Unit 2 - Chapter 6
- Created by: AnushaK
- Created on: 13-02-14 17:51
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- Ch 6
- Scalars and vectors
- Scalar - magnitude, no direction e.g. distance, time etc.
- Vectors - direction + magnitude e.g. displacement, velocity etc.
- - line of length proportional to magnitude - arrow to show direction
- In a straight line - add or subtract depending on direction
- Perpendicular vectors - use SOHCAHTOA to find RESULTANT
- AQA EXAMINER's TIP - use a large scale to reduce inaccuracy in measurement- use a sketch for calculations to ensure the right direction of the vectors
- Cross Winds act at 90^ to direction of movement
- Cross Currents act at 90^ to boating/ sailing
- AQA EX TIP - vectors cannot be mixed up, so displacement and forces should not on velocity diagrams
- Cross Winds act at 90^ to direction of movement
- Cross Currents act at 90^ to boating/ sailing
- AQA EX TIP - vectors cannot be mixed up, so displacement and forces should not on velocity diagrams
- AQA EX TIP - vectors cannot be mixed up, so displacement and forces should not on velocity diagrams
- Cross Currents act at 90^ to boating/ sailing
- Cross Winds act at 90^ to direction of movement
- AQA EX TIP - vectors cannot be mixed up, so displacement and forces should not on velocity diagrams
- Cross Currents act at 90^ to boating/ sailing
- Head winds and Tail winds
- Wind velocity will add to or subtract from athlete's velocity
- Air speed and ground speed - V_ground = V_air+V_wind
- Resolving Velocities - splitting a vector into x and y component
- Free-Body Diagrams - shows forces acting on only one object
- Rules : 1. only draw one body 2.do not mark forces +resultant 3. Label clearly, full name or symbols if defined 4. only the tension as pull on the diagram should be marked
- Forces on Free Body Diagram - Weight, Tension, Normal Reaction, Friction or drag, lift=object moves upward with aerodynamic forces, Upthrust = displacing gas or liquid, thrust.
- Scalars and vectors
- Lift - shape of aircraft's wing, top surface curved, air flow over top faster, so less pressure above wing = net upward force
- Wind velocity will add to or subtract from athlete's velocity
- Thrust - driving force by pull of propellor or push of jet engine. Jet engine forces exhaust backwards = push aircraft forward
- Drag - resistive force of air = slow aircraft down. Thrust = drag for aircraft flying at constant speed
- Weight = Mass x gravity
- Lift - shape of aircraft's wing, top surface curved, air flow over top faster, so less pressure above wing = net upward force
- Thrust - driving force by pull of propellor or push of jet engine. Jet engine forces exhaust backwards = push aircraft forward
- Drag - resistive force of air = slow aircraft down. Thrust = drag for aircraft flying at constant speed
- Thrust - driving force by pull of propellor or push of jet engine. Jet engine forces exhaust backwards = push aircraft forward
- Lift - shape of aircraft's wing, top surface curved, air flow over top faster, so less pressure above wing = net upward force
- Climbing + accelerating = lift > weight and thrust > drag. Resultant forces causes moving up and forward
- Forces can be resolved like velocities - Tcos@ overcomes horizontal friction and Tsin@ overcomes weight of object to make it move vertically
- Resolving Velocities - splitting a vector into x and y component
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