜃=42∘, as shown in the diagram. The surface of the slope produces friction with the base of the object. The acceleration 𝑎 of the object parallel to the surface of the slope is 5.4 m/s2. What is the magnitude of the friction force?

Q3:

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.
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