Projectile Motion

Question 1

What is Projectile Motion?

Answer 1

An object in motion which is only affected by gravity.
The path it takes = trajectory.

Question 2

Components of 2D Motion

Answer 2

VERTICAL
^- affected by gravity. The forces are unbalanced from this downwards push.

HORIZONTAL
^- Constant (when AR is neglected)

Question 3

1. “Time in air”
2. “Max height”
3. “Range”
4. “Velocity after x seconds”

Answer 3

1. Vertical component
2. Vertical component
3. Horizontal component
4. Vertical component CHANGES

Question 4

Explain Launch angle

Answer 4

The angle at which an object is launched at which results in a max/optimised RANGE: 𝜃=45°

A SMALL angle = ↑ Horizon. comp., but the Time is ↓

To compensate for the decreased time in air, the angle can’t be too small.

Question 5

What is Air Resistance?
(+ what is drag then?)

Answer 5

AR is a type of FRICTION which acts AGAINST the motion of the object.

Drag is the FORCE which is opposite to the thrust or forwards force.

Question 6

What are factors that influence the drag force?

Answer 6

1. Speed
2. Cross-sectional Area (SA)
3. Density

Question 7

Terminal Velocity

Answer 7

• The DRAG force which results in ZERO NET FORCE

The forces become = and opp. to the drag force, therefore balanced and the velocity becomes constant.