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Warm Up

Tuesday, October 18 Learning Target(s): -I can describe inertia and relate it to an objects mass - I can draw and describe free body diagrams. Warm Up -Write the following questions in preparation for the NFL films video (leave yourself some room between each question)

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Warm Up

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  1. Tuesday, October 18Learning Target(s): -I can describe inertia and relate it to an objects mass - I can draw and describe free body diagrams Warm Up -Write the following questions in preparation for the NFL films video (leave yourself some room between each question) What is an unbalanced force? What do they cause? A players resistance to an unbalanced force is called what? What determines a players inertia? How is mass different from weight?

  2. Wednesday, October 19Learning Target(s): - I can draw and describe free body diagrams - I can describe the effect of net force on motion Warm Up • Draw a free body diagram for an puck that is gliding across the ice to the right • What resistant force does the ice help reduce?

  3. Friday, October 21Learning Target(s): - I can draw and describe free body diagrams - I can describe the effect of net force on motion Warm Up • A man punches a wall with a force of 50 Newton’s. Which statement is true? A.) The wall exerts a 20 N force back on his hand. B.) The wall exerts a 40 N force back on his hand. C) The wall exerts a 50 N force back on his hand. D) Walls are stationary objects, they cannot exert force.

  4. Types of Forces Weight - force of gravity (Fgrav) Normal force – surface pushing back (Fnorm) Friction - resistance force (Ffric) Applied force - force you exert (Fapp) Tension - applied through a rope or chain (Ften) Net force – total vector sum of all forces (Fnet) Balanced forces – equal and opposite Unbalanced forces – not equal and opposite

  5. Normal Force (FN) FN Examples: FN Wa l l REVIEW Defined as the force of a surface pushing back on an object. Always directed perpendicular to the surface. This is a contact force. No contact…no normal force. NOT always equal to weight. Table

  6. Types of friction Static friction is always greater than kinetic friction! • Static friction is the force an object must overcome to start moving. • Kinetic friction is the force an object must overcome to keep moving.

  7. Free body diagrams

  8. A Book is sitting on a table

  9. A ball is in free fall

  10. A man pushes a crate causing an acceleration to the right.

  11. A man pushes a crate and it does not move

  12. A puck is gliding across the ice to the right

  13. A man is pushing a box up a 100 ramp to the right

  14. A man is pushing a box hard enough to keep it still on a 300 ramp

  15. A box is sliding down a ramp that is 200

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