Physics Normal and Contact Forces - Revised

Free Course
The force of gravity affects us every day, it a constant in our lives and is key to the field of physics. Taking the time to study this course you will gain a grounded understanding of the normal and contact forces involved in gravity and objects moving along a surface or down a slope and how gravity plays it part.
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  • Duration

    1-2 Hours
  • Assessment

  • Certification

  • Responsive

  • Publisher

    Khan Academy




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The concept of force and the effects of different forces on objects is a key topic in the field of physics. For example, when you try to move a heavy object it takes more effort to get it moving than to keep it moving because of gravity and the different types of friction involved.

With this course Physics – Normal and Contact Forces, you will be taught about gravity and the normal force, along with why objects on slope do move despite the slope of the surface their resting on. The course will then introduce friction and its two type of static and kinetic, while also discussing how friction is dependent on the type of materials involved, at which point you will be taught about the coefficient of static friction relative to kinetic friction. Examples of each type of force are worked through giving the learner a clear insight into how forces work together and how to calculate their respective values

This physics course will be of great interest to students who are studying physics, chemistry. engineering and mathematics, to students who wish to pursue a career in any of the sciences or engineering fields, and to anybody wanting to understand the dynamics of moving objects on specific surfaces.

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Learning Outcomes

Upon the completion of this course you will be able to:

  • Explain what the what normal and contact force are.
  • Calculate normal force.
  • Explain the components of the force of gravity.
  • Describe static and kinetic friction and their differences.
  • Calculate the static and kinetic friction on a stationary object to be moved along a surface.


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