Headstart

Question 1

What is the equation for velocity, using displacement and time

Answer 1

V =s/t

V - ms^-1
S - m
t - s

Question 2

What is the equation for acceleration using velocity and time?

Answer 2

a = (v-u)/t

a - ms^-2
v - ms^-1
u - ms^-1
t - s

Question 3

What is the value of acceleration due to gravity?

Answer 3

-9.81 ms^-1

Question 4

How to find the velocity form a displacement-time graph?

Answer 4

Velocity = gradient = change in displacement/change in time

Question 5

What is Newton’s second law?

Answer 5

F = m x a

F - N
m - kg
a - ms^-2

Question 6

What is the equation for kinetic energy

Answer 6

E(k) = 0.5 x m x v^2

E(k) - J
m - kg
v - ms^-1

Question 7

What is the equation for gravitational potential?

Answer 7

E(p) = m x g x h

E(p) - J
m - kg
g - 9.81
h - m

Question 8

What is the principle of energy?

Answer 8

Energy cannot be created or destroyed- it can only be converted into other forms

Question 9

What is the equation for work done involving force and distance?

Answer 9

W = F x s

W - J
F - N
s - m

Question 10

What does work done mean in regards to GPE and KE?

Answer 10

Work done = increase in GPE and KE

Question 11

What is power?

Answer 11

Power is the work done per unit time

Question 12

What is the equation for power using work done?

Answer 12

P = W/t

P - W
W - J
t - s

Question 13

What is the equation for power using force?

Answer 13

P = F x v

P - W
F - N
v - ms^-

Note: ONLY true when object is moving at constant speed in same direction as the force

Question 14

What is Hooke’s Law?

Answer 14

F = k x difference in l

F - N
k - Nm^-1
l - m

Question 15

What is the limit of proportionality?

Answer 15

The maximum force that can be applied to a spring and it will still extend proportionally

Question 16

What is the equation for electric current?

Answer 16

I = Q/t

I - A
Q - C
t - s

Question 17

What is the equation for potential difference across components?

Answer 17

V = W / Q

V - V
W - J
Q - C

Question 18

What is Kirchhoff’s First Law?

Answer 18

The sum of the currents going into the junction = the sum of the currents going out —> current is same everywhere in series circuit, shared in parallel circuit

Question 19

What is Kirchhoff’s 2nd Law?

Answer 19

For any closed loop in a circuit, the sum of the potential differences across the components equals the potential difference of the power supply

Question 20

What is the equation for resistance?

Answer 20

R = V/I

R - ohms
V - V
I - A

Question 21

What is Ohms Law

Answer 21

Potential difference is proportional to Current when temperature is constant. (Eg of ohmic component - resistor

Question 22

What does a Current-Pd (I-V) graph look like for an ohmic component?

Answer 22

Straight line, with gradient equal to 1/resistance of component, goes through origin

Question 23

What does a current-pd (I-V) graph look like for a non-ohmic component look like?

Answer 23

1) filament lamp - as pd across lamp increases, filament gets hotter, resistance increases
2) diode - only let current flow one way, resistance is very high in other direction

Question 24

What is power?

Answer 24

Power is the rate of transfer of energy

Question 25

What is the equation of finding power from current and pd

Answer 25

P = V x I P - W V - V I - A

Question 26

What is the equation for power using current and resistance

Answer 26

P = V^2/R P - W V - V R - ohms

Question 27

Define transverse waves

Answer 27

Transverse waves vibrate at 90° to direction of travel

Question 28

Define longitudinal wave

Answer 28

Vibrate parallel to direction of travel

Question 29

Define displacement

Answer 29

How far a point on the wave has moved from its equilibrium position

Question 30

Define amplitude

Answer 30

The largest possible displacement from the equilibrium position

Question 31

Define wavelength

Answer 31

The length of one wave cycle

Question 32

Define period

Answer 32

The time taken for a while cycle to complete or pass a certain point

Question 33

What is the equation for frequency

Answer 33

f = 1/T f - Hz T - s

Question 34

What is the wave equation for speed, frequency and wavelength

Answer 34

v = f x wavelength v - ms^-1 f - Hz Wavelength - m

Question 35

What is the angle of incidence

Answer 35

The angle of the incoming wave

Question 36

What is the angle of reflection

Answer 36

The angle of the reflected wave

Question 37

What is the law of reflection?

Answer 37

Angle of incidence (i) = angle of reflection (r) I

Question 38

What happens when an EM wave enters a denser medium?

Answer 38

It bends towards the normal

Question 39

What happens when an EM enters a less dense medium

Answer 39

It bends away from the normal

Question 40

What is Snell’s Law?

Answer 40

When an incident ray travelling in air meets a boundary with another material, the angle of refraction of the ray, r, depends on the refractive index of the material and the angle of incidence, i. Refractive index (n) = sin i/ sin r

Question 41

What is the unit for EMF?

Answer 41

Volt, V

Question 42

Give an example of a transverse wave

Answer 42

Electromagnetic waves

Question 43

Give an example of a longitudinal wave

Answer 43

Sound waves

Question 44

What is the relative mass of a proton?

Answer 44

1

Question 45

What is the relative mass of a neutron

Answer 45

1

Question 46

What is the relative mass of an electron

Answer 46

0.0005

Question 47

What is the nucleon number?

Answer 47

Aka the mass number, total number of protons and neutrons

Question 48

What is the proton number?

Answer 48

Aka the atomic number, total number of protons in an atom

Question 49

What are isotopes?

Answer 49

Atoms with the same number of protons but a different number of neutrons

Question 50

What happens in alpha decay?

Answer 50

An alpha particle is emitted from the nucleus (made up of two protons and two neutrons) Proton number goes down by two, nucleon number down by 4

Question 51

What is beta decay?

Answer 51

A neutron in the nucleus turns into a protein and an electron. Electron is emitted from particle Proton number goes up by 1, nucleon number doesn’t change

Question 52

What is gamma decay?

Answer 52

High- energy electromagnetic radiation (gamma radiation) is emitted from nucleus Number of protons and neutrons stay the same

Question 53

What is the independent variable?

Answer 53

The thing you change in an experiment

Question 54

What is the dependant variable?

Answer 54

The thing you are measuring in an experiment

Question 55

What is a control variable?

Answer 55

Variables that must be kept the same to ensure it is a fair testament

Question 56

What is a positive correlation

Answer 56

As one variable increases, the other increases

Question 57

What is negative correlation

Answer 57

As one variable increases, the other decreases