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## Forces

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**Forces**How Do Forces Affect motion?**Force**• A push or a pull • Force can cause an object to change speed or direction • A Force is measured in Newtons • 1 N =1 kg x 1 m/s2 • Force = Mass x acceleration • Newton’s 2nd law**Net Force**• Combination of all forces acting on the object • Forces acting in the same direction: add together**Unbalanced Force**• Unbalanced force causes a change in the objects motion. Net force is NOT 0 Newtons**Balanced Force**• Net force is 0 Newtons**Newton’s Second law**• The acceleration of an object depends on the mass of an object and the amount of force applied. • F=ma • F= force; m= mass (kg); a= acceleration (km/s2) • What is the force? 24 kg x 40 m/s2 =N**Newton’s 1st law**• Law of inertia • An object at rest stays at rest, an object in motion stays in motion at the same speed unless, acted upon by an unbalanced force.**Newton’s third law**• Whenever an object exerts a force on a second object, the second object exerts an equal and opposite force on the first.**Newton’s 3rd law**• Forces in pairs have equal size but opposite directions