Physics Normal and Contact Forces
Gain a better understanding of Newton's first law of motion, gravity, normal force, and friction with this course.Publisher: Khan Academy
CertificationView course modules
Newton's first law states that an object at rest will stay at rest while an object in motion will stay in motion unless there is some unbalanced or net force. This course will first introduce you to a normal force which is the force when an object is resting on any surface that is perpendicular to the surface of the object. You will learn that if two surfaces are not in contact, they can't exert a normal force on each other.
Gravity decreases in strength the further you move away from the center of the earth. This course will discuss the force of gravity which is equal to mass times the gravitational field of the earth, about 9.8 meters per second. You will learn that a net force is mass times acceleration, and that to calculate the rate acceleration of an object, you divide the force of the direction it’s moving by the mass of the object. You will also study kinetic friction and static friction.
Kinetic friction is a force that acts between moving surfaces and static friction is a force that keeps an object at rest. By taking this course, you will learn how to calculate the static and kinetic friction on a stationary object to be moved along a surface. So, check out the course and start learning about the dynamics of moving objects on specific surfaces, today.
Understanding Normal and Contact Forces
Learning Outcomes - Physics Normal and Contact Forces
Normal Force and Contact Force
Normal Force in an Elevator
Inclined Plane Force Components
Ice Accelerating Down an Incline
Force of Friction Keeping the Block Stationary
Force of Friction Keeping Velocity Constant
Intuition on Static and Kinetic Friction Comparisons
Static and Kinetic Friction Example
Lesson Summary - Physics Normal and Contact Forces
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.
All Alison courses are free to enrol, study and complete. To successfully complete this Certificate course and become an Alison Graduate, you need to achieve 80% or higher in each course assessment. Once you have completed this Certificate course, you have the option to acquire an official Certificate, which is a great way to share your achievement with the world. Your Alison Certificate is:
Ideal for sharing with potential employers - include it in your CV, professional social media profiles and job applications
An indication of your commitment to continuously learn, upskill and achieve high results
An incentive for you to continue empowering yourself through lifelong learning
Alison offers 3 types of Certificates for completed Certificate courses:
Digital Certificate - a downloadable Certificate in PDF format, immediately available to you when you complete your purchase
Certificate - a physical version of your officially branded and security-marked Certificate, posted to you with FREE shipping
Framed Certificate - a physical version of your officially branded and security-marked Certificate in a stylish frame, posted to you with FREE shipping
All Certificates are available to purchase through the Alison Shop. For more information on purchasing Alison Certificates, please visit our FAQs. If you decide not to purchase your Alison Certificate, you can still demonstrate your achievement by sharing your Learner Record or Learner Achievement Verification, both of which are accessible from your Dashboard. For more details on our Certificate pricing, please visit our Pricing Page.