# ch4 - Ch 4 Newton's 2nd Law force mass and acceleration...

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1 Ch. 4 - Newton’s 2nd Law force, mass, and acceleration, What causes acceleration? A “push” or “pull” applied to an object causes the object to move. The “push” or “pull” is a FORCE. The change in velocity (rest to moving) is an ACCELERATION. Force is proportional to Acceleration F ~ a Force and acceleration a ~ F 2a ~ 2F 3a ~ 3F What relates the two terms? MASS m

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2 Newton’s Second Law The acceleration of an object is directly proportional to the net force applied and inversely proportional to the mass. F = F net = ma a = F net /m Mass, m - kilograms (kg) Acceleration, a - m/s 2 Force, F - kg-m/s 2 1 kg-m/s 2 = 1 N (Newton) Forces in Nature Forces : cause a “push” or “pull” on an object. There are FOUR fundamental forces in nature: • Electromagnetic (force between charged particles) • nuclear strong (force between nuclear components) • nuclear weak (another force between nuclear components) • gravitational (very weak force between all matter) Most of the “forces” we encounter in our common experience are EITHER gravitational or electromagnetic in nature (e.g ., weight, friction, drag, traction, tension, etc.). “New” forces? • Modern physics theories suggest that when the universe was very young (<< 1 second), these four forces were combined into a single force. • One goal of physics research is to find a single theory that
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ch4 - Ch 4 Newton's 2nd Law force mass and acceleration...

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