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The Nature of Forces Chapter 11
Force A force is a push or pull A force gives energy to an object sometimes causing it to start moving, stop moving, or change directions. Force is measured in Newtons (N)
Combining Forces If forces go in the same direction - add together 10 N + 10 N = 20 N to the right If forces go in opposite directions - subtract 10 N 15 N = 5 N to the left
Friction Friction is a force that opposes motion Causes a moving object to slow down and eventually stop Lubricant - reduces friction Examples: oil, wax, water, wheels, axles
Newton’s 1st Law of Motion 1st Law states that objects in motion stay in motion and objects at rest will stay at rest Inertia - objects have a tendency to remain in motion or stay at rest
Newton’s 2nd Law of Motion The 2nd Law demonstrates how mass, force and acceleration are related Force = mass x acceleration
Newton’s 3rd Law of Motion The 3rd Law states that for every action there is an equal and opposite reaction All forces come in pairs
Newton’s Laws of Motion
Gravity Gravity is a force of attraction between two objects The larger objects “pulls” smaller object towards them All objects on Earth are pulled toward the core
Falling Objects All objects near the Earth’s surface fall at a rate of 9.8 m/sec/sec Air resistance - opposes downward motion of objects Objects with greater surface area have greater resistance
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Monday October 14, 2013 Agenda: I can identify key terms about forces and motion. Daily Science: What is the basic SI unit for length? Learning target.
I. Motion – an objects change in position over time when compared to a reference point. A. Reference point- an object that appears to stay in place; building,
Motion - a change in position of an object, caused by an object Force – a push or a pull, caused by another object Force Can – Start Motion Stop Motion.
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STUDY GUIDE ANSWERS Popham 6 Science Ms. Browne. 1. WHAT IS A FORCE? A force is a push or pull There are two main types of forces balanced and unbalanced.
A Force is a push or a pull
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FORCE Chapter 10 Text. Force A push or a pull in a certain direction SI Unit = Newton (N)
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