PHYSICS PAPER ONE

Question 1

NEWTONS FIRST LAW OF MOTION

Answer 1

A body will remain in its state of rest or uniform velocity unless a non-zero net/ resultant force acts on it.

Question 2

NEWTONS SECOND LAW OF MOTION

Answer 2

when a net, resultant force acts on an object, the object will accelerate in the direction of the force at an acceleration directly proportional to the force and inversely proportional to the mass of the object.

Question 3

NEWTONS THIRD LAW OF MOTION

Answer 3

When object A exerts a force on object B object B simultaneously exerts a force of equal magnitude on object A in the opposite direction.

Question 4

NEWTONS UNIVERSAL LAW OF GRAVITATION

Answer 4

Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the squared distance between their centers.

Question 5

momentum of an object

Answer 5

the product of mass and velocity for that object

Question 6

conservation of linear momentum

Answer 6

the total LINEAR momentum of an ISOLATED SYSTEM remains CONSTANT

Question 7

work-energy theorem

Answer 7

The net/total work done on an object is equal to the objects change in kinetic energy,

Question 8

conservative force

Answer 8

work done in moving an object between two points is independent of path taken.
Example: gravitational force

Question 9

non-conservative force

Answer 9

The work done in moving an object between two points is dependent on the path taken.
Example: friction, air resistance, tension, F-applied

Question 10

Conservation of mechanical energy

Answer 10

The total mechanical energy (Gravitational potential energy and kinetic energy) in an isolated system remains constant

Question 11

Power

Answer 11

rate at which work is done or energy is expended (transferred or transformed)

Question 12

Coulombs Law

Answer 12

The magnitude of the force exerted by one point charge on another point charge is directly proportional to the product of the magnitudes of the charges and inversely proportional to the squared distance between them.

Question 13

electric field

and

Electric field at a point

Answer 13

region in space in which an electric charge experiences a force. Direction of an electric field at a point is the direction a positive test charge would move if placed at that point.

electrostatic force experienced per unit positive charge placed at that point

Question 14

Ohms law

Answer 14

the potential difference across a resistor is directly proportional to the current in the conductor at a constant temperature.

Question 15

power

Answer 15

rate at which work is done

Question 16

root mean square value of AC voltage (RMS)

Answer 16

the rms of an AC circuit is the voltage of a DC circuit that delivers the same energy output as the AC circuit

Question 17

photoelectric effect

Answer 17

the process whereby electrons are ejected from a metal surface when a light of suitable frequency is incident on the surface.

Question 18

Threshold frequency (Fo - meant to be subscript zero)

Answer 18

the minimum frequency of light needed to emit electrons from a certain metal surface

Question 19

Work function (Wo - meant to be subscript zero)

Answer 19

minimum energy that an electron in a metal surface needs to be emitted from the metal surface

Question 20

An atomic ABSORPTION spectrum is formed when…

Answer 20

certain frequencies of electromagnetic radiation that passes through a medium (eg a cold gas) is absorbed.

Question 21

an atomic EMISSION spectrum is formed when…

Answer 21

certain frequencies of electromagnetic radiation are emitted due to an atoms electrons making a transition from a high-energy state to a lower energy state.