Important Forces: Normal Force
About the Lecture
The lecture Important Forces: Normal Force by Jared Rovny, PhD is from the course Force.
Included Quiz Questions
Why is the Normal Force called “normal”?
- It is perpendicular to the surface exerting it.
- It is the most typical of the forces.
- It is the average of forces between any two surfaces.
- It is in contrast to the “abnormal” friction force.
- It is a reference to the name of its discoverer.
If an object is at rest on a surface, what must be TRUE about it?
- Its acceleration must be zero.
- Its acceleration must be positive to stay above the surface.
- It cannot have any downwards forces acting on it.
- Gravity is not acting on it because it cannot move into the surface.
- The Normal force will pull it to the surface.
An object is sliding down a slope that makes an angle θ with the ground, and a force of gravity F₉ is acting on it. What is the magnitude and direction of the net force acting on the object?
- F₉sinθ with a direction parallel to and down the slope
- F₉ with a direction parallel to and down the slope
- F₉cosθ with a direction parallel to and down the slope
- F₉cosθ with a direction perpendicular to the slope
- F₉ with a downward direction falling to the ground
A slope makes an angle θ with the ground with an object resting on it. A gravitational force F₉ acts on the object. What are the parallel and perpendicular components of F₉ to the slope?
- Parallel component of F₉ = F₉sinθ, Perpendicular component of F₉ = F₉cosθ
- Parallel component of F₉ = F₉cosθ, Perpendicular component of F₉ = F₉sinθ
- Parallel component of F₉ = F₉, Perpendicular component of F₉ = F₉cosθ
- Parallel component of F₉ = F₉sin²θ, Perpendicular component of F₉ = F₉cos²θ
- Parallel component of F₉ = F₉sinθ, Perpendicular component of F₉ = F₉
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Author of lecture Important Forces: Normal Force
Jared Rovny, PhD
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