Transcript Momentum and Impulse - Zamora's Science Zone

Momentum and Impulse
6-1
Liner Momentum
Examine how force and the duration
of the collision between objects
affect their momentum.
Momentum describes an object’s
motion
SI units are the Kgms-1
Vector or scalar?
The bowling ball
and the dodge ball.
– Moving at the same
velocity, which has
more momentum?
Attempt Practice 6A, p. 209
Answers:
1. 2.5 x 103 Kgms-1 to the right
2. a. 1.2 x 102 Kgms-1 to the NW
b. 94 Kgms-1 to the NW
c. 27 Kgms-1 to the NW
3. 46 ms-1
A change in momentum takes force
and time
A change in momentum takes force
and time
Stopping the dump truck and the toy
truck moving down the same hill.
From these examples we see that
momentum (p) is closely related to
force (F).
A change in momentum takes force
and time
In simple terms:
1. Small force over long time can produce the same change
in momentum as a big force over a _______ time.
Follow-through in sports?
Attempt Practice 6B, p. 211
Answers:
1. 3.8 x 102 N to the right
2. 1.1 x 103 N upward
3. 16.0 kgms-1 to the south
4. a. 9.0 ms-1 to the right
b. 15 ms-1 to the left
Stopping time and distance depends on the
impulse-momentum theorem
If truck has twice
the mass.
And, the brakes
are assumed to
apply the same
force.
What affect does
this have on
stopping time and
stopping distance?
Empty Truck
Ft  p
Ft1  mvf  mvi
Truck w/ Load (2m)
Ft2  2mvf  2mvi
 m vi  2m vi

t1
t2
 2m vi t1
t 2 
 m vi
1
x1  vi  v f t1
2

t2  2t1
1
x2  vi  v f 2t1
2
Attempt Practice 6C, p. 213
Answers:
1. 5.33 s; 53.3 m to the west
2. a. 14 m/s to the north
b. 42 m to the north
c. 8.0 s
3. a. 1.22 x 104 N to the east
b. 53.3 m to the west
A change in momentum over a
longer time requires less force