Newton’s Laws Of Motion & Momentum Flashcards
What is Newton’s First Law?
A body will remain at rest or move with constant velocity unless acted on by a resultant force
What is Newton’s Second Law?
The resultant force is equal to the rate of change in momentum
What is Newton’s Third Law?
If body A exerts a force on body B, the body B will exert a force on body A of equal magnitude but in the opposite direction
What are the requirements for Newtons 3rd Law?
- The pairs must act on different objects
- The pairs must be of the same type of force
What is momentum?
The product of mass and velocity
What is the equation for momentum?
p = mv
p = momentum (kg ms^-1)
m = mass (kg)
v = velocity (ms^-1)
What type of quantity is momentum?
Vector
What is the rate of change of momentum on a body equal to?
Net force
What is the force and momentum equation?
F = Δp / Δt
What is impulse?
The change in momentum
What is the area under a force-time graph equal to?
Impulse
What is the principle of conservation of momentum?
The total momentum before a collision is equal to the total momentum after a collision, providing no external forces are acting
What is an external force?
Forces that act on a structure from outside
What is a closed system?
A system with no external forces acting upon it
If a ball is hitting a wall, what is change in momentum due to?
Horizontal velocities only
How do p=mv and F =ma relate?
