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Questions and Answers
What is the symbol for Linear Momentum?
P (slanted P)
What is the equation for Linear Momentum?
P = mv
Is Linear Momentum a scalar or vector?
True
What are the units for Linear Momentum?
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More mass causes the object to move slower.
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More mass causes more momentum.
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A quantity defined as the product of an object's mass and its velocity.
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It takes less force to change the motion of an object with greater momentum.
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What is the impulse momentum theorem?
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What is impulse?
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Impulse is equal to the ________ of the object acted on.
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Impulse is the product of the _____ and the _____ over which the force acts on an object.
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Longer contact time equals less impulse.
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Longer contact time equals more impulse equals _____ change in momentum.
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When are changes in momentum used?
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When 2 or more objects interact, the ____ of the closed, isolated system remains the same.
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What is the equation for momentum conservation?
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Friction will be ignored for momentum conservation problems.
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Momentum is also conserved for objects ______.
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As long as there are no _____ acting on the system, the total momentum remains constant.
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The total momentum of any system of objects interacting with one another remains constant regardless of the ___ of the forces between the objects.
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What happens when two objects collide and move together as one mass?
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What is the equation for an inelastic collision?
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Pay attention to the ______ in collisions.
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KE is conserved in inelastic collisions.
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KE becomes _____ or _______ if the object deforms.
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Loss of KE can be calculated using _______ to find _____ (-KE means loss).
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What happens to objects after a collision in an elastic collision?
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KE before and after the collision is the same in an elastic collision.
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A collision in which the final kinetic energy is less than the initial kinetic energy is called what?
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A collision in which the bodies stick together after the collision is called what?
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What is a collision between ideally elastic bodies?
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Study Notes
Linear Momentum
- Symbol for Linear Momentum is P (slanted P).
- Equation for Linear Momentum: P = mv, where m is mass and v is velocity.
- Linear Momentum is a vector quantity, meaning it has both magnitude and direction.
- Units for Linear Momentum are kgâ‹…m/s.
- Increasing mass results in the object moving faster.
- More mass results in more momentum.
Impulse and Momentum Change
- Defined as the product of an object's mass and its velocity.
- Greater momentum requires more force to change motion compared to lower momentum.
- Impulse-Momentum Theorem: F∆t = ∆p, where F is force, ∆t is time interval, and ∆p is change in momentum.
- Impulse is the change in momentum caused by a constant external force acting over time.
- Impulse can be calculated using the product of force and time.
- Longer contact time increases impulse and results in a greater change in momentum.
Applications and Conservation
- Changes in momentum are relevant in sports and safety devices like airbags.
- In a closed, isolated system, the net momentum remains constant during interactions.
- Momentum conservation equation: m1v1i + m2v2i = m1v1f + m2v2f.
- External forces, such as friction, are generally ignored in momentum conservation problems.
- Momentum is conserved for objects pushing away from each other.
Collisions
- Two primary types of collisions: inelastic and elastic.
- Inelastic collisions occur when two objects collide and move together as a single mass; KE is not conserved.
- Inelastic collision equation: m1v1i + m2v2i = (m1 + m2)vf.
- The sign of velocities in collisions is important for calculations.
- Kinetic Energy (KE) can convert to sound or internal energy if deformation occurs during an inelastic collision.
- The loss of KE can be evaluated using momentum conservation to determine final velocities.
Specific Collision Types
- Elastic collision: objects remain separate after the collision and KE is conserved; initial and final KE values are the same.
- Perfectly inelastic collision: bodies stick together after the collision, resulting in a loss of KE.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of momentum with these flashcards that cover the fundamentals such as definitions, equations, and units. Perfect for students needing a quick review or study aid for Physics Chapter 6.