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Newton's laws
Review Newton's three laws and weight as an application of the second law.
Key formulas
- Newton's first law
a body remains at rest or with constant velocity in an inertial frame if the net force is zero.
- Newton's second law
The acceleration of a body is proportional to the net force and inversely proportional to its mass.
- Newton's third law
action and reaction forces act on different bodies.
- Weight
Weight is the product of mass and gravitational acceleration.