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Force and Net force

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Force We learned about the motion of objects. That there are three types of motion: speed, velocity, and acceleration. Also, how to calculate speed: Speed= d/t But, what causes an objects motion? Forces create or prevent motion.

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Force Force is a push or a pull Examples: gravity, friction, magnetic, electrical. Forces can be balanced or unbalanced. Balanced forces have no change in motion. Unbalanced forces create change in motion. Forces can be measured with a spring scale. Newton (N) is the unit of force.

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Force Spring scale (N):

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Examples of Balanced forces

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Unbalanced forces

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More Unbalanced forces

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Net Force

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The Net force is the sum (total) of all forces acting or applied to an object.

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Net Force

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Calculating Net Force When forces move in opposite directions you subtract to find the net force. Unbalanced forces creates motion/movement.

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Calculating Net Force When forces move in opposite directions you subtract to find the net force. Balanced forces have no motion.

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Calculating Net Force When forces move in the same direction you add to find the net force. Unbalanced forces creates motion/movement.

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Force Arrows Forces can be shown with force arrows The size of and length of the arrow show its strength (magnitude). A longer arrow = A stronger arrow 30N 10N 100N

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Any Questions?

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Practice Problem Juan pushes a box with a force of 5N to the left. Brandon pushes the same box from the opposite side with a force of 3N to the right. What happens to the box? A. The box moves to the right with a force of 8N. B. The box does not move forces are balanced. C. The box moves to the left with a force of 2N. Answer: Forces are opposite and must be subtracted. 5N-3N = 2N towards the left (larger force)

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Speed Problem Forces that act on objects can affect their speed and direction. A car is traveling down the street in direction A. Which of the forces shown in the figure above would affect ONLY the speed of the car? A. 1 B. 2 C. 3 D. 4

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Speed Problem Forces that act on objects can affect their speed and direction. A car is traveling down the street in direction A. Which of the forces shown in the figure above would affect ONLY the speed of the car? A. 1 B. 2 C. 3 D. 4

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