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 Plan

Students will be able to

calculate the component of the reaction force on an object on a sloping surface that acts vertically,
calculate the component of the reaction force on an object on a smooth sloping surface that acts horizontally,
determine the resultant force on an object on a rough sloping surface acting parallel to the surface.

Lesson Video

Lesson Playlist

02:41
03:05

Lesson Worksheet

Q1:

An object has a mass . The object is initially moving at a speed parallel to a slope with an angle , as shown in the diagram. The surface of the slope produces friction with the base of the object. The object’s upward displacement 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 parallel to a smooth slope with an angle , as shown in the diagram. The object’s upward displacement along the slope before it is instantaneously at rest on the slope. Find .

Q3:

An object has a mass . The object is initially at rest at the top of a slope with an angle , as shown in the diagram. The surface of the slope produces friction with the base of the object. The object’s downward displacement along the slope, where it has an instantaneous speed . Find the friction force acting on the object.