7 - Laws of motion and momentum Flashcards
What is Newton’s first law?
An object will remain at rest or continue to move with a constant velocity unless it is acted upon by a resultant force.
What is Newton’s third law?
When two objects interact, they exert equal and opposite forces on each other.
What type of force is the force of two objects touching?
Electrostatic
repulsion of electrons in the atoms
What is the principle of the conservation of momentum?
For a closed system, the momentum in a certain direction remains constant.
Momentum before the collision = momentum after the collision
What is momentum?
The product of an objects mass and velocity
What happens in a perfectly elastic collision?
- Momentum is conserved
- Total energy is conserved
- Kinetic Energy is conserved
What happens in an inelastic collision?
- Momentum is conserved
- Total energy is conserved
- Kinetic Energy is NOT conserved
What is Newton’s second law?
The net force acting on an object is directly proportional to the rate of change of momentum and is in the same direction.
Why is momentum conserved, according to Newton’s laws?
3rd Law - interacting objects exert equal and opposite forces on each other (F, -F)
In contact for same amount of time
2nd Law - F = p/t -> p=Ft
Ft = -Ft
What is impulse?
A change in momentum
How is impulse represented on a force time graph?
The area under the graph
