Velocity - PowerPoint PPT Presentation

velocity n.
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  1. v Velocity Definition: the speed and direction of motion of an object. Measured in meters per second (m/s) Example: The car moved at a velocity of 20 m/s toward the east.

  2. a Acceleration Definition: the rate of change in velocity as a function of time. Measured in meters per second squared (m/s2) Example: The falling rock accelerated at a constant rate of 9.8m/s2.

  3. Velocity 1 s | 2 s | 3 s | 4 s | Acceleration

  4. m Mass Definition: how much the object will resist change to velocity. Measured in kilograms (kg) Example: The table was hard to move because it had a large mass.

  5. F Weight grav Definition: the force of gravity on an object. Example: Your weight is less on the Moon than on Earth.

  6. F Force Definition: a “pushing” or “pulling” on an object. Measured in Newtons (N) Example: I applied a force to move the chair.

  7. F norm F grav

  8. F Normal Force norm Definition: a forceperpendicular to the object’s contact surface. F F norm norm

  9. F norm F frict F grav

  10. F Friction frict Definition: the force that acts opposite to the motion of one object in contact with another object. Example: the force of friction opposed the motion of the sliding box, slowing it down.

  11. F norm F F app frict F grav

  12. ΣF F Net Force net Definition: the vector sum of forces. “Sigma F” Fnet = 15 N up

  13. Fnet = 0 Neitherdogwonthetug-of-warbecausetheybothpulledontheropewiththesame force.

  14. fs Static Friction Definition:friction that prevents the sliding motion between two objects. Measured in Newtons (N) Example: the static friction between the basketball player’s sneakers and the floor kept him from sliding.

  15. Fnorm fstatic Fgrav Finish Line

  16. fk Kinetic Friction Definition: friction that occurs between two objects when when one object slides against another Measured in Newtons (N) Example: the kinetic friction from rubbing my hands together warmed them on the cold winter’s night.

  17. Fnorm fkinetic Fgrav ouch! ouch! ouch!

  18. Newton’s first law of motion The Law of Inertia unless acted upon by an unbalanced force an object at rest stays at rest an object in motion stays in motion with the same velocity

  19. Newton’s second law of motion a The acceleration of an object produced by a net applied force Fnet is directly related to the magnitude of the force, and inversely related to the mass of the object = ___ m The net force equals mass times acceleration Fnet = ma

  20. F= ma F=ma

  21. Newton’sthirdlaw of motion Forces come in pairs! for every action (force) there is an equal and opposite reaction (force). Example: the angry bird exerts a force on the blocks and the blocks exert an equal and oppositeforce back.