22_net_force

# 22_net_force - Lesson 22 Net Force The net force is the...

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Lesson 22: Net Force The net force is the vector sum of all the forces acting on an object. If the forces are parallel we can just add them together as positive and negative forces. If the forces are at an angle we have to add them as components of vectors. Example 1 : A car is stuck in a snow drift. Niels and Katrien attach two ropes to the vehicle and try to pull it out by pulling in the same direction. Niels pulls with a force of 75N while Katrien pulls with a force of 68N. There is a force due to friction of 40N acting on the car. Sketch a free body diagram of the situation and determine the net force acting on the car. Sketch a top-down diagram, remembering to show the friction acting against the two people pulling. Notice how Niels and Katrien and both pulling in the same direction, parallel to each other. Since we've shown it to the right, we will call these two forces positive. Friction is acting against them, in exactly the opposite direction. We will call this force negative. To determine the net force, we will need to write out a formula. We won't find this on the data sheet, since every net force question can be based on different forces. Net force will be equal to all the forces from the free body diagram added together. F NET = F an + F ak + F f = 75 + 68 + -40 Fnet = 103 N The net force is 103 N acting to the right. Example 2 : As Niels and Katrien pull the car, they notice a patch of ice on the road directly in front of them. To keep on pulling without slipping on the ice, they must begin to pull at an angle as they walk around the ice. Niels still pulls with a 75N at [E15 O N] and Katrien pulls with 68N at [E20

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22_net_force - Lesson 22 Net Force The net force is the...

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