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Forces

Forces. What is a Force?. Force: A push or a pull. Gives an object energy causing it to start moving, stop moving & change directions. How are F orces described?. A force is described by its strength and by the direction in which it acts.

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Forces

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  1. Forces

  2. What is a Force? Force: • A push or a pull. • Gives an object energy causing it to start moving, stop moving & change directions.

  3. How are Forces described? • A force is described by its strength and by the direction in which it acts. • The direction and strength of a force can be represented by an arrow. A force acting to the left A stronger force acting to the right • The arrow points to the direction of the force • The length of the arrow tells you the strength of the force. • The longer the arrow, the greater the force. • The strength of a force is measured in the SI unit called a Newton (N).

  4. How do Forces affect Motion? • Often more than one force acts on an object at the same time. • The combination of all the forces on an object is called the net-force.

  5. Balanced Forces • Forces that are in opposite directions and equal in size. The box would not move because there is a zero net force. • The forces cancel each other out and there is NO MOTION.

  6. Unbalanced Forces • When the total force (net force) on an object is in one direction. The box would move LEFT with a Net force of 5N • Two forces, one larger than the other therefore the motion will be in the direction of the larger force. Unbalanced Forces have MOTION!

  7. Recognizing Balanced and Unbalanced Forces What is the net force on the car? Net Force = Is the force balanced or unbalanced?

  8. Recognizing Balanced and Unbalanced Forces What is the net force on the car? Net Force = 3N Is there motion? Yes! 3N Is the force balanced or unbalanced?

  9. Recognizing Balanced and Unbalanced Forces Both men are pushing on the refrigerator with a force of 100N. What is the net force on the refrigerator? Net Force = Is the force balanced or unbalanced?

  10. Recognizing Balanced and Unbalanced Forces Both men are pushing on the refrigerator with a force of 100N. What is the net force on the refrigerator? Net Force = 0N Is there motion? NO! Is the force balanced or unbalanced?

  11. Recognizing Balanced and Unbalanced Forces Both of the people on the left are pulling with a force of 30N to the left. On the right side of the rope, one person is pulling with 35 N to the right, and the other person is pulling with 20N to the right. What is the net force on the rope? Net Force = Is the force balanced or unbalanced?

  12. Recognizing Balanced and Unbalanced Forces Both of the people on the left are pulling with a force of 30N to the left. On the right side of the rope, one person is pulling with 35 N to the right, and the other person is pulling with 20N to the right. 30N  55N  What is the net force on the rope? Net Force = 25N  Is the force balanced or unbalanced?

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