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Transcript
Newton's Second Law:
- F=ma
- Friction is caused by interaction of matter
- Force of friction=coefficient of friction*normal force
- Force causes pressure
- pressure= force/area
- Falling and air resistance:
- the longer you fall, the faster you go. Eventually, the air resistance will equal out with gravity and you will stop accelerating. This is called terminal velocity.
- Heavier objects are affected differently by air resistance. It takes more air molecules to slow down the heavier object which means it accelerates faster.
Chapter 6:
Action/Reaction:
- Whenever an object exerts a force on another. The second object exerts an equal and opposite force
- Horse and cart dilemma:
- horse pulls cart which means cart puts equal and opposite force on horse. It moves because of the force the horse applied to the ground and the force the cart applies to the ground
Chapter 7:
Momentume and Inertia:
- p=mv
- impulse=ft
- ft=change in mass*velocity
- Bouncing doubles the impact and change in momentum is doubled
- MOMENTUM IS ALWAYS CONSERVED
- Collisions
- m(1i)v(1i)+m(2i)v(2i)=m(1f)v(1f)+m(2f)v(2f)
- bounce off
- m(1)v(1i)+m(2)v(2i)=(m1+m2)v(f)
- stick together
- (m1+m2)vi=m(1)v(1f)+m(2)v(2f)
- explosion
Chapter 8:
Energy:
- w=fd
- power=work/time
- PE=mgh
- KE=(1/2)mv2
- Conservation of Energy- energy is never created or destroyed, it changes forms. Potential energy turns into kinetic energy and vice versus
- PE(1)+KE(1)=PE(2)+KE(2)
Chapter 5
Physics
Kylie Treacy
Force ramp problems:
1. Draw the weight straight down
2. Draw normal force perpendicular to ramp
3. Complete the last leg of inner triangle to be parallel to surface
Rope problems:
- remember to make two triangles
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