Unit 4

centripetal force - occurs when the direction of the velocity changes towards the center of curvature

a_c = v²/r

as velocity goes up, F_c goes up and F_n goes down

to find the minimum speed needed to complete a loop, set F_n to 0

Types of Energy

• thermal energy

• kinetic energy - the energy of movement

  • K = (1/2)mv²

• potential energy - the possibility of energy from placement

  • gravitational energy

  • elastic energy

Work

• work - a scaler quantity that could be negative

• work = Force • displacement

• if 0^o < θ < 90^o - w>0

• if θ = 90^o - w=0

• if 90^o < θ < 180^o - w>0