قوانين Flashcards
(25 cards)
What is the definition of momentum?
Momentum is the product of the mass and velocity of an object.
True or False: Momentum is a vector quantity.
True
What is the formula for linear momentum?
The formula for linear momentum is p = mv, where p is momentum, m is mass, and v is velocity.
Fill in the blank: The law of conservation of momentum states that the total momentum of a closed system remains ______.
constant
What happens to momentum in a perfectly elastic collision?
In a perfectly elastic collision, both momentum and kinetic energy are conserved.
In an inelastic collision, which quantity is conserved?
Momentum is conserved, but kinetic energy is not.
What is the unit of momentum in the International System of Units (SI)?
The unit of momentum is kilogram meter per second (kg·m/s).
True or False: A stationary object has momentum.
False
What is the relationship between impulse and momentum?
Impulse is equal to the change in momentum of an object.
Fill in the blank: Impulse can be calculated as the product of ______ and time.
force
What is the formula for impulse?
Impulse (J) is calculated as J = FΔt, where F is force and Δt is the time interval.
In a collision, if two objects stick together, what type of collision is it?
It is called a perfectly inelastic collision.
True or False: Momentum can be transferred from one object to another.
True
What is the equation for the conservation of momentum in a two-object system?
m1v1 + m2v2 = m1v1’ + m2v2’, where the primes denote final velocities.
What does ‘m1’ represent in the momentum equation?
‘m1’ represents the mass of the first object.
Fill in the blank: The total momentum before a collision equals the total momentum ______ the collision.
after
What is the principle of conservation of momentum?
The principle states that the total momentum of an isolated system remains constant if no external forces act on it.
True or False: Momentum depends on the frame of reference.
True
What is meant by ‘net external force’ in the context of momentum?
Net external force refers to the total force acting on a system from outside sources.
What is the effect of an external force on momentum?
An external force can change the momentum of an object.
Fill in the blank: The momentum of an object increases with an increase in its ______.
velocity
What is the significance of a ‘zero momentum’ state?
A zero momentum state indicates that an object is at rest or that the momenta of all objects in a system cancel each other out.
True or False: In a closed system, momentum can be created or destroyed.
False
What does the term ‘elastic collision’ imply about kinetic energy?
In an elastic collision, kinetic energy is conserved along with momentum.
