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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


  • 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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