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Forces in 1D

Forces in 1D. What is a FORCE ?. A push or pull Interaction between two objects Can cause a change in motion of the object Vector. Objects actually touch. Objects do not have to touch “Force field”. Gravity. Contact vs. Field Forces. Types of Forces. Free Body Diagrams.

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Forces in 1D

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  1. Forces in 1D

  2. What is a FORCE? • A push or pull • Interaction between two objects • Can cause a change in motion of the object • Vector

  3. Objects actually touch • Objects do not have to • touch • “Force field” • Gravity Contact vs. Field Forces

  4. Types of Forces

  5. Free Body Diagrams • Picture that diagrams ALL forces present • Direction AND magnitude are considered Fn Ff Fapp Fg

  6. Balanced vs. Unbalanced Forces • Forces cancel out • Equal and opposite • Fnet = 0 • Constant speed = 0 acceleration • Forces do NOT cancel • Forces are not equal • Have a Fnet • Do have acceleration

  7. 490 N Fn Ff Fapp -300 N 300 N Fg -490 N

  8. Newton’s Laws • 1st law • Inertia • An object in motion will stay in motion/an object at rest will stay at rest UNLESS acted upon by an outside force • 2nd law • Fnet = ma • The net force on an object is proportional to its mass and acceleration • Fnet = 0 • 0 acceleration • balanced forces • Fnet > 0 • has acceleration • unbalanced forces

  9. Force due to Friction Static vs. Kinetic Objects in motion • Keeps an object from moving • Fapplied = Fstatic to start movement • The amount of friction depends on the SURFACES that • are in contact Ff = Fn • - coefficient of friction

  10. Example The combined mass of a sled and its rider is 46.4 kg. The sled is pulled across a frozen lake so that the force of friction between the sled and the ice is very small. • A force of 150.0 N is applied to the sled and produces an acceleration of 3.00 m/s2. What is the magnitude of friction that resists the acceleration? • What is the coefficient of friction between the sled and ice?

  11. Newton’s Laws • 3rd Law • For every action, there is an EQUAL and OPPOSITE reaction

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