Wednesday 18 Nov:

Take Equation Test

& Free Response Quiz:

Journal:

1. A firecracker explodes in midair.  Considering all the fragments upon explosion

a)       the total KE remains constant

b)       the total momentum decreases

c)       the total KE decreases

d)       the total momentum remains constant

e)       None of these

2. What happens to the momentum of a body of constant mass if while it’s traveling its kinetic energy is reduced to 1/2 of the original?

a)       It decreases by 1/2

b)       It remains the same

c)       It increases by a multiplicative 1.414

d)       It decreases by a multiplicative 1.414

e)      Not enough info to tell for sure

3. Two equal-mass bullets traveling with the same speed strike a target.  One of the bullets is rubber and bounces off.  The other is metal and penetrates, coming to rest in the target.  Which exerts the greater impulse on the target?

a)       the rubber bullet

b)       the metal bullet

c)       both exert the same

d)       not enough information

4. An open railroad car filled with coal is coasting frictionless.  A girl on board starts throwing the coal horizontally backward straight off the car, one chunk at a time.  The car: (more than one may be true)

a)       speeds up

b)       slows down

c)       speed remains at the same

d)       loses momentum

e)      momentum of car remains the same

f)       gains momentum

g)      loses KE

h)      gains KE

1. D

2. D

3. A

4. A, f, H

1.     (Velocity after a period of time)

V_f  =  V_o + at

2.      (Distance after a period of time)

X_f = V_ot  + 1/2 at²

3. (Velocity/distance/acceleration without time)

V_f² =  V_o² + 2aDX

4.    (center seeking acceleration or centripetal acceleration)

A_c = V² / r

5.     (Kinetic Energy)

KE = 1/2mV ² 

6.      (Change of momentum (Dr )=  Impulse)

D(mV) = D(f)(t)

7.      (Power with work)

P_avg =  W/t

8.      (Power with velocity)

P = F(V)

9.      (Force exerted by a springy)

F_s = KX

10.  (Potential energy of a spring)

U_s = 1/2kx²

11.  (period of a spring)

T_s = 2p √ (m/k)

12.  (period of a pendulum)

T_p = 2p √ (L/g)    or    2√ L

13.   (relationship between period and frequency)

T = 1/f

14.  (Newton’s Law of Gravitation)

F_g = G (m₁m₂ ) / r²

15.  Pressure (with atmosphere) of a liquid

 P = p_o  + r g h

16.  (Force of buoyancy)

F_buoy =  weight of Liq displaced = mg = rVg

17.  (Equation of continuity for a liquid)

A₁V₁ =  A₂V₂

18.      (Work & Energy)

 W = DPE + DKE

19.  (Bernoulli's Equation)

P₁ + rgy₁ + 1/2rv₁²  = P₂ + rgy₂ + 1/2rv₂²

20.  (Relationship of

        Press, Volume, Temp of a gas)

(P₁V₁) / T₁  =  (P₂V₂) / T₂

21.    (center seeking force)

 F_c =  Net force = m(V² / r)

22.    (Flow rate: v )

v = Volume/Time

Test Ch 7-10 Thursday/Friday!!! 

Test Equations Today 17 Nov