06 Momentum Flashcards
(21 cards)
What is the definition of momentum?
The momentum of an object is equal to its mass x velocity.
What is the unit for momentum?
Kg m s‐¹
What is the symbol for momentum?
p
What is the formula for momentum?
not on formula sheet
Momentum = mass x velocity
p = m x v
Is momentum a vector or scalar quantity?
Vector
What does it mean if multiple vehicles have the same momentum?
The same amount of force and time would be required to bring the vehicles to rest
What is the principle of the conservation of momentum?
The total momentum of an isolated system remains constant provided no external resultant force acts on the system.
What are the 3 types of collisions?
-elastic collision
-partially inelastic collision
-fully inelastic collision
What is an elastic collision?
No overall loss of kinetic energy; objects rebound in opposite directions after collision.
What is a partially inelastic collision?
Some overall loss of kinetic energy; objects don’t stick together.
What are fully inelastic collisions?
Some overall loss of kinetic energy; objects stick together after collision.
What is the first step of a principle of conservation of momentum questions?
Write:
Momentum before collision= momentum after collision
Why should you repeat experiments several times?
-to reduce random error
-identify and remove/repeat anomalies.
What does Σ mean?
Sigma- sum of
How can Newton’s second law be expressed in terms of momentum?
Resultant force = rate of change in momentum
What does Ft=mv show to make a golf ball experience a bigger momentum change?
Either hit the ball with a greater force or increase contact time with the ball (or both).
In F vs t graphs what is mv equal to?
The area (Ft)
In Force vs time graphs, what is the area between the line and the time axis equal to?
Impulse and momentum change
What is the definition of an impulse?
The product of force and time.
If the time of the collision is increased what does the average force do?
Decrease
What is newton’s 1st law of motion?
An object remains at rest or moves with constant velocity unless acted upon by a resultant force.
