Momentum and Impulse 6-1. Liner Momentum Examine how force and the duration of the collision between...
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Transcript of Momentum and Impulse 6-1. Liner Momentum Examine how force and the duration of the collision between...
Liner MomentumLiner Momentum
Examine how force and the duration Examine how force and the duration of the collision between objects of the collision between objects affect their momentum.affect their momentum.
Momentum describes an object’s Momentum describes an object’s motionmotion
SI units are the Kgms-1
Vector or scalar?
The bowling ball The bowling ball and the dodge ball.and the dodge ball.– Moving at the same Moving at the same
velocity, which has velocity, which has more momentum?more momentum?
Attempt Practice 6A, p. 209 Answers:
1. 2.5 x 103 Kgms-1 to the right
2. a. 1.2 x 102 Kgms-1 to the NW
b. 94 Kgms-1 to the NW
c. 27 Kgms-1 to the NW
3. 46 ms-1
A change in momentum takes force A change in momentum takes force and timeand time
Stopping the dump truck and the toy Stopping the dump truck and the toy truck moving down the same hill.truck moving down the same hill.
From these examples we see that From these examples we see that momentum (momentum (pp) is closely related to ) is closely related to force (force (FF).).
A change in momentum takes force A change in momentum takes force and timeand 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 kgms-1 to the south
4. a. 9.0 ms-1 to the right
b. 15 ms-1 to the left
Stopping time and distance depends on the Stopping time and distance depends on the impulse-momentum theoremimpulse-momentum theorem
If truck has twice If truck has twice the mass.the mass.And, the brakes are And, the brakes are assumed to apply assumed to apply the same force.the same force.What affect does What affect does this have on this have on stopping time stopping time andand stopping distance?stopping distance?
ptF
if mvmvtF 1 if mvmvtF 222
21
2
t
mv
t
mv ii
i
i
mv
tmvt
12
212 2 tt
11 2
1tvvx fi 12 2
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1tvvx fi
Empty Truck Truck w/ Load (2m)
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