Physics Basics: Force, Friction, and Gravity

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Force Friction and Definition

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Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism.

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Force Friction and Equation

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The equation for frictional force is F_friction = μN, where μ is the coefficient of friction and N is the normal force.

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Force Gravity and Definition

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Gravity is a force by which a planet or other body draws objects toward its center. It is responsible for the weight of an object.

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Force Gravity and Equation

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The equation for gravitational force is F_gravity = mg, where m is mass and g is the acceleration due to gravity.

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Acceleration due to gravity on Earth

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The acceleration due to gravity on Earth is approximately 9.81 m/s².

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Coefficient of Friction and Definition

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The coefficient of friction is a dimensionless scalar value which represents the frictional force between two bodies in contact.

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SI units for Mass

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The SI unit for mass is the kilogram (kg).

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SI units for Force

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The SI unit for force is the newton (N).