The Newtonian World

Question 1

Unit of Linear Momentum

Answer 1

kgm/s

Question 2

Net Force

Answer 2

Equal to the rate of change of momentum

Question 3

Impulse of a force

Answer 3

The product of the force acting on a body and the time it is acting. Given by I = Ft

Question 4

Principle of the conservation of momentum

Answer 4

Total momentum before = total momentum after

Question 5

Perfectly Elastic Collision

Answer 5

In a perfectly elastic collision kinetic energy and momentum are conserved

Question 6

Inelastic Collision

Answer 6

A collision where momentum is conserved but kinetic energy is not.

Question 7

Radian

Answer 7

Unit of angle. One radian is the angle subtended at the centre of a circle by an arc of circumference which is equal in length to the radius of the circle.

Question 8

Gravitational Field Strength

Answer 8

Force per unit mass

Question 9

Newtons Law of Gravitation

Answer 9

The gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres of mass

Question 10

Newtons 1st Law

Answer 10

An object will remain at rest or continue travelling at a constant velocity unless acted upon by a force.

Question 11

Newtons 2nd Law

Answer 11

The rate of change of the momentum of an object is directly proportional to the resultant force acting upon it and the change in the momentum is in the same direction as the force.

Question 12

Newtons 3rd Law

Answer 12

When body A exerts a force on body B, body B exerts and equal and opposite force on body A.

Question 13

Geostationary Orbit

Answer 13

An orbit of the Earth made by a satellite that has the same time period as the rotation of the Earth and is in the equatorial plane

Question 14

Displacement

Answer 14

The displacement of a body undergoing SHM from the rest position.

Question 15

Amplitude

Answer 15

The maximum displacement from the rest of equilibrium position, measured in metres (m)

Question 16

Period

Answer 16

The time taken for one complete pattern of oscillation, measured in seconds.

Question 17

Frequency

Answer 17

The number of oscillations per unit time

Question 18

Phase Difference

Answer 18

A measure of the relationship between the pattern of vibration at two points

Question 19

Simple Harmonic Motion

Answer 19

When the acceleration a of an object is proportional to its displacement x and the acceleration is in the opposite direction to displacement.

Question 20

Pressure

Answer 20

Force per unit area

Question 21

Internal Energy

Answer 21

The sum of the random distribution of kinetic and potential energies associated with the molecules of a system.