Forces affect motion
Properties and Principles of Force and Motion
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Forces are classified as either contact (pushes, pulls, friction, buoyancy) or non-contact forces (gravity, magnetism), that can be described in terms of direction and magnitude
Every object exerts a gravitational force on every other object
Magnetic forces are related to electrical forces as different aspects of a single electromagnetic force
Newton’s Laws of Motion explain the interaction of mass and forces, and are used to predict changes in motion
Perpendicular forces act independently of each other