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What is a projectile?
An object that is acted upon only by the force of gravity
What horizontal forces act on a object after it it thrown horizontally?
None
What vertical force acts on an object after it is thrown horizontally?
Weight
How is horizontal motion calculated for projectiles?
Using s = vt
How is vertical motion calculated for projectiles?
Using SUVAT equations
What component is the same for both vertical and horizontal motion?
Time
If an object is launched at an angle and returns to the ground what its the vertical displacement?
0
How do you start a calculation when an object is launched at an angle?
Resolve the initial speed into its horizontal and vertical components
How would air resistance effect the horizontal range and velocity?
They would decrease
How would air resistance effect vertical height?
It would decrease
As speed increases, what happens to air resistance?
It also increases
What happens to the acceleration of an object as its speed increases and why?
As the air resistance increases, the resultant forces decreases as thrust/weight remain constant, so the acceleration decreases
What is meant by terminal velocity?
When the resultant force acting on an object is 0, and it is moving at a constant velocity
How is resultant force calculated for vertical motion?
Weight - air resistance
How is resultant force calculated for horizontal motion?
Thrust - air resistance
State 3 factors effecting drag.
Shape
Fluid viscosity
Speed
How does the shape of an object effect its drag?
A more streamlined shape with have a lower drag
How does the viscosity of a fluid effect an object’s drag in it?
A thicker fluid will mean the object has a greater drag
How does the speed of an object effect its drag?
The greater the speed of an object, the greater its drag
