3.5 Newton's laws of motion and momentum Flashcards
If an object is in equilibrium it means the
object is…
Not accelerating; it is either:
● Stationary
● Moving at a constant velocity
Which of Newton’s Laws state ‘every
action force has an equal and opposite
reaction force
Newton’s third law.
What is Newton’s second law?
F = ma
The resultant force of an object is proportional to the rate of change of momentum of the object and in the same direction.
What is Newton’s first law?
An object at rest or moving with constant velocity will stay that way unless a resultant force acts upon it.
What is the difference between elastic
and inelastic collisions?
In an elastic collision, the kinetic energy before is
equal to the kinetic energy afterwards – no energy
is lost.
However, in an inelastic collision, the kinetic energy
at the end is not equal to the kinetic energy at the
start – some energy is lost to the surroundings.
Give an equation that can be used to
calculate momentum.
momentum = mass × velocity
True or false: linear momentum is only
conserved in elastic collisions.
False, linear momentum is always
conserved.
The rate of change of momentum can
also be described as…
Resultant force.
What is impulse?
The change in momentum:
F∆t = ∆(mv)
What does the area underneath a
force-time graph stand for?
Impulse, the change in momentum
What is meant by the principle of
conservation of energy?
Energy cannot be created or destroyed, only
transferred into other forms of energy.
Therefore the total every in a closed system
would always remain the same.
What is the equation used for the
principle of conservation of momentum in
one-dimensional collisions?
m1u1 + m2u2 = m1v1 + m2v2
