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  • 1. T- 1-855-694-8886Email- info@iTutor.comBy iTutor.com
  • 2. The cause of forces A force is a push or pull, or any action that has theability to change motion. The key word here is action, force is an action. Here are some ways of describing forces: A push A pull A stretch A squeeze A catch A twist
  • 3. Forces can make things: Speed up Slow down Change direction Change shape
  • 4. Units of force The Newton (N) is a metricunit of force.• We use a Newton meter tomeasure forces.It is sometimes called a forcemeter. A force of 1 Newton is theexact amount of force neededto cause a mass of 1 kilogramto speed up by 1 m/s eachsecond.
  • 5. Example of Newton One newton (N) is the force it takes to change the speedof a 1 Kg mass by 1 m/s in 1 second. One pound of force equals 4.48 newtons.
  • 6. Gravity and weight The force of gravity on an object is called weight. Mass and weight are not the same thing. Mass is an intrinsic property of a body, as it remains the sameeverywhere in the universe. Weight is variable due to change in the magnitude of thegravitational force applied by the earth.
  • 7. The force vector A force vector has units ofnewtons, just like all forces, butalso includes enough informationto tell the direction of the force. Positive and negative numbersindicate opposite directions. It is sometimes helpful to show the strength and directionof a force vector as an arrow. when drawing a force vector, you must choose a scale.If 1 cm = 1 N, how many newtons of force does this line represent?
  • 8. Forces in springs and ropes Tension is a force that acts in a rope, string, or otherobject that is pulled. Tension always acts along the direction of the rope.
  • 9. Forces in springs and ropes When you apply a compression force to a spring, itcollapses to become shorter. The force created by stretching or compressing aspring always acts to return the spring to its naturallength.
  • 10. The EndCall us for moreinformation:1-855-694-8886www.iTutor.comVisit