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Forces

Forces. Force - push or pull represented by F (always capital) measured in Newtons (N) in metric system Vector quantities Amount (number value with units) Direction (N, S, W, E, up, down, etc.) Represented by arrows – the larger the force the longer the arrow. F ground. F friction.

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Forces

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  1. Forces

  2. Force - push or pull • represented by F (always capital) • measured in Newtons (N)in metric system • Vector quantities • Amount (number value with units) • Direction (N, S, W, E, up, down, etc.) • Represented by arrows – the larger the force the longer the arrow

  3. Fground Ffriction Fapplied Fgravity (weight) Free Body Diagrams • Show all forces acting on an object • Represent the object as a dot • All forces start at the dot Example: A 400 N wheelbarrow is being pushed at an angle of 30˚ above the horizontal with 30 N of force. Fapplied Fground Ffriction Fgravity (weight)

  4. Net Force • All of the forces acting on an object can be combined into one force – the net force. • The net force is a single force that has the same effect that the individual forces had when acting together • Fnet = net force

  5. 15 N 25 N Forces in the same direction add Example: **When forces are in the same direction the net force is maximum When forces are applied with each other (in the same direction) the overall effect is a larger push 40 N net Force

  6. Forces in opposite directions subtract Example: **When forces are in opposite directions the net force is minimum When forces are applied against each other (opposite directions), the overall effect is a smaller push 15 N 25 N 10 N net Force

  7. 25 N 15 N When forces are at right angles to each other, the net force (Fnet) can be determined using Pythagorean Theorem (a2+b2=c2) example: a2+b2=c2 (15N)2+(25N)2= c2 225 +625 = c2 √ c2 = √ 850 c = 26.93 N = Fnet • Fnet • Make sure the individual forces are connected in one continuous path!! • Forces are vectors…Don’t forget the direction (arrowhead)!!

  8. In order to draw the net force: • Move the individual forces around until they are connected in one continuous path • ** Make sure to keep the size and direction of each force the same • The net force connects the open tail to the open tip Using a diagram, the direction of the net force (Fnet) can be determined no matter which way the individual forces are pointing Fnet F3 F1 F2 F2 F3 F1

  9. Example

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