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CLASS:
Momentum and Impulse POGIL – Day 2
1. Is momentum a vector or scalar quantity?_______________
2. An object is in MECHANICALEQUILIBRIUM. Does it have…
a. Inertia?__________________EXPLAIN:
b. Momentum?______________EXPLAIN:
3. An object is in DYNAMIC EQUILIBRIUM. Does it have…
a. Inertia?__________________EXPLAIN:
b. Momentum?______________EXPLAIN:
4. An object is in STATIC EQUILIBRIUM. Does it have…
a. Inertia?__________________ EXPLAIN:
b. Momentum?______________EXPLAIN:
Check Your Understanding
Express your understanding of the concept and mathematics of momentum by answering the following questions. SHOW
ALL WORK and USE YOUR FORMULA AND UNITS!
5. Determine the momentum of a ...
a. 60-kg halfback moving eastward at 9 m/s.
b. 1000-kg car moving northward at 20 m/s.
c. 40-kg freshman moving southward at 2 m/s.
6. A car possesses 20 000 units of momentum. What would be the car's new momentum if ...
a. its velocity was doubled.
b. its velocity was tripled.
c.
its mass was doubled (by adding more passengers and a greater load)
d. both its velocity was doubled and its mass were doubled.
7. A halfback (m = 60 kg), a tight end (m = 90 kg), and a lineman (m = 120 kg) are running down the football field.
Consider their ticker tape patterns below.
a. Compare the velocities of these three players. How many times greater are the velocity of the halfback and
the velocity of the tight end than the velocity of the lineman?
b. Which player has the greatest momentum? Explain.
STOP! Log onto http://tinyurl.com/rhsMomentumand CHECK your answers and thought process for #5-7.
If you need further explanation/clarification, CHECK IN with a teacher. Otherwise, it is assumed you understand!
7.2: Impulse Changes Momentum pg 87



If there is a net force, acceleration occurs. (F = ma)
If there is acceleration, then that means that velocity is changing.
Momentum = mass x velocity (as a formula, m v = p)
8. If the momentum of an object changes, either the __________________ or _____________________ or
____________________ change.
9. Suppose you know that an object’s momentum is changing, but its mass is constant… what can you infer?
a. ___________________________changes and ________________________________ occurs.
10. Acceleration is produced by _________________________________________.
 In Newton’s 2nd Law, we talked about a net force producing an acceleration …
 In other words, a net force changes velocity (since acceleration IS a change in velocity)
Now, we are going to take that concept 1 step further. Impulse occurs when a force is applied to an object
for a period of time. Impulse produces a change in momentum; more significantly, Impulse IS the change
in momentum, just like acceleration IS a change in velocity. See below for this concept in words and as a
formula:

Newton’s 2nd Law is:

Substitute the definition for acceleration:

Rearrange the parentheses

Substitute the symbol p for momentum
Move t to the other side of the equation ; impulse equals change in momentum

Or
11. The greater the force acting on an object, the greater its change in both
______________________________ and ________________________________________.
12. How long the force acts is also important. The longer period of time you apply a force to an object, the greater the
change in the object’s _________________________________.
13. The quantity force x time interval is called _______________________________.
b. A force sustained for a long time produces (more, less, or the same)________________________ change in momentum
than does the same force applied briefly.
c. Both force and time are important in changing an object’s momentum.
14. When you push with the same force for twice the time, you impart
_____________________the impulse and produce __________________ the change in momentum.
15. The greater the impulse exerted on something, the greater the change in _____________________.
16. True or false: Impulse = momentum. EXPLAIN
_________________________________________________________________________________________________
_______________________________________________________________________
REMEMBER…Impulse changes momentum, and impulse = the change in momentum. In other words…if you apply a
net force, for any time period, you will change the object’s momentum.
Ft = ∆ (mv) so Ft = m (vf– vi)
 If the change in momentum occurs over a long time, the force of impact is small.

If the change in momentum occurs over a short time, the force of impact is large.

When hitting either the wall or the haystack and coming to a stop, the momentum is decreased by the
same impulse.
• The same impulse does not mean the same amount of force or the same amount of time.
• It means the same product of force and time.
• To keep the force small, we extend the time.
CASE
1
CASE
2
WHAT?
Increase
Momentum
(usually
means
velocity
increases)
HOW?
Apply the
greatest
force for
the
longest
time
Decrease
Momentum
(usually
means
velocity
decreases)
Minimize
forces by
increasing
stopping
time
LIST SOME REALLIFE EXAMPLES?
Maximize
forces
while
decreasing
stopping
time
Plug & Chug / Think &Solve Questions pg 101- 102 - attach loose leaf if needed
#
For complete notes, you should probably jot down the question as well as your answer
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33
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READ CAREFULLY!