Force, Friction, Gravity, &            Elastic Forces
Forces 1 What is force? What is an example of force?
Forces 2 Force is simply defined as a push or a  pull. Force is described by it’s magnitude  (strength) and by the direc...
Forces 3 The combination of all forces acting on  an object is referred to as the net force. ALWAYS SHOW THE DIRECTION O...
Forces 4 When two forces are acting in the same  direction, they produce a larger net  force. (add, both #s are positive)...
Friction 1   Friction is a force that two surfaces exert    on each other when they rub against    each other.   If ther...
Friction 2   Strength of friction depends on two    things:        Types of surfaces involved       How hard the surfac...
Friction 3 Static Friction is the friction that acts on  an object that is not in motion.  Examples? Sliding Friction is...
Friction 4 Rolling Friction is the friction acting  when an object is rolling. Rolling friction  is less than sliding fri...
Gravity 1 What is gravity? Gravity is a force that pulls objects  toward each other. Gravity acts everywhere in the uni...
Gravity 2 The force of gravity increases between  objects with greater mass and  decreases with greater distance. Make s...
Gravity 3   Gravity and Weight- remember:    Weight is a reflection of the gravitational pull     on an object.    Form...
Gravity 4 Gravity and motion! What goes up, must  come down. Free Fall is when the force of only  gravity is causing an ...
Gravity 5   Air Resistance is an upward force that    acts on objects as they fall through the    air.    The larger the...
Gravity 6   Projectile Motion is the motion an    object experiences when it’s been    thrown.    Objects thrown horizon...
Elastic Forces 1   Something is considered to be elastic if    it returns to it’s original shape after it’s    squeezed o...
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Force,gravity,elastic

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Force,gravity,elastic

  1. 1. Force, Friction, Gravity, & Elastic Forces
  2. 2. Forces 1 What is force? What is an example of force?
  3. 3. Forces 2 Force is simply defined as a push or a pull. Force is described by it’s magnitude (strength) and by the direction in which it acts. The SI unit of measure for the magnitude of a force is Newton (N)
  4. 4. Forces 3 The combination of all forces acting on an object is referred to as the net force. ALWAYS SHOW THE DIRECTION OF ALL FORCES!!!!!!
  5. 5. Forces 4 When two forces are acting in the same direction, they produce a larger net force. (add, both #s are positive) When two forces are acting in opposite directions, they produce a net force in the direction of the larger force. Equal opposite forces cancel out and produce no net force. (no movement)
  6. 6. Friction 1 Friction is a force that two surfaces exert on each other when they rub against each other. If there weren’t friction (like in space) objects would just keep moving until they ran into something.
  7. 7. Friction 2 Strength of friction depends on two things: Types of surfaces involved How hard the surfaces push together
  8. 8. Friction 3 Static Friction is the friction that acts on an object that is not in motion. Examples? Sliding Friction is friction that acts when two solid surfaces slide over each other. Examples?
  9. 9. Friction 4 Rolling Friction is the friction acting when an object is rolling. Rolling friction is less than sliding friction. Examples? Fluid Friction is the friction that occurs when a solid object moves through a fluid and is less than sliding friction. Examples?
  10. 10. Gravity 1 What is gravity? Gravity is a force that pulls objects toward each other. Gravity acts everywhere in the universe- not just Earth!
  11. 11. Gravity 2 The force of gravity increases between objects with greater mass and decreases with greater distance. Make sense? Examples?
  12. 12. Gravity 3 Gravity and Weight- remember: Weight is a reflection of the gravitational pull on an object. Formula for calculating weight is… Weight = Mass x Acceleration from Gravity
  13. 13. Gravity 4 Gravity and motion! What goes up, must come down. Free Fall is when the force of only gravity is causing an object to accelerate in a downward direction. These objects will accelerate at 9.8m/s2 (This means that the speed will increase by 9.8 m/s every second. WOW!)
  14. 14. Gravity 5 Air Resistance is an upward force that acts on objects as they fall through the air. The larger the surface area, the more air resistance, the slower the object falls. Example: Leaf vs. a ball
  15. 15. Gravity 6 Projectile Motion is the motion an object experiences when it’s been thrown. Objects thrown horizontally will land at the same time as an object dropped if released at the same time. (Gravity acts on both of them).
  16. 16. Elastic Forces 1 Something is considered to be elastic if it returns to it’s original shape after it’s squeezed or stretched. Compression is the elastic force that squeezes or pushes matter together. Tension is the elastic force that stretches or pulls matter apart.

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