Physics Flashcards Preview

Revision > Physics > Flashcards

Flashcards in Physics Deck (56)
Loading flashcards...
1
Q

What is a beta particle

A

an electron

2
Q

What is an alpha particle

A

a helium nucleus which is 2 protons and two neutrons

3
Q

What is the relationwhicp between kinetic energy and gravitational potential energy in a falling object

A

kinetic energy gained = potential energy lost

4
Q

Where do you measure the angles of incidence, reflection and refraction from

A

The normal

5
Q

What is the formula for efficency

A

useful energy output / total energy input

6
Q

What are the SI units of Power

A

Watts (W)

7
Q

What are the SI Units of moments

A

Mewton meters (Nm)

8
Q

Name three scalars

A

Length, mass, time, energy, speed

9
Q

What is the formula for density

A

Density = mass / volume (rho, &rho = m/v)

10
Q

What is the mass number of an element /atom

A

The number of protons + the number neutrons

11
Q

What is the formula for kinetic energy

A

1/2 m v2

12
Q

What is the mass number of an alpha particle

A

4 (2 neutrons and 2 protons)

13
Q

What is the formula which relates voltage, current and resistance

A

V = IR

14
Q

What is the formula for momentum

A

momentum = mass x velocity

P = mv

15
Q

What is the forumla for the critical angle of a substance

A

sin c = 1/refractive index

16
Q

Give an example of a longitudinal wave

A

Sound,

17
Q

What are the SI units of length

A

Meter (m)

18
Q

What is the formual for the moment of a force

A

Moment = Force * perpendicular distance from the pivot

19
Q

What is the formula for Acceleration

A

Acceleration = change in velocity / Time taken

20
Q

What is the formula for electrical energy transferred

A

E = ItV (power = IV and energe is power * time)

21
Q

What is the formula for the refractive index of a substance in terms of the speed of light

A

refractive index = speed of light in a vacuum/ speed of light in the substance

22
Q

What are the SI units of acceleration

A

meters per second per second (m/s2 or ms-2)<p></p>

23
Q

What is the period of a wave

A

the time take for a full cycle of the wave to pass a point

24
Q

What is the amplitude of a wave

A

The maximum displacement from the rest position

25
Q

What is the formula for Force (Newton’s second law)

A

force = mass x acceleration

F = ma

26
Q

What are the SI units of energy

A

Joules (J)

27
Q

What is the formula for gravitational potential energy

A

mgh (mass x gravitational stength * difference in height)

28
Q

What is a transvers wave

A

One where the direction of oscillation is perpendicular (at right angles to) the directin of travel

29
Q

What is the relation ship between a wave’s frequency (f) and its period (t)

A

f = 1/t and t = 1/f

30
Q

What is the difference between a vector and a scalar

A

A vector has a magnitude and a direction, a scalar only has a magnitude

31
Q

What is the SI unit for work done

A

Joules (J) (work done is energy transferred)

32
Q

What are the SI units of current

A

Amp

33
Q

What is the formula for power

A

Power = Work done / time taken

34
Q

What is a longitudinal wave

A

One where the oscillation (vibrations) are parallel to the direction of travel of the wave

35
Q

What is the formula for pressue in a liquid

A

pressure = density * depth * gravity (p= &rho * h * g)

36
Q

What is the formula for electrical power

A

P = IV (power = current * voltage)

37
Q

What is Snell’s law (refractive index)

A

refractive index = sin(i) / sin ®

38
Q

Name three vectors

A

velocity, acceleration, force, momentum, weight

39
Q

What is the atomic number of an element / atom

A

The number of protons

40
Q

What is the formula relatin the velocity of a wave to its frequency and wavelength

A

v = f * λ (velocity = frequency * wavelength)

41
Q

What is the SI unit of charge

A

Coulomb

42
Q

What is the unit of fequency

A

Hertz (Hz)

43
Q

What is the formula for charge passing a point

A

Q = It (charge = current * time) so I = Q/t so current is chages passing per second

44
Q

What is the formula for work done

A

Force x distance (in the direction of the force)

45
Q

What are the SI units of Force

A

Newtons (N)

46
Q

What is the formula for speed or velocity

A

Speed = Distance moved / Time taken

47
Q

What is the formula for weight

A

Weight = Mass x Stength of gravity

W = mg

48
Q

What is the relationship between work, energy transferred and power

A

work is the energy transferred, power is the energy transferred per second, so power is also work done per second

49
Q

What is the symbolfor charge

A

Q

50
Q

Give an example of a transverse wave

A

electromagnetic ratiation (e.g. light), waves on the surfave of water

51
Q

What is the frequency of a wave

A

The number of wave cycles passing a point per second

52
Q

What is the formula for pressure

A

Pressure = force / area

53
Q

What are the SI units of mass

A

kilogram (kg)

54
Q

What is a watt in terms of Joules and seconds

A

Watts = Joules / second

55
Q

What are the SI units of velocity

A

meters per second (m/s or ms-1)<p></p>

56
Q

What is Hooke’s law

A

The extension is proportional to the force applied (if the elastic limit is not reached)