Physics

Question 1

Gravitational potential energy

Answer 1

the energy an object possesses due to its position relative to a reference point.

Question 2

Kinetic energy

Answer 2

the energy an object has as a result of the object’s motion

Question 3

Mechanical energy

Answer 3

the sum of gravitational potential and kinetic energy at a point.

Question 4

Conservation of energy:

Answer 4

The total energy in a system cannot be created nor destroyed; only transferred from one form to another.

Question 5

Conservation of mechanical energy

Answer 5

In the absence of air resistance or any external forces, the mechanical energy of an object is constant.

Question 6

Coulomb’s law:

Answer 6

The force between two charges is directly proportional to the product of the charges and inversely proportional to the distance between the charges squared

Question 7

magnitude of the electric field at a point

Answer 7

the force per unit positive charge.

Question 8

Potential difference

Answer 8

the work done per unit positive charge.

Question 9

Current

Answer 9

the rate of flow of charge.

Question 10

Resistance

Answer 10

material’s opposition to the flow of electric current.

Question 11

Emf

Answer 11

the total energy supplied per coulomb of charge by the cell.

Question 12

Ohm’s Law:

Answer 12

Current through a conductor is directly proportional to the potential difference across the conductor at constant temperature

Question 13

Magnetic flux linkage

Answer 13

the product of the number of turns on the coil and the flux through the coil

Question 14

Faraday’s law of electromagnetic induction:

Answer 14

The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage)

Question 15

Lenz’s law:

Answer 15

The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux.

Question 16

vector

Answer 16

physical quantity that has both magnitude and direction

Question 17

scalar quantity

Answer 17

a physical quantity that has magnitude only

Question 18

resultant vector

Answer 18

the single vector which has the same effect as the original vectors acting together.

Question 19

Distance

Answer 19

Length of path travelled

Question 20

Displacement

Answer 20

change in position.

Question 21

Speed

Answer 21

the rate of change of distance.

Question 22

Velocity

Answer 22

the rate of change of position or rate of displacement.

Question 23

Acceleration

Answer 23

rate of change of velocity.

Question 24

Inertia

Answer 24

the property of an object that causes it to resist a change in its state of rest or uniform motion.

Question 25

Weight (Fg)

Answer 25

The gravitational force that the earth exerts on any object on or near its surface

Question 26

Normal force

Answer 26

The perpendicular force exerted by a surface on an object in contact with it.

Question 27

Frictional force

Answer 27

The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact

Question 28

Newtons first law

Answer 28

An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force

Question 29

Newtons second law

Answer 29

When a net force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass.

Question 30

Newtons Third law

Answer 30

When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.

Question 31

Newton’s Law of Universal Gravitation.

Answer 31

Every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

Question 32

Static frictional force

Answer 32

the force that opposes the tendency of motion of a stationary object relative to a surface.

Question 33

Kinetic frictional force

Answer 33

the force that opposes the motion of a moving object relative to a surface.