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The Net Force

The Net Force. not the “dark side” of the force. The Net Force. In the expression F = ma , the a can be interpreted as the total resultant acceleration which a body receives when acted upon by some total force whose magnitude and direction are given by F.

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The Net Force

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  1. The Net Force not the “dark side” of the force

  2. The Net Force • In the expression F = ma, the a can be interpreted as the total resultant acceleration which a body receives when acted upon by some total force whose magnitude and direction are given by F.

  3. Since force is a vector quantity, the total force acting upon an object is the vector sum of the separate forces that are acting. It is usually called the net force. Where Fnet = F1 = F2 + F3 …..

  4. Ex.1 Johnny and Billy are playing tug – o – war. Each is pulling with 75 N. Fnet = F1 + F2 Fnet = 75 + (-75) Fnet = 0

  5. Ex.2: This time Johnny and Billy are pulling on a sled. Each is pulling with 75 N • Fnet = F1 + F2 • Fnet =75 + 75 • Fnet = 150 N

  6. In real situations, friction is often a force that reduces the applied force (Fa) • This results in the formula Fnet = Fa +Ff • (recall that Ff like all force is a vector, so it being in the opposite direction will have a – sign associated with it.)

  7. eg. Suppose a 10 kg object is being accelerated by a 10 N force. The force of friction is 6 N. What is its resultant acceleration?

  8. e.g.2 A 3 kg object is going 5 m/s at t= 0 seconds. 4 seconds later it is traveling at 2 m/s. What force of friction is acting?

  9. e.g. 3 A force of 50 N is applied to a snow sled at 30º above the horizontal. The force of friction present is 18 N. Find: Fh, Fnet, a

  10. If it started from rest, find its displacement after 4 seconds.

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