an object at rest will remain at rest, and an object travelling at a constant velocity will remain travelling at a constant velocity unless acted on by an external resultant force
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define newtons second law of motion
the force acting on an object is equal to the acceleration produced multiplied by the objects mass.
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define newtons third law of motion
if body a exerts a force on body b, body b will exert an equal and opposite force on body a.
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define linear momentum
the product of mass and velocity. As velocity is a vector and a component of momenm=tum, so muct momentum be a vector.
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define net force on a body.
the rate of change of momentum. f = (delta p) / (delta t)
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F = ma
this is a special case of newtons second law when mass remains constant
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define the impulse of a force
the force multiplied by the time over which the force is applied
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what is shown by the area underneath a force against time graph?
impulse of the force.
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give an equation that defines impulse
I=mv-mu, Impulse = change in momentum
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state the principle of conservation of momentum
A principle stating that the total linear momentum of an isolated system remains constant regardless of changes within the system.
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define a perfectly elastic collision
momentum and kinetic energy are conserved and the relative speed of approach is equal to the relative speed of seperation
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define a perfectly inelastic collision
all momentum is conserved, kinetic energy is not conserved and the relative speed of separation is zero (they stick together)
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define an inelastic collision
all momentum is conserved, kinetic energy is not conserved, use the principle of conservation of momentum to calculate speed of approach/separation
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what happens to the kinetic energy in a collision?
in an elastic collision it is conserved, in other types of collision it is not.
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Other cards in this set
Card 2
Front
define newtons second law of motion
Back
the force acting on an object is equal to the acceleration produced multiplied by the objects mass.
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