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Forces and Motion

Forces and Motion. Balanced and Unbalanced Forces. Net Force= the overall force acting on an object when all of the individual forces are added together. Balanced Force= When all forces acting on an object added up equals zero.

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Forces and Motion

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  1. Forces and Motion

  2. Balanced and Unbalanced Forces • Net Force= the overall force acting on an object when all of the individual forces are added together.

  3. Balanced Force= When all forces acting on an object added up equals zero. • An object that is being acted upon by a balanced force is undergoing no change in motion. • Examples: 1) A ball sitting still on the floor. 2) A ball rolling in a straight line at a constant speed.

  4. Unbalanced force= when all the forces acting on an object are added up and the sum is something other than zero. • An object experiencing an unbalanced force will be changing motion, so it would either be changing speed, direction or both. • Example 1: An orange is sitting on a table. Balanced or Unbalanced?

  5. Example 2: A car has a net force that equals 0. Balanced or Unbalanced? • Example 3: A box has the following forces acting on it: 5 N to the right, 5 N to the left, 8 N straight down, and 8 N straight up. Balanced or Unbalanced? • A car is going around a curve at a constant 55 Km/h. Balanced or Unbalanced?

  6. Normal force= the force exerted by an object to balance an outside force acting on it. • Example: When you sit on a chair, the chair exerts a normal force on your body that is equal to the force of gravity pulling your mass toward the Earth.

  7. Contact and Noncontact Forces • Contact force= must touch an object to change its speed or direction. • Friction is an example of a contact force. • Noncontact forces= can act on objects from a distance. • Gravity and Magnetism are the two most common noncontact forces.

  8. Gravity= a force that pulls two objects with mass toward each other. • The size of the gravitational force depends on two factors: 1) the masses of the objects and 2) the distance between the objects. • Weight is the force that is applied to an object due to gravity.

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