Mechanics

Question 1

Define vector

Answer 1

A quanity with both magnitude and direction

Question 2

Define the conservation of energy

Answer 2

In a closed system with no external forces the energy of a system before an event is equal to the energy after the event

Question 3

Explain the conservation of momentum

Answer 3

In a closed system with no external forces the momentum of the system before an event is equal to the momentum of the system after the event

Question 4

What is elastic collision

Answer 4

The kinetic energy of a system before an event is equal to the kinetic energy of a system after the event

Question 5

What is inelastic collision

Answer 5

The kinetic energy of a system before an event isn’t equal to the kinetic energy of the system after an event.

Question 6

What is Newton’s first law

Answer 6

An object at a constant velocity will remain at a constant velocity unless acted on by a resultant force

Question 7

What is Newton’s second law

Answer 7

If an object is acted on by a resultant force it will accelerate. The acceleration is inversely proportional to the mass of the object and directly proportional to the force acting on it.

Question 8

What is Newton’s third law

Answer 8

Every action has an equal and opposite reaction. If an object experts a force on another, the second object will exert a force of equal magnitude but opposite direction on the other object.