# P4 - Explaining Motion

Mind Map by Matthew Jones, updated more than 1 year ago
 Created by Matthew Jones over 6 years ago
339
7

### Description

Physics (P4) Mind Map on P4 - Explaining Motion, created by Matthew Jones on 09/30/2013.

## Resource summary

P4 - Explaining Motion
1 Speed
1.1 Speed (m/s) = Distance Traveled (m) / Time Taken (s)
1.2 Distance (m) = Speed (m/s) X Time Taken (s)
1.3 Time (s) = Distance (m) / Speed (m/s)
2 Distance-Time Graphs
2.2 Flat sections are where it's stationary
2.3 The steeper the gradient, the faster it is going
2.4 Straight lines meaning the object is moving at a constant speed
2.5 A steeping curve = Acceleration
2.6 A leveling off curve = Deceleration
2.7 Speed = Gradient = Vertical / Horizontal
3 Displacement-Time Graphs
3.1 Displacement can be Positive or Negative
3.2 They show is two different objects travelling different directions from a point
4 Acceleration
4.1 Acceleration (m/s~2) = Change in Velocity (m/s) / Time Taken (s)
4.2 Change in Velocity (m/s) = Acceleration (m/s~2) X Time Taken (s)
4.3 Time Taken (s) = Change in Velocity (m/s) / Acceleration (m/s~2)
5 Velocity-Time Graphs
5.2 Flat sections = Constant Speed
5.3 The steeper the gradient, the greater the acceleration or deceleration
5.4 Uphill sections are acceleration
5.5 Downhill sections are deceleration
5.6 Negative Velocity means the object is travelling in the opposite direction
6 Forces and Friction
6.1 Forces occur when two object interact
6.2 An object resting on a surface experiences a reaction force
6.3 Moving objects normally experience friction
6.4 Three types of Friction
6.4.1 Friction between solid surfaces which are gripping
6.4.2 Friction between solid surfaces which are sliding past each other
6.4.2.1 Can be reduced by adding a lubricant
6.4.3 Resistance or "Drag" from fluids
7 Acceleration
7.1 When a car exerts a bigger driving force than the drag counter force, the car will then accelerate.
7.2 The bigger the force, the greater the acceleration
8 Momentum
8.1 Momentum (kg m/s) = Mass (kg) X Velocity (m/s)
8.2 Velocity (m/s) = Momentum (kg m/s) / Mass (kg)
8.3 Mass (kg) = Momentum (kg m/s) / Velocity (m/s)
9 Change of Momentum
9.1 Change of Momentum (kg m/s) = Resultant Force (N) x Time for which the force acts (s)
9.2 Resultant Force (N) = Change of Momentum (kg m/s) / Time for which the force acts (s)
9.3 Time for which the force acts (s) = Change of Momentum (kg m/s) / Resultant Force (N)
10 Car Safety Features Reduce Forces
10.1 Crumple Zones
10.1.1 Increases the time taken for the car to stop
10.2 Air Bags
10.2.1 Slows the passenger more gradually
10.3 Seat Belts
10.3.1 Increases the time taken for the wearer to stop (reduces the forces acting on the chest)
10.4 Helmets
10.4.1 Increases the time taken for your head to come to a stop if it hits something hard
11 Work
11.1 When a force moves an object, it does work and energy is transferred to the object
11.2 Amount of energy transferred (J) = Work Done (J)
12 Work done by a force
12.1 Work done by a force (J) = Force (N) x Distance moved in direction of force (m)
12.2 Force (J) = Work done by a force (J) / Distance moved in direction of force (m)
12.3 Distance moved in direction of force (m) = Work done by a force (J) / Force (N)
13 Kinetic Energy
13.1 Kinetic Energy (J) = 1/2 x Mass (kg) x Velocity~2 ([m/s]~2)
13.2 Mass (kg) = 1/2 x Kinetic Energy (J) / Velocity~2 ([m/s]~2)
13.3 Velocity~2 ([m/s]~2) = 1/2 x Kinetic Energy (J) / Mass (kg)
14 GPE
14.1 Change in GPE
14.1.1 Change in GPE (J) = Weight (N) x Vertical Height Difference (m)
14.1.2 Weight (N) = Change in GPE (J) / Vertical Height Difference (m)
14.1.3 Vertical Height Difference (m) = Change in GPE (J) / Weight (N)
14.2 Kinetic Energy Gained - GPE Lost

### Similar

OCR Physics P4 Revision
Waves
Forces and their effects
Forces and motion
Using GoConqr to study science
AQA Physics P1 Quiz
GCSE AQA Physics - Unit 3
GCSE AQA Physics 1 Energy & Efficiency
Junior Cert Physics formulas