Conceptual Physics Applied
Study Guide Section 4.3
Name: ________________________
Date: _________________________
69 Points
Block/Day: ____________________
Directions: Complete the following package by filling in blanks and/or providing solutions to
problems. Answers can be found in your textbook or your notes from class. Example problem
solutions can be found in the textbook and your notes from class. Unless otherwise noted, each
blank is worth one point.
A _____________________occurs when two or more objects hit each other. During a collision,
__________________ and ______________ are transferred from one object to another. Different
factors like __________, initial velocity and the ___________ of collision determine the velocity of
objects after they collide.
There are two main types of collisions, ___________ and _________________. When an elastic
collision occurs, objects bounce off each other with no loss in the total __________________
_________________ of the system.
In an inelastic collision, objects change ______________ or ____________ together, and the total
kinetic energy of the system _____________________. The energy is not destroyed, but it is
___________________ into forms other than kinetic energy, such as _________________ change in
shape.
Give one example of an elastic collision and one example of an inelastic collision (4 points).
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As long as there are no outside forces (such as friction), ________________________ is conserved
in both elastic and inelastic collisions.
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What is the formula for an inelastic collision? (7 points)
Label each quantity with units for seven extra credit points.
An 6,000 kg train car moves to the east at 5 m/s. It collides with a 4,000 kg car at rest. The cars
couple together and roll along the track. How fast do they move after the collision? (6 points)
Looking for:
Solution (includes work):
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Given:
Relationship:
Collisions create __________________ because the colliding objects’ motion _________________.
Momentum conservation can be used to estimate the forces in a collision.
A rubber ball and a clay ball are dropped on a floor. The rubber ball has a mostly________________ collision and bounces back with almost the same speed it had when it hit the
floor.. The clay ball has an ______________________________ collision, hitting the floor and
staying there.
The total change in momentum is equal to the _____________ multiplied by the __________ during
which the force acts. Remember the product of force and time is called __________________.
Suppose each ball described above has a mass of 1 kg and hits the floor at a velocity of -5 m/s.
The __________________________ of the clay ball changes from – 5 m/s to 0 m/s. This is a
change of ______ kg x m/s. The rubber ball also starts with a _________________________ of -5
kg x m/s. If the collision is an _____________________ collision, it bounces up with the same
momentum but in the ______________________ direction. The momentum goes from -5 kg x m/s
to +5 kg x m/s, a change of ________ kg x m/s. The rubber ball has ___________ the change in
momentum. The momentum change is always _________________ when objects bounce,
compared to when they do not _____________________.
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Write the formula for impulse problems. (6 points) Label each quantity with units for 6 extra
credit
A 2 kg clay ball hits the floor with a velocity of -10 m/s and comes to a stop in 0.2 s. What force
did the floor exert on the ball?
Looking for:
Solution (includes work):
Given:
Relationship:
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The relationship between ____________________, force and time has been used by auto
manufacturers to make vehicles ___________________ in accidents. When a car stops its
momentum drops to ___________. Car bodies are designed to ______________ in a collision to
extend the stopping time.
Air bags work together with _______ ____________ to make cars safer. An air bag ____________
when the force applied to the front of a car reaches a specific level. The air bag deflates
______________________ as the person’s body applies a force to the bag upon ___________. The
force of impact pushes the air out of small holes in the air bag bringing the person to a
_____________________ stop.
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