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What is Force?

What is Force?. What is Force?. What is force? A push or pull on an object that changes the motion of the object. Force is measured in Newtons SI unit symbol is N 1 N = the gravity on Earth of 100g of mass

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What is Force?

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  1. What is Force?

  2. What is Force? • What is force? • A push or pull on an object that changes the motion of the object. • Force is measured in Newtons • SI unit symbol is N • 1 N = the gravity on Earth of 100g of mass • There has to be something receiving the force as well as something applying the force.

  3. What is Force? • You can not always see the force being exerted • Gravity • Static electricity • Others

  4. Net Force • The combination of all the forces acting on an object • Example 4 N Net Force = 8N 4 N

  5. Net Force • The combination of all the forces acting on an object • Example 1 N 4 N Net Force = 3N

  6. Balanced Forces • The combination of all forces acting on an object. • Example 4 N 4 N 4 N Net Force = 0 N 4 N 4 N 4 N 4 N 4 N

  7. Balanced Forces • The combination of all forces acting on an object. • Example 8 N 4 N 10 N Net Force = 0 N 5 N 5 N 4 N 10 N 8 N

  8. Unbalanced Forces • The combination of all forces acting on an object are not equal. • Example 4 N 4 N 4 N Net Force = 1 N 4 N 5 N 4 N 4 N 4 N

  9. Unbalanced Forces • The combination of all forces acting on an object are not equal. • Example 6 N 8 N 10 N Net Force = 4 N 5 N 5 N 4 N 10 N 6 N

  10. Unbalanced Forces • The combination of all forces acting on an object are not equal. • Example 6 N 8 N 10 N 5 N 1 N 4 N 10 N 6 N

  11. Unbalanced Forces • Unbalanced forces can cause a change in motion

  12. What is Friction? • Friction is the force that opposes motion • Friction occurs when two objects slide over each other • The amount of friction depends on several factors • The roughness of the surfaces • The force pushing the surfaces together

  13. What is Friction? • The amount of friction depends on several factors • The roughness of the surfaces • The force pushing the surfaces together • Includes the downward force and the horizontal force • .

  14. Types of Friction • There are two types of friction • Kinetic • Kinetic friction is the force that tries to slow a moving object down • Static • Static friction is the force that tries to prevent an object at rest, from moving

  15. Overcoming the affects of Friction • There are other types of friction • Sliding • Sliding friction happens when two objects slide over each other • Example • Pushing a crate across the floor

  16. Overcoming the affects of Friction • Rolling • Rolling friction happens when an object slides on rollers or wheels • Example • Skates, • a wagon, • markers under a book

  17. Overcoming the affects of Friction • Fluid friction • Fluid friction happens when an object slides over a surface that has a layer of fluid on it • Example • Water on the floor • Oil in an engine .

  18. Gravity

  19. Isaac Newton • 1665 under an apple tree

  20. Gravity • Isaac Newton • Two questions? • Why do things fall to the Earth? • Why do the planets stay in motion?

  21. Gravity • Gravity • The force of attraction between two bodies • All matter has mass, therefore all matter has gravity

  22. Gravity • The Law of Universal Gravitation • Gravitational force increases as mass increases • Gravitational force decreases as distance increases

  23. Gravity • Gravity and Motion • Galileo dropped two cannon balls from the tower at Pisa. • Each cannon ball had a different mass • They both hit the ground at the same time • Gravity accelerates all objects at the same rate • 9.8 m/s/s (4.9m/s first second and 9.8 every second after) • .

  24. V = 0m/s 4.9m V = 9.8m/s 14.7m V = 19.6m/s 24.5m V = 29.4m/s

  25. Gravity • Gravity accelerates all objects at the same rate • 9.8 m/s/s (4.9m/s first second and 9.8 every second after) • Air Resistance • Similar to friction in that it opposes the motion of a falling object in air

  26. Gravity • Terminal Velocity • When the force of air resistance is equal to the force of gravity and a falling object no longer accelerates

  27. Gravity • Terminal Velocity..When the force of air resistance is equal to the force of gravity and a falling object no longer accelerates • Free fall • Only the force of gravity is pulling on an object

  28. Gravity • Free fall . • Only the force of gravity is pulling on an object • Orbits... • A combination of forward motion and the downward pull of gravity • Projectile Motion • The curved path that an object takes when thrown or launched

  29. Projectile Motion • The curved path that an object takes when thrown or launched

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