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  2. Normal force - Wikipedia

    en.wikipedia.org/wiki/Normal_force

    Figure 2: Weight (W), the frictional force (F r), and the normal force (F n) acting on a block.Weight is the product of mass (m) and the acceleration of gravity (g).In the case of an object resting upon a flat table (unlike on an incline as in Figures 1 and 2), the normal force on the object is equal but in opposite direction to the gravitational force applied on the object (or the weight of ...

  3. Newton's laws of motion - Wikipedia

    en.wikipedia.org/wiki/Newton's_laws_of_motion

    For example, a free body diagram of a block sitting upon an inclined plane can illustrate the combination of gravitational force, "normal" force, friction, and string tension. [note 4] Newton's second law is sometimes presented as a definition of force, i.e., a force is that which exists when an inertial observer sees a body accelerating.

  4. Circular motion - Wikipedia

    en.wikipedia.org/wiki/Circular_motion

    The normal force can point downwards. The normal force can point downwards. Considering that the object is a person sitting inside a plane moving in a circle, the two forces (weight and normal force) will point down only when the plane reaches the top of the circle. The reason for this is that the normal force is the sum of the tangential force ...

  5. Force - Wikipedia

    en.wikipedia.org/wiki/Force

    The normal force, for example, is responsible for the structural integrity of tables and floors as well as being the force that responds whenever an external force pushes on a solid object. An example of the normal force in action is the impact force on an object crashing into an immobile surface. [4]: ch.12 [5]

  6. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    The normal force is defined as the net force compressing two parallel surfaces together, and its direction is perpendicular to the surfaces. ... This formula can also ...

  7. Free body diagram - Wikipedia

    en.wikipedia.org/wiki/Free_body_diagram

    In that case the friction force only has an x component, and the normal force only has a y component. The force of gravity would then have components in both the x and y directions: mgsin(θ) in the x and mgcos(θ) in the y, where θ is the angle between the ramp and the horizontal.

  8. Centrifugal force - Wikipedia

    en.wikipedia.org/wiki/Centrifugal_force

    Centrifugal force is a fictitious force in ... to be used in their normal form in such ... its mass. When these forces are added, the equation of motion has ...

  9. Reaction (physics) - Wikipedia

    en.wikipedia.org/wiki/Reaction_(physics)

    Simultaneously, the ground exerts upward force on the person ('reaction'). If this upward force is greater than the person's weight, this will result in upward acceleration. When these forces are perpendicular to the ground, they are also called a normal force. Likewise, the spinning wheels of a vehicle attempt to slide backward across the ground.