physics sags

Question 0

Scalar

Answer 0

A physical quantity that has magnitude only

Question 1

Vector

Answer 1

A physical quantity that has both magnitude and direction

Question 2

Resultant vector

Answer 2

The single vector which has the same effect as the original vectors working together

Question 3

Distance

Answer 3

The length of path travelled (scalar)

Question 4

Displacement

Answer 4

A change in position (vector, points from initial to final position)

Question 5

Speed

Answer 5

The rate of change of distance (scalar)

Question 6

Velocity

Answer 6

The rate of change of position
Or the rate of displacement
Vector

Question 7

Acceleration

Answer 7

The rate of change of velocity

Question 8

Coulomb’s law

Answer 8

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

Question 9

Electric field

Answer 9

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

Question 10

Electric field strength (magnitude)

Answer 10

The force per unit positive charge

Question 11

Weight Fg

Answer 11

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

Question 12

Normal force Fn

Answer 12

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

Question 13

Frictional force Ff

Answer 13

The force that opposes the motion of the object

Question 14

Newton’s first law

Answer 14

An object continues in a state of rest or uniform velocity unless it is acted upon by a resultant force

Question 15

Inertia

Answer 15

The property of an object that causes it to resist changes in its state of rest or uniform motion

Question 16

Newton’s second law

Motion

Answer 16

When a force Fnet is applied to an object 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 17

Newton’s second law

Momentum

Answer 17

The net force acting on an object is equal to the rate of change of momentum

Question 18

Newton’s third law

Answer 18

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

Question 19

Momentum

Answer 19

The product of the mass and velocity of the object

Question 20

The law of conservation of linear momentum

Answer 20

The total linear momentum of an isolated system remains constant

Question 21

Elastic collision

Answer 21

A collision in which both momentum and kinetic energy are conserved

Question 22

Inelastic collision

Answer 22

A collision in which only momentum is conserved

Question 23

Impulse

Answer 23

The product of the net force and the contact time

Question 24

Work

Answer 24

The product of the displacement and the component of the force parallel to the displacement

Question 25

Gravitational potential energy

Answer 25

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

Question 26

Kinetic energy

Answer 26

The energy an object has as a result of the objects motion

Question 27

Mechanical energy

Answer 27

The sum of gravitational potential and kinetic energy at a point

Question 28

The law of conservation of energy

Answer 28

The total energy in a system cannot be created or destroyed, only transferred from one form to another

Question 29

The principle of conservation of mechanical energy

Answer 29

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

Question 30

Work energy theorem

Answer 30

The work done by a net force on an object is equal to the change in kinetic energy of the object

Question 31

Power

Answer 31

The rate at which work is done | The rate at which energy is transferred

Question 32

1 Watt

Answer 32

The power when one joule of work is done in one second

Question 33

Efficiency

Answer 33

The ratio of output power to input power

Question 34

Newtons law of universal gravitation

Answer 34

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 35

Potential difference

Answer 35

The work done per unit positive test charge

Question 36

Current

Answer 36

The rate of flow of charge

Question 37

Ohms law

Answer 37

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

Question 38

Resistance

Answer 38

A materials opposition to the flow of electric current

Question 39

Emf

Answer 39

The total energy supplied per coulomb of charge by the cell

Question 40

Magnetic flux linkage

Answer 40

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

Question 41

Faradays law of electromagnetic induction

Answer 41

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

Question 42

Lenz's law

Answer 42

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

Question 43

Diode

Answer 43

A component that only allows current to flow in one direction

Question 44

The photoelectric effect

Answer 44

The process when light shines on a metal and electrons are ejected

Question 45

Threshold (cut off) frequency

Answer 45

The minimum frequency of incident radiation at which electrons will be emitted from a particular metal

Question 46

Work function

Answer 46

The minimum amount of energy needed to emit an electron from the surface of a metal Material specific

Question 47

One Volt

Answer 47

Is the potential difference between two points where 1J of work is done per coulomb of charge transferred from some point to the other.