Mechanics

Question 0

Vector + eg.

Answer 0

magnitude and direction eg. Velocity, displacement

Question 1

Scalar + eg.

Answer 1

Magnitude only eg. Time, mass, distance, speed

Question 2

The principle of conservation of momentum

Answer 2

States that in any closed system (of colliding bodies), the total momentum before the collision is equal to the total momentum after the collision

Question 3

Newton’s 1st law of motion

Answer 3

A body remains at rest or at a constant velocity unless a resultant force is acting on it

Question 4

Newton’s 2nd law of motion

Answer 4

The rate of change of momentum of a body is proportional to the applied force and takes place in the direction of that force

Question 5

Newton’s 3rd law of motion

Answer 5

To every action there is an equal and opposite reaction

Question 6

Newton’s law of universal gravitation

Answer 6

The force of attraction between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them

Question 7

Boyle’s law

Answer 7

When a fixed mass of gas is at a constant temperature, it’s pressure is inversely proportional to its volume

Question 8

Archimedes’ principle

Answer 8

When a body is immersed in a fluid, it experiences an up thrust (or apparent loss in weight) which is equal to the weight of the fluid it displaces

Question 9

Law of flotation

Answer 9

A floating body displaces its on weight of fluid

Question 10

Hooke’s law

Answer 10

The extension of an elastic material is directly proportional to the force producing that extension