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Force. Definition: A push or a pull Force can cause motion SI unit -> Newton (N)= 1 kg x 1 m/s 2 Sometimes pound ( lb ) can be used as a unit for force 1 Newton=0.22481 pounds force. Combining Forces. Balanced Force Equal and opposite forces = ‘balanced’

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force
Force

Definition:

  • A push or a pull
  • Force can cause motion
  • SI unit -> Newton (N)= 1 kg x 1 m/s2
  • Sometimes pound (lb) can be used as a unit for force
  • 1 Newton=0.22481 pounds force
combining forces
Combining Forces
  • Balanced Force
    • Equal and opposite forces = ‘balanced’
    • Balanced forces give no motion

No motion of hands

combining forces1
Combining Forces
  • Unbalanced force – more force in one direction (net force)
net force
Net Force
  • Bigger force to the right
  • Smaller force to the left
  • Net force to the right
iii friction and gravity
III. Friction and Gravity
  • Friction – a force that opposes motion
    • Caused by the interaction between two touching surfaces rubbing against each other
    • Four Types
a static
a. Static
  • Friction that acts on something that is not moving
  • No heat or wear is generated
b sliding
b. Sliding
  • Force resulting when pushing or pulling an object over a surface.
c rolling
c. Rolling
  • Contact is reduced because of rollers or wheels or ball bearings.
d fluid friction
d. Fluid friction
  • Resistance from a “fluid”
  • Fluids are liquids and gases.
reducing friction
Reducing friction
  • A smooth surface does not demonstrate as much friction as a rough surface.
  • Waxing, oiling, etc. can be used to reduce friction.
coefficient of friction
Coefficient of Friction
  • µ= “coefficient of friction”  represents the roughness of the surfaces in contact.
  • In reality there two main subtypes:
  • µs- Static friction to get it moving
  • µk- Kinetic friction to keep it moving
  • µs> µk needed for movement to occur
slide12
Gravity

– force of attraction between two objects

---> pulling force

Factors Affecting Gravity

      • Mass – more mass, more gravity
      • Distance – closer, more gravity

http://www.exploratorium.edu/ronh/weight/

end check complete on separate sheet of paper
End Check- Complete on separate sheet of paper
  • 1. Describe three ways in which a car’s velocity will change
  • 2. Identify a one situation involving unbalanced force and one situation involving balanced force. Explain how it each affect the motion of an object.
  • 3. Arrange the following pairs of surfaces in order of most friction to least friction
    • A shoe sole and a waxed basketball court
    • A shoe sole and the frozen surface of a lake
    • A shoe sole and the sidewalk
end check complete on separate sheet of paper1
End Check- Complete on separate sheet of paper
  • 4. Explain why Venus, which is slightly less massive than Earth, experiences a stronger gravitational pull from the sun than Earth does.
  • 5. What is the average acceleration of a scooter that starts at rest and moves straight ahead at 12 m/s in 24 s.
  • 6. Which will be moving faster after 3.0 s, a cyclist maintaining a constant velocity of 15 m/s straight ahead or a race car accelerating forward from a stoplight at 4.0 m/s2?
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