1. BELLRINGER

2. Free Response Help
August 30- Day 1
1980 B1
1981 B1
1986 B1

3. Forces Newton’s 3 Laws Vector Addition
1) Law of Inertia: objects at rest will stay at rest and objects in motion will stay in motion unless acted on by an outside force
“inertia” is NOT a force but a RESULT of an object’s mass
If VELOCITY is constant, then there is NO NET force
2) The acceleration of an object is directly proportional to the NET force acting on it
∑F net = manet
3) For every action, there is an equal an opposite reaction
Vector Addition
The resultant is the sum of the x & y components
Can solve for using Pythagorean Theorum

4. Forces
Springs
When a spring is stretched or compressed from its unstressed length by a distance x , the law is
F = kΔx
Where k is the “spring constant”
This is unique to each spring

5. New Concepts & Equations
∑F = ma
f = µN
Work is the amount of force done over a distance
W = Fd
Work = (force )(distance)
Kinetic Energy is the energy of motion
Work also corresponds to the CHANGE in kinetic energy so…
ΔKE = (Fnet )( d )

6. Work Problems

7. Energy
Law of Conservation of Energy: in all cases, energy can not be created or destroyed--only transformed
This means our initial energy = final energy
The TOTAL energy of something looks at both kinetic and potential
KE = If it’s moving with a velocity =1/2mv2
PE= The position off the ground= mgh (where h is height)
KEi + PEi = KEf + PEf
1/2mvi2 + mghi = 1/2mvf2 + mghf

8. Centripetal Force