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Journal CH 4-2

Journal CH 4-2. FORCE : Definition : Any push or pull on an object Examples : A person pushes you with force You hit a baseball. The baseball is hit with a force EFFORT FORCE: The push/pull that BEGINS something Example: Mike pushes you. Mike is the effort force

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Journal CH 4-2

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  1. Journal CH 4-2 FORCE: • Definition: Any push or pull on an object • Examples: • A person pushes you with force • You hit a baseball. The baseball is hit with a force • EFFORT FORCE: The push/pull that BEGINS something • Example: • Mike pushes you. Mike is the effort force • You hit a baseball. You are the effort force

  2. 2. RESISTANCE FORCE: A. Force that RESISTS the effort force • Points in OPPOSITE direction as the effort force • Example1: Mike pushes a light person. • Effort Force = Mike pushing • Resistance Force = Person pushing back Resistance Force: You Effort Force: Mike

  3. Example 2:Mike pushes a more massive person. • Effort Force = Mike pushing • Resistance Force = You pushing back Resistance Force: (200 lb person) Resistance Force: (100 lb person) Effort Force: Mike Bigger masses equal more atoms to move so more resistance to overcome

  4. Gravity: • Definition: The force pushing/pulling down on an object due to a planets mass • Cause of Gravity: • Gravity is caused by the mass of the planet • Larger masses have larger forces of gravity • Smaller masses have smaller forces of gravity • Direction of Gravity: Gravity ALWAYS pushes/pulls down toward the center of the planet Weight Weight Gravity Gravity Earth Earth Earth Moon

  5. 3. Normal Force: • Definition: The force pushing opposite gravity due to the ground, table top, etc. • 2 rules: • The normal force must be a solid • The normal force always the force pushing down Weight Weight More mass = more gravity force FNormal FNormal More weight = more normal force

  6. Air molecules Ffriction 4. FORCE OF FRICTION (Resistance Force) • Definition: Moving objects hit molecules. These molecules slow it down & heat is created FEngine = Effort Force Ground molecules • Air Friction: • Air molecules hit the car. • This slows the car down (you feel wind) • Force goes opposite the effort force

  7. Air molecules Ffriction • FORCE OF FRICTION FEngine = Effort Force Ground molecules • C. Ground Friction: • The object (in this case the wheels) come into contact with the ground • This creates pressure between the two points slowing the object down

  8. FGravity FGravity 1 1lb • SHAPE VS. FALLING SPEED: • More aerodynamic shapes fall faster because they have less friction 1 lb FFriction FFriction • Gravity is the SAME because • Mass of Earth is the same • Force of friction is different because of the aerodynamic shape • So…the flat shape falls slower

  9. Fgravity = stays the same Because the mass of the planet is the same Ffriction = increases 1st: because he flails his arms out 2nd: because he uses a parachute Friction slows him down

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