Lesson: Angled Projectile Motion

Topic Review:

Angled Projectile Motion

Recall...

• A projectile is a moving object upon which the only force acting is gravity.

  A force is not required to keep an object in motion.

• Gravity affects all projectiles equally!

Review: Horizontal Projectile Motion

• The X and Y axes are independent.

• A force is NOT required to keep an object in motion.

• Gravity is a vertical force, the only one that acts on a projectile.

• Projectiles follow a parabolic trajectory once launched

Multiple Choice

The more mass an object has, the faster it will fall.

• True

• False

Multiple Choice

Does vertical velocity change as a projectile rises and falls?

• yes 

• no

Multiple Choice

Two objects - one with mass m and the other with mass 2m - are released from rest at the same height. Which object hits the ground first?

• mass m

• mass 2m

• both objects hit the ground at the same time

• unable to determine with information given

Multiple Choice

What is the vertical acceleration of a projectile?

• 0 m/s² upwards

• 10 m/s² upwards

• 0 m/s² downwards

• 10 m/s² downwards

Multiple Choice

Does horizontal velocity change as a projectile rises and falls?

• yes

• no

Multiple Choice

What is the horizontal acceleration of a projectile?

• 0 m/s²

• 10 m/s²

Launch at an Angle

• Three types of Projectiles Dropped, Launched Horizontally, and Launched at an Angle.

• The object is projected up and horizontally at the same time.

• Gravity is the only thing acting on the projectile.

What affects Angled Projectile Motion?

• Angle of the Launch

• Launch Velocity

Angled Vector Components

• Two Dimensions: X (horizontal) and Y (vertical)

• We can "resolve" or split up an angle vector into pieces.

• Angle affects height and range.

Important notes!

• Vertical Acceleration = 10 m/s²

• Horizontal Acceleration = 0 m/s²

• Vertical velocity is 0 m/s at the peak of motion.

• Parabolas are symmetrical.

Multiple Choice

Once a projectile is launched, what is the only force that affects its motion?

• friction

• tension

• inertia

• gravity

Multiple Choice

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

Multiple Choice

Which of the following statements about the horizontal and vertical components of projectile motion is true?

• Changes in the horizontal component occur only when the vertical component changes.

• Both the horizontal and vertical components are always constant.

• The vertical component changes while the horizontal component stays the same.

• The horizontal component changes while the vertical component stays the same.

Multiple Choice

What is the direction of the acceleration for any projectile?

• The direction the projectile is traveling.

• Down

• Up

• Sideways

Multiple Choice

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Which of the following diagrams best shows the direction of the acceleration of the ball at point Q?

Multiple Choice

If a ball thrown straight up into the air takes 4 seconds to reach the top (peak), how long will it take to travel from the peak back to the original position?

• 0s

• 1s

• 3s

• 4s

Open Ended

How does the video clip justify that horizontal motion of a projectile is independent of its vertical motion?

Poll

How would you rate your confidence in Projectile Motion after the past two modules?

• I'm good! I understand it all so far and I'm ready to start calculating.

• I get most of it! There are still some things I need to review more.

• I'm neutral. I understand some, but there is some I still don't get yet.

• I'm kinda lost. I understand a bit but overall I'm more confused than confident.

• I'm totally lost! I do not understand anything so far.