Motions Flashcards
(18 cards)
Define LINEAR MOTION
Change in position of an object in a straight line
Define ACCELERATION. What is the EQUATION?
- Rate of change of velocity
- A= (Final vel. - Initial vel.)
/
(Time taken)
What is the EQUATION for VELOCITY?
V= Displacement / Time taken
Define ANGULAR MOTION
Motion of a mass about a fixed point/ axis
Define ANGULAR MOMENTUM. What is the EQUATION?
- Product of velocity and moment of inertia
- AM= MoI X Angular velocity
Define MOMENT OF INERTIA
Amount of force required to move a mass in a straight line
What is the RELATIONSHIP between ANGULAR VELOCITY and MOMENT OF INERTIA?
If MoI increases then AV decreases and vice versa
Define PROJECTILE MOTION
Movement of an object through air
What are the FORCES acting on PROJECTILE MOTION?
- Gravity
- Air resistance
- Lift
Define PARABOLA
Curved path an object follows during movement in air
How does the MASS OF AN OBJECT effect its PARABOLA?
- Increased mass= more parabolic flight
- Decreased mass with external forces= non parabolic flight
Describe how the ANGLE OF RELEASE should be ADJUSTED
Lower than 45oc: When release height>Landing height
45oc: When release height=Landing height
Higher than 45oc: When Landing height>Release height
Define AERODYNAMICS
- Flow of air around a projectile
- Which influences the speed and direction of travel
What FACTORS affect AERODYNAMICS?
- Velocity
- Shape
- Cross sectional area (frontal)
- Smoothness of surface
Define HYDRODYNAMICS
- Flow of water around a projectile
- Which can influence speed and direction of travel
How can SWIMMERS MINIMISE DRAG of HYDRODYNAMICS?
- Streamline body
- Lean body
- Tight fitting suits
- Swimming hats
- Remove hair
- Maximise 15m start of swim
What does BERNOULLI’S EFFECT STATE?
- As velocity of a fluid increases
- Pressure exerted by fluid decreases
What causes LIFT FORCES and SPIN FORCES?
Differences in pressure due to differences in velocities of air
