# Chapter 3 Projectile Motion Notes - PowerPoint PPT Presentation

1 / 11
Title:

## Chapter 3 Projectile Motion Notes

Description:

### e.g. throwing a baseball, cannon, ball rolling off table. 2 independent 'components' of motion: ... Projectiles: stone thrown in air, cannon ball, etc. ... – PowerPoint PPT presentation

Number of Views:491
Avg rating:3.0/5.0
Slides: 12
Provided by: matthe170
Category:
Tags:
Transcript and Presenter's Notes

Title: Chapter 3 Projectile Motion Notes

1
Chapter 3 Projectile Motion Notes
2
Introduction
• Nonlinear Motion- Motion along a curved path.
e.g. throwing a baseball, cannon, ball rolling
off table.
• 2 independent components of motion
• Horizontal remains constant w/o a force acting
on it.
• Vertical changes w/ time, g pulls object ? at
10m/s/s.
• ? Combined effects produce a curved path,
however, neither component affects the other.
• Vectors (arrows) help us understand this motion.

3
3.1 Vector and Scalar Quantities
• Vector quantity A quantity that requires both
magnitude direction.
• e.g. velocity, acceleration
• Scalar quantity A quantity that is described by
magnitude only. Can be added, subtracted,
multiplied divided.
• e.g. mass, volume time
• Arrows are used to represent vector quantities.
• length of arrow magnitude
• direction of arrow direction of vector
quantity

4
(No Transcript)
5
3.2 Velocity Vectors
• Follow on the Board
• Suppose an airplane is flying north at 100km/h
and there is a tailwind blowing north at a
velocity of 20km/h.
• Suppose the same airplane turns around and flies
into the wind.
• Suppose an airplane flying north at 80km/h caught
a strong crosswind of 60km/h blowing west to east.

6
3.2 Continued
• Resultant the result of adding two vectors.
• How do you find the resultant?
• Vectors at right angles
• Draw 2 vectors with tails touching
• Draw parallel projection of each vector with
dashed lines
• Draw the diagonal (from point where tails are
touching)
• Vectors not at right angles
• Form a parallelogram, the resultant is its
diagonal.
• Note To add 2 vectors that are equal in
magnitude at right angles, we use a square.
The diagonal is the square root of 2 or 1.414
times the length of one of its sides.

7
3.3 Components of Vectors
• Any vector can be broken down into its vertical
and horizontal vectors, called components.
• Resolution process of determining the components
of a vector. (p. 32, Figure 3.7)
• Vertical and Horizontal lines are drawn from the
tail of the vector.
• A rectangle is drawn that encloses the vector as
its diagonal.
• Sides of the rectangle are the desired components.

8
3.4 Projectile Motion
• Projectiles stone thrown in air, cannon ball,
etc.
• Projectile Motion
• ?Horizontal velocity remains constant when no
horizontal force acts on projectile.
• ? Vertical velocity changes dues to gravity.
• Combined affect produces curved path, parabola.

9
3.5 Upwardly Launched Projectiles
• No gravity projectile follows straight-line
path.
• With gravity projectile falls beneath line,
same vertical distance it would fall from rest.
• d ½ gt2 or d 5t2

10
3.5 Continued
• Figure 3.11, p.36
• Horizontal component is always the same
• Vertical component changes
• Resultant diagonal of rectangle formed
• Figure 3.12, p.36
• Initial velocity is greater due to increase in
angle higher path
• Figure 3.13, p.36
• Paths of projectiles with same initial speed but
different projection angles.
• Projectiles reach different height horizontal
distances.
• Distance is the same for projectiles launched at
angles that add up to 90 degrees.
• Maximum range or distance is obtained at 45
degree angle
• If air resistance is small, it will take the same
amount of time for projectile to reach its max
height as it does to fall
• For short range projectiles, assume ground is
flat.
• Long range projectiles, account for earths
curvature.

11
3.6 Fast-Moving Projectiles-Satellites
• Earth Satellite a projectile traveling fast
enough to fall around the earth rather than into
it.
• ? This speed is 8 km/s or 18,000 mi/h
• Satellites orbit above earths atmosphere in
order to avoid air drag and burning up.
• ?Cant avoid gravity!