Physics
Important Equations To Remember
Density = Mass Divided By Volume Mass = Density Multiplied By Volume Volume - Mass Divided By Density
Pressure = Force Divided By Area Force = Pressure Multiplied By Area Area = Force Divided By Pressure
Speed = Distance Divided By Time
Distance = Speed Multiplied By Time Time = Distance Divided By Speed
Suvat Equations
S = Displacement (m) U = Initial Velocity (m/s) V = Final Velocity (m/s)
A = Acceleration (m/s²)
T = Time (s)
Displacement = (Initial Velocity + Final Velocity), Divided By 2 and Multiplied By Time
d = 0.5(u+v)t
Initial Velocity = Final Velocity - (Acceleration Multiplied By Time)
u = v - at
Final Velocity = (Acceleration Multiplied By Time) + Initial Velocity
v = at + u
Acceleration = (Final Velocity - Initial Velocity) Divided By 2
a = 0.5(v - u)
Time = (Final Velocity - Initial Velocity) Divided By Acceleration
t = (v - u) / a
2 Multiplied By Acceleration Multiplied By Displacement = Final Velocity Squared - Initial Velocity Squared
v² - u² = 2as
Acceleration Multiplied By Time
= Final Velocity - Initial Velocity
v - u = at
Speed-Time Graphs
Acceleration = (Final Velocity - Initial Velocity)
Divided By Time
Average Speed =
Distance Divided By Time
The Gradient Of A Speed-Time Graph Is The Acceleration
Gradient = Rise Divided Over Run
Unit = Metres Per Second Squared/Meters Per Second Per Second
Deceleration Means That The Object Is Slowing Down
It Usually Has A Negative Gradient
Unit = Metres Per Second Squared/Meters Per Second Per Second
The Distance Travelled In A Speed-Time Graph Is Calculated
From The Area Below A Speed-Time Graph
Terms That Needs To Be Known
Stationary Means That The Object Is NOT Moving
Horizontal Line In A Distance-Time Graph
Velocity = Displacement Divided By Time
A Line From The Bottom Left To The Top Right Means That It Is A Positive Gradient
The Steeper It Is, The Faster It Is
A Line From The Top Left To The Bottom Right Means That It Is A Negative Gradient
The Steeper It Is, The Fast It is
When An Object "Accelerates Uniformly", It Means That It Is Moving At A Constant Speed
Velocity Means How Fast An Object Moves In ONE Direction
Vector Quantity
Size And Direction
Speed Means How Fast An Object Moves In ANY Direction
Scalar Quantity
Size Only
(Final Velocity - Initial Velocity) Divided By Time
= Acceleration
a = (v - u) / t
(Final Velocity Squared - Initial Velocity Squared) Divided By
(Displacement Multiplied By 2) = Acceleration
a = (v² - u²) / 2s
Weight = Mass Multiplied By Gravitational Field Strength
Gravitational Field Strength = Weight Divided By Mass
Mass = Weight Divided By Gravitational Field Strength
Forces
Friction
Gravitational Force
Magnetic Force
Nuclear Force
Electromagnetic Force
Strong Force
Electrostatic Force
Upthrust
Elastic/Tension Force
Weak Force
Drag
Air Resistance
Forces Facts
Forces Are Vector Quantities
They Are Labelled Using Arrows
Gravitational, Magnetic And Electrostatic Forces Are Non-Contact Forces, Meaning That It Can Act On An Object Without Touching It
When Dragging An Object Across Rough Surfaces, More Force Is Needed. When Dragging An Object Across Smooth Surface, Not Much Force Is Needed.
Unbalanced Forces Are Forces That Causes An Object To Move In A Certain Direction
Balanced Forces Are (Usually) Two Forces Acting In Opposite Directions On An Object. They Are Equal In Size, Therefore, The Object Will Not Move
Normal Force