Physics revision

Question 1

What is terminal velocity?

Answer 1

the maximum velocity that an object can achieve when it is falling through air.

Question 2

what is the age of the universe?

Answer 2

14 billion years old

Question 3

what is the big bang theory?

Answer 3

the big bang theory is a theory that everything inside the universe is compacted into a single point and eventually exploding into whats called a big bang

Question 4

define work done

Answer 4

the amount of force needed to move an object a certain distance

Question 5

Units used for acceleration?

Answer 5

ms^-2

Question 6

What is free fall?

Answer 6

An object that is moving only because of the action of gravity

Question 7

Define Weight

Answer 7

weight is defined as the force of gravity acting upon an object

Question 8

define instantaneous speed

Answer 8

the speed of an object at a moment in time.

Question 9

Define gravitational field strength

Answer 9

gravitational field strength is a force exerted by gravity around every mass

Question 10

define gravitational potential energy

Answer 10

The work done moving a 1kg mass in a certain distance

Question 11

Explain how a rocket moves using Newtons third law

Answer 11

(For every action there is an equal and opposite reaction) The rocket engines exert a force on the gas downwards, the gases exert an equal and opposite force on the rocket engine causing the rocket to move.

Question 12

what is a star?

Answer 12

a star is a ball of gas held together by its gravity

Question 13

difference between distance and displacement?

Answer 13

distance is how far a destination is while displacement is the direct length of two points

Question 14

examples of scalars and vectors?

Answer 14

scalar - speed density distance mass energy. vectors - displacement acceleration force momentum weight.

Question 15

what is the solar system?

Answer 15

planets that orbit around a sun

Question 16

What is friction?

Answer 16

a force that resists motion between two surfaces in contact

Question 17

formula for calculating velocity?

Answer 17

v = d / t (d = displacement divided by t = time)

Question 18

Define Mass

Answer 18

mass is defined as the total amount of matter in an object

Question 19

how are the altitude and period of satelites related?

Answer 19

the orbital period increases when the altitude increases

Question 20

formula for kinetic energy?

Answer 20

ek = 1/2 mv^2 (m = mass v = velcoity squared)

Question 21

What does Newtons first law state?

Answer 21

an object remains in the same state of motion unless a resultant force

Question 22

why is the theoretical value different (lower) than the actual value obtained through expermients?

Answer 22

energy is being lost when conducting an experiment due to some of it being lost in your surroundings

Question 23

What formula is used to calculate weight?

Answer 23

W = mg

Question 24

units of energy?

Answer 24

Joule (J)

Question 25

define kinetic energy

Answer 25

the energy an object obtains by motion

Question 26

difference between a vector and a scalar?

Answer 26

vectors are scalars with a direction however scalars are quantities of magnitude

Question 27

how to calculate a light year in metres?

Answer 27

3.8 x 10^8 x 365.25 x 24 x 60 x 60 = 9.47 x 10^15 x 4.2 = 3.977^16

Question 28

evidence for the big bang theory?

Answer 28

some of our stars nearly match the approximate age of our universe spanning from being 13 billion years old

Question 29

what is a galaxy?

Answer 29

a galaxy is a massive collection of stars

Question 30

define the period of the satellite?

Answer 30

the total time to make one full rotation around the earth

Question 31

formula for work done?

Answer 31

ew = fd (e bottom w is equal to force multiplied by the distance)

Question 32

What does Newtons third law state?

Answer 32

for every action in nature there is an equal opposite reaction

Question 33

what are the units for specific latent heat?

Answer 33

Jkg^-1

Question 34

what can line spectra tell us about a star?

Answer 34

it can tell us the main elements that a star may contain e.x helium

Question 35

formula for specific latent heat?

Answer 35

E = ML (M = mass L = specific latent heat (can be found in data sheet) E = Energy)

Question 36

describe and explain the vertical motion of a projectile

Answer 36

The vertical motion of a projectile is controlled by the force of gravity

Question 37

what is a geostationary satellite?

Answer 37

a satellite that rotates in the same direction as the earth

Question 38

how to calculate the resultant force of two vectors at right angles?

Answer 38

using pythagoras theorem you can calculate the two vectors at right angles

Question 39

What is the unit of force?

Answer 39

Newtons (N)

Question 40

units of speed and velocity?

Answer 40

m/s

Question 41

what is a continous light spectrum and how can it be produced?

Answer 41

the continious light spectrum contains all wavelengths of light in a certain range and can be produced by a light source

Question 42

following types of spectra?

Answer 42

continious emission and absorption spectras

Question 43

define velocity

Answer 43

the objects speed in a particular direction

Question 44

Detectors of the e-m spectrum

Answer 44

Radio - aerial Micro - aerial Infra-red - CCD Visible light - CCD or retina in our eyes UV - Fluorescent dye X-rays - Photographic film Gamma ray - Geiger muller tube

Question 45

define the period of a satellite

Answer 45

The time taken by a satellite to complete one full orbit around the earth

Question 46

state the law and conservation of energy

Answer 46

energy cannot be created nor destroyed but can be changed to one form or another

Question 47

What does Newtons second law state?

Answer 47

the acceleration of an object increases if the resultant force on it increases, and decreases if the mass of the object increases

Question 48

explain how the force of gravity keeps a satellite in orbit

Answer 48

the satellite is being pulled towards earth thus keeping it at a curved path