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Flashcards in Physics Deck (56):
1

What is a beta particle

an electron

2

What is an alpha particle

a helium nucleus which is 2 protons and two neutrons

3

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

kinetic energy gained = potential energy lost

4

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

The normal

5

What is the formula for efficency

useful energy output / total energy input

6

What are the SI units of Power

Watts (W)

7

What are the SI Units of moments

Mewton meters (Nm)

8

Name three scalars

Length, mass, time, energy, speed

9

What is the formula for density

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

10

What is the mass number of an element /atom

The number of protons + the number neutrons

11

What is the formula for kinetic energy

1/2 m v2

12

What is the mass number of an alpha particle

4 (2 neutrons and 2 protons)

13

What is the formula which relates voltage, current and resistance

V = IR

14

What is the formula for momentum

momentum = mass x velocity

P = mv

15

What is the forumla for the critical angle of a substance

sin c = 1/refractive index

16

Give an example of a longitudinal wave

Sound,

17

What are the SI units of length

Meter (m)

18

What is the formual for the moment of a force

Moment = Force * perpendicular distance from the pivot

19

What is the formula for Acceleration

Acceleration = change in velocity / Time taken

20

What is the formula for electrical energy transferred

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

21

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

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

22

What are the SI units of acceleration

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

23

What is the period of a wave

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

24

What is the amplitude of a wave

The maximum displacement from the rest position

25

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

force = mass x acceleration

F = ma

26

What are the SI units of energy

Joules (J)

27

What is the formula for gravitational potential energy

mgh (mass x gravitational stength * difference in height)

28

What is a transvers wave

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

29

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

f = 1/t and t = 1/f

30

What is the difference between a vector and a scalar

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

31

What is the SI unit for work done

Joules (J) (work done is energy transferred)

32

What are the SI units of current

Amp

33

What is the formula for power

Power = Work done / time taken

34

What is a longitudinal wave

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

35

What is the formula for pressue in a liquid

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

36

What is the formula for electrical power

P = IV (power = current * voltage)

37

What is Snell's law (refractive index)

refractive index = sin(i) / sin ®

38

Name three vectors

velocity, acceleration, force, momentum, weight

39

What is the atomic number of an element / atom

The number of protons

40

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

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

41

What is the SI unit of charge

Coulomb

42

What is the unit of fequency

Hertz (Hz)

43

What is the formula for charge passing a point

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

44

What is the formula for work done

Force x distance (in the direction of the force)

45

What are the SI units of Force

Newtons (N)

46

What is the formula for speed or velocity

Speed = Distance moved / Time taken

47

What is the formula for weight

Weight = Mass x Stength of gravity

W = mg

48

What is the relationship between work, energy transferred and power

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

49

What is the symbolfor charge

Q

50

Give an example of a transverse wave

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

51

What is the frequency of a wave

The number of wave cycles passing a point per second

52

What is the formula for pressure

Pressure = force / area

53

What are the SI units of mass

kilogram (kg)

54

What is a watt in terms of Joules and seconds

Watts = Joules / second

55

What are the SI units of velocity

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

56

What is Hooke's law

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