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Section 2-1:

Exploring the concept of forces, their effects on objects, and the principles of balanced and unbalanced forces. Learn how to determine net force and its impact on motion.

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Section 2-1:

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  1. Section 2-1: What is a force?

  2. Forces acting on objects • Force is simply a push or pull on an object • It has both size (a number) and direction • Express force in a unit called a Newton (N)

  3. Acting on objects • All forces act on objects • Does not mean that motion will occur • Sources and receivers of forces • You cannot see all sources and receivers of forces: • For example: • Magnet’s force on a refrigerator • Air held near Earth by gravity

  4. Determining net force • Net force = the combination of all forces acting on an object • Usually there is more than one force acting on an object

  5. Forces in the same direction • When forces act in the same direction, you add the forces to determine net force Mrs. Bannon 20 Newtons Net force = Mr. Mager 30 Newtons 10 Newtons

  6. Forces in opposite directions • When forces act in opposite directions, you subtract the forces to find net force • Net force acts in the direction of the larger force 20 newtons east 10 newtons west Net force = 10 newtons east

  7. Balanced forces • When forces acting on an object produce a net force of o newtons • Will NOT cause a change in motion 10 newtons east 10 newtons west

  8. Unbalanced forces • When forces acting on an object produce a net force that is not 0 newtons 20 newtons east 10 newtons west What is the net force?

  9. Unbalanced forces continued • Will cause a change in motion • An object can continue to move, even after the unbalanced forces are removed from the object

  10. Forces practice- Push or a pull 5. 1. 2. 3. 4.

  11. Forces practice 1 • Look at the following picture. • Choose the best answer to complete each sentence and write the answer on your board (You do NOT have to write the entire sentence).

  12. Practice 1 • The forces shown are PUSHING/ PULLING • The forces shown are WORKING TOGETHER/ OPPOSITE FORCES • The forces are EQUAL/ NOT EQUAL • The forces DO/ DO NOT balance each other • The resultant force is 1000N TO THE RIGHT/ 1000 N TO THE LEFT/ ZERO • There IS/ IS NO motion.

  13. Forces practice 2 • Look at the following picture. • Choose the best answer to complete each sentence and write the answer on your board (You do NOT have to write the entire sentence).

  14. Practice 2 • The forces shown are PUSHING/ PULLING • The forces shown are WORKING TOGETHER/ OPPOSITE FORCES • The forces are EQUAL/ NOT EQUAL • The forces DO/ DO NOT balance each other • The stronger force is pulling to the RIGHT/ LEFT • The weaker force is pulling to the RIGHT/ LEFT • Motion is to the RIGHT / LEFT

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