Chapter 12: Forces and Motion

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Presentation transcript:

Chapter 12: Forces and Motion Section 12.4 Universal Forces

Electromagnetic Forces Associated with charged particles Electric forces Occur between charged objects like protons and electrons Magnetic forces Act on certain metals, poles of magnets, etc. Only types of forces that can both attract and repel Opposites attract Like repels like

Nuclear Forces Strong and weak nuclear forces hold the nucleus of an atom together. Strong nuclear force (remember this?) Holds neutrons and protons together Only acts over short distances Weak nuclear force Attractive force that acts only over short distances Weaker than the strong nuclear force

Gravitational Force An attractive force that acts between any two masses Weakest universal force Most effective over large distances Newton’s law of universal gravitation Says that every object in the universe attracts every other object The greater the mass of an object, the greater the gravitational force. The more distance between two objects, the less the gravitational force.

Centripetal Force A force that constantly changes the direction of an object and causes it to move in a circle Examples affected by centripetal force: Moon Satellites Examples (there are too many to list) of satellite uses include: communication tracking Earth’s weather and climate