Monday 15 Nov:

 

Target: Understanding Momentum

 

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. 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

 

 

 

3. A tank car coasting frictionless horizontally along the rails has a leak in its bottom and dribbles several thousand gallons of water onto the roadbed.  In the process it

a)       speeds up

b)       slows down

c)       gains momentum

d)       loses momentum

 

 

4. What happens to the momentum of a body of constant mass if while it’s traveling its kinetic energy is doubled?

a)       It doubles

b)       It remains the same

c)       It increases by a multiplicative factor of  square root of 2

d)       It decreases by a multiplicative factor of square root of 2

 

 

 

 

1.  D, momentum is conserved

2. A, a greater change of (D) Velocity

3. D, maintains the same speed

4. C

 

 

 

 

 

L# 21: 1,2, 4 - 6, 9-16   Due Mon 15 Nov (Momentum)

Lab: Specific Heat

L# 22: 1- 5, 7- 9, 12, 14 - 20   Due Wed 17 Nov

(Calculus: Derivative & Integration )

L# 23: 1-4, 8, 13, 15, 16, 18, 20   Due Fri 19 Nov

(Center of Mass)

 

Review Monday 22 Nov

Test  L# 19 - 23  Tues 23 Nov

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Simple Machine Project:

 

Requirements:

1. Individual

 

2. Build and its due Wed 24 Nov

(must be made and not just a store example)

 

2. Any size & any of the 6 types you want.

(as long as you can carry it by your self through the doorway)

 

3. One page paper explaining your simple machine and its use in History

 

 

 

 

 

 

 

. Bridge Contest:

  • Due by Friday Dec 17

 

 

 

 

Tower Contest:

  • Due by Friday Jan 7th

 

 

L#22

 

Derivative is slope at an instant in time.

 

 

 

Derivative:

The old exponent is brought down as a coefficient and the new exponent is the old one reduced by 1. Note: constants are = 0

 

 

Find Derivative:

 

Ex: 5t4  + 4t2  + 7      where t = 3

 

 

 

 

 

 

 

 

 

--> 4(5t3)  + 2(4t1)  + 0

 

      4(5)(27) + (2)(12) = 540 +24 = 564

 

 

 

 

 

 

 

 

 

 

 

 

 2t3  + 4t2  + 7t + 5      where t = 2

 

 

 

 

 

--> 3(2t2)  + 2(4t1)  + 7t0

 

      3(8) + (2)(8)  + 7 = 47

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Integral is area under the curve;

 

Increase the exponent by one and divide by new exponent. Note: Constants are considered as t0

 

 

Find Integral:  Integral:  (t = 3)

-2t2  + 3t  + 20

 

 

 

-2t3/3      + 3t2/2     + 20t1/1

-2(27)/3  + 3(9)/2  + 60 

= -18 + 13.5 + 60 

       = 55.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Integral:  (t = 3)

Increase the exponent by one and divide by new exponent.