Lesson 3.docx - NATS 1530 Lesson 3 Gravity and Motion Force and Acceleration Force a push or pull exerted on an object either from contact or a force

Lesson 3.docx - NATS 1530 Lesson 3 Gravity and Motion Force...

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NATS 1530 Lesson 3 Gravity and Motion Force and Acceleration Force: a push or pull exerted on an object, either from contact or a force field Contact force: friction/tension Field force: gravity/magnetism/air resistance Forces can act across empty space, they don’t require direct contact Acceleration : an increase or decrease in an object’s speed (ex. motion and rest) Arises from an imbalance of forces Friction : force that arises when two surfaces rub against each other Increases with mass Depend on the type of surfaces being rubbed together Contact force Normal force : force that arises from the support ground provides Perpendicular to the supporting surface Contact force Air resistance : air molecules force Tension : force acting on the object that moves it horizontally Contact force Mass, Gravity and Weight Mass: number of atoms an object has Fixed quantity: Does not change when placed anywhere Gravity force : an attractive force (a pull) exerted by all objects w/ mass The greater the mass, the stronger its pull Can be mapped by a gravimeter A weak force: only can be felt if the object being pulled has a great mass. Field force Earth’s gravity is weakest at equator Speed and separation distance of the satellites yields the earth’s gravity field because as the satellites pass over different parts of the earth’s surface, minuet changes in the mass of each of the satellites will cause minuet changes in the earth’s gravity field.
NATS 1530 Lesson 3 Weight : the strength of gravity exerted by a planet (or moon, etc.) on an object in the planet’s gravity field. Mass on the earth is greater than moon’s= the weight of an object on earth will be lighter when placed on the moon.

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