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Understanding Forces: Newton's Laws & Gravity

Explore Newton's Second Law of Motion, Gravity, Resistance, and Circular Motion. Learn how acceleration, force, mass, and velocity are interrelated. Discover the effects of gravity, air resistance, and centripetal force in different scenarios.

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Understanding Forces: Newton's Laws & Gravity

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  1. Newton’s Second Law of Motion

  2. Newton’s Second Law • Newton’s Second Law of Motion- Acceleration depends on the objects mass and the net force acting on the object. • Connects the net force on an object, its mass and its acceleration • Acceleration=net force/mass (not the same as motion, change in velocity)

  3. Gravity • Force exists between any two objects that have mass • Gravity always is attractive and pulls objects towards each other • Weight- Size of the gravitational force exerted on an object. • A free falling object towards Earth Accelerates 9.8m/s every second it falls. • Force of Gravity increases when mass increases and when objects get closer.

  4. Resistance • Air resistance is a form of friction that slows down any object moving in the air. • Falling objects with greater surface area experience more air resistance! • Terminal velocity- the greatest velocity an object reaches.

  5. Circular Motion • When object moves in a circle, it is constantly having change in velocity, so it has a constant Acceleration. • Centripetal Force- the force that causes the object to move in a circle. • Direction is toward the center of objects circular path • Ex: Satellites around Earth- moving so fast they never fall to Earth

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