Podcast
Questions and Answers
What does P equal in momentum?
What does P equal in momentum?
mv
Is momentum a vector quantity?
Is momentum a vector quantity?
True (A)
What is the SI unit of momentum?
What is the SI unit of momentum?
kg*m/s
A change in momentum takes ______ and _________
A change in momentum takes ______ and _________
What is the impulse momentum theorem?
What is the impulse momentum theorem?
What is F(delta)t equal to?
What is F(delta)t equal to?
What is impulse?
What is impulse?
To protect people in collisions, should time increase or decrease?
To protect people in collisions, should time increase or decrease?
What is the conservation of momentum formula?
What is the conservation of momentum formula?
Does total initial momentum equal total final momentum?
Does total initial momentum equal total final momentum?
In an isolated system, total momentum is ___________
In an isolated system, total momentum is ___________
In an isolated system, is total momentum conserved in all collisions?
In an isolated system, is total momentum conserved in all collisions?
In an isolated system, is individual momentum conserved?
In an isolated system, is individual momentum conserved?
For objects pushing away from each other, final momenta are ________ and __________
For objects pushing away from each other, final momenta are ________ and __________
Conservation of momentum follows from _____________
Conservation of momentum follows from _____________
What is F1 equal to?
What is F1 equal to?
What does F1(delta)t equal?
What does F1(delta)t equal?
What is a perfectly inelastic collision?
What is a perfectly inelastic collision?
In perfectly inelastic collisions, do objects have different final velocities?
In perfectly inelastic collisions, do objects have different final velocities?
In perfectly inelastic collisions, m1v1+m2v2 equals what?
In perfectly inelastic collisions, m1v1+m2v2 equals what?
In perfectly inelastic collisions, will total kinetic energy increase or decrease?
In perfectly inelastic collisions, will total kinetic energy increase or decrease?
Is kinetic energy conserved in perfectly inelastic collisions?
Is kinetic energy conserved in perfectly inelastic collisions?
What is an elastic collision?
What is an elastic collision?
Are most collisions elastic?
Are most collisions elastic?
Are most collisions perfectly inelastic?
Are most collisions perfectly inelastic?
Is kinetic energy conserved in elastic collisions?
Is kinetic energy conserved in elastic collisions?
Is kinetic energy conserved in inelastic collisions?
Is kinetic energy conserved in inelastic collisions?
In elastic collisions, what does (1/2)m1v1^2+(1/2)m2v2^2 equal?
In elastic collisions, what does (1/2)m1v1^2+(1/2)m2v2^2 equal?
Is momentum conserved in all collisions?
Is momentum conserved in all collisions?
If two things do not stick and kinetic energy is not conserved, what type of collision is it?
If two things do not stick and kinetic energy is not conserved, what type of collision is it?
What is the product of an object's mass and its velocity?
What is the product of an object's mass and its velocity?
How does the momentum of an object change if the object's velocity doubles?
How does the momentum of an object change if the object's velocity doubles?
What can determine the magnitude of the change in an object's momentum?
What can determine the magnitude of the change in an object's momentum?
Are most collisions inelastic?
Are most collisions inelastic?
When an inelastic material is in a collision, is some of the work done to deform the material converted to other forms of energy?
When an inelastic material is in a collision, is some of the work done to deform the material converted to other forms of energy?
Study Notes
Momentum Basics
- Momentum (P) is calculated as the product of mass (m) and velocity (v): P = mv.
- Momentum is a vector quantity, indicating it has both magnitude and direction aligned with velocity.
- The SI unit of momentum is kilograms times meters per second (kg*m/s).
Impulse and Force
- A change in momentum requires both force and time.
- The impulse-momentum theorem states that the impulse (F * Δt) is equal to the change in momentum (mv_f - mv_i).
- Impulse is defined as the product of force and the time interval during which it acts on an object.
Collision Safety
- To enhance safety during collisions, the time over which a collision occurs should be maximized.
Conservation of Momentum
- The conservation of momentum formula is represented as m1v1 + m2v2 = m1v1f + m2v2f.
- In an isolated system, the total initial momentum equals the total final momentum, which is conserved in all collisions.
- Individual momentum, however, is not conserved within isolated systems.
Collision Types
- For objects that push away from each other post-collision, their final momenta are equal and opposite.
- Conservation of momentum arises from Newton's third law of motion.
Inelastic and Elastic Collisions
- A perfectly inelastic collision occurs when two objects stick together after colliding; they share the same final velocity.
- In these collisions, the total kinetic energy decreases, indicating that kinetic energy (KE) is not conserved.
- Most real-world collisions are inelastic, which means some kinetic energy is transformed into other energy forms during deformation.
Characteristics of Collisions
- An elastic collision allows for the conservation of both total momentum and kinetic energy.
- In elastic collisions, the equation (1/2)m1v1^2 + (1/2)m2v2^2 = (1/2)m1v1f^2 + (1/2)m2v2f^2 holds true.
- When two objects collide without sticking together and kinetic energy is not conserved, it is classified as an inelastic collision.
Momentum Changes
- When an object's velocity doubles, its momentum also doubles.
- The magnitude of change in an object's momentum is influenced by the force applied and the time interval over which it is applied.
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Test your understanding of momentum and collisions with these flashcards. Each card covers essential concepts, definitions, and theorems related to momentum in physics. Perfect for students looking to reinforce their knowledge in a concise way.
