Newton’s Laws And Momentum Flashcards
What is Newton’s First Law?
A body will remain at rest or continue moving in a straight line at constant velocity unless acted on by a resultant force.
What is Newton’s Second Law?
The rate of change of momentum of a body is equal to the resultant force and in the same direction.
What is Newton’s Third Law?
If body A exerts a force on body B then body B exerts an equal and opposite force on body A of the same type.
What are features of Newton’s Third Law?
Pair of forces have equal magnitude
Pair of forces act in opposite directions
The force acts on 2 different bodies (A and B)
Same type of force is acting on the 2 bodies
Define impulse
The product of force and time for which the force acts.
What is the equation for impulse?
ΔP = FΔt
How and from what graph can you calculate impulse?
From a force time graph, impulse is the area under the graph.
State the principle of conservation of linear momentum
For any collision, the total initial momentum is equal to the total final momentum, if there are no external forces.
What is the equation for principle of conservation of linear momentum?
ΔP1 = -ΔP2
mv1 - mu1 = mv2 - mu2
What is an elastic collision?
A collision where total kinetic energy is conserved.
What is an inelastic collision?
A collision where total kinetic energy is not conserved.
What is true about all collisions?
Total energy and momentum are conserved.
What happens in terms of energy and momentum in an explosion?
There is a gain in kinetic energy due to the energy of the explosion. Total momentum is conserved.
