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Lesson 1 - Now

1. Objects must be in contact with one another to exert a force. 2. Gravity is a force that depends on the masses of the two objects and the distance between them. Do you agree or disagree?. Lesson 1 - Now. Forces. How do different types of forces affect objects?

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Lesson 1 - Now

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  1. 1. Objects must be in contact with one another to exert a force. 2. Gravity is a force that depends on the masses of the two objects and the distance between them. Do you agree or disagree? Lesson 1 - Now

  2. Forces • How do different types of forces affect objects? • What factors affect the way gravity acts on objects? • How do balanced and unbalanced forces differ? Lesson 2 Reading Guide - KC

  3. Forces • gravity • balanced forces • unbalanced forces • force • contact force • noncontact force • friction Lesson 2 Reading Guide - Vocab

  4. What are forces? • A push or pull on an object is a force. • A force has both size and direction. • Arrows are used to show the size and direction of the force. • There are two ways a force can affect an object: • A force can change an object’s speed and • the direction in which the object is moving. Lesson 2-1

  5. Types of Forces • A contact forceis a push or a pull applied by one object to another object that is touching it. • Contact forces are also called mechanical forces. Steve Cole/Getty Images Lesson 2-2

  6. Types of Forces(cont.) • A force that pushes or pulls an object without touching it is a noncontact force. • Gravity is an example of a noncontact force. Lesson 2-2

  7. Types of Forces(cont.) What is the difference between the way contact and noncontact forces affect objects? Lesson 2-2

  8. Friction • Friction is a contact force that resists the sliding motion between two objects that are touching. • The force of friction acts in the opposite direction of the motion. • Rougher surfaces produce greater friction than smooth surfaces. Lesson 2-3

  9. Gravity • Gravityis a noncontact attractive force that exists between all objects that have mass. • Gravitational force depends on the mass of the objects and the distance between them. Lesson 2-4

  10. Gravity(cont.) • Weight is a measure of the force of gravity acting on an object. • As two objects get farther apart, the gravitational force between the objects decreases. Lesson 2-4

  11. As the mass of one or both objects increases, the gravitational force between them increases. • Doubling the mass of one of the objects doubles the force of attraction. Lesson 2-4

  12. Gravity(cont.) What factors affect the way gravity acts on objects? Lesson 2-4

  13. Combining Forces • When several forces act on an object, the forces combine to act as a single force. • The sum of the forces acting on an object is called the net force. Lesson 2-5

  14. Combining Forces(cont.) When different forces act on an object in the same direction, you can find the net force by adding the forces together. Lesson 2-5

  15. Combining Forces(cont.) When forces act in opposite directions, you must include the direction of the force when you add them. Lesson 2-5

  16. Combining Forces(cont.) When the net force on an object is 0 N, the forces acting on it are balanced forces. Lesson 2-5

  17. Combining Forces(cont.) If the forces acting on an object are balanced, the object’s motion does not change. Lesson 2-5

  18. When the net force acting on an object is not 0, the forces acting on the object are unbalanced forces. • Unbalanced forces cause objects to change their motion, or accelerate. Lesson 2-5

  19. Combining Forces(cont.) How do balances and unbalancedforces differ? Lesson 2-4

  20. Forces are pushes and pulls exerted by objects on each other. Contact forces occur when objects are touching. Noncontact forces act from a distance. Lesson 2 - VS

  21. Gravity is a force of attraction between two objects. The amount of gravitational force depends on the mass of the objects and the distance between them. Lesson 2 - VS

  22. Balanced forces do not affect motion. Unbalanced forces change motion. Lesson 2 - VS

  23. Which is a measure of the force of gravity acting on an object? A. friction B. mass C. unbalanced force D. weight Lesson 2 – LR1

  24. Which term refers to the sum of the forces acting on an object? A. friction B. net force C. balanced forces D. unbalanced forces Lesson 2 – LR2

  25. Which force pushes or pulls an object without touching it? A. balanced B. contact C. net D. noncontact Lesson 2 – LR3

  26. 1. Objects must be in contact with one another to exert a force. 2. Gravity is a force that depends on the masses of the two objects and the distance between them. Do you agree or disagree? Lesson 1 - Now

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