Projectile Motion Quiz 1

3 marbles are placed on a tabletop. The first has a mass of 1 kg and an initial horizontal velocity of 2 m/s, the second has a mass of 1 kg and an initial horizontal velocity of 4 m/s, and the third has a mass of 2 kg and an initial horizontal velocity of 4 m/s. Assume the table is frictionless and the marbles have the same shape.

1. If all three marbles are rolled off the table with their given initial velocities,

which will have the greatest horizontal range (x)?

1. Marble 1
2. Marble 2
3. Marble 3
4. Marble 1 and Marble 2 have the same range
5. Marble 2 and Marble 3 have the same range

Explain:

A ball is kicked horizontally from the top of a 12-meter tall roof with a horizontal velocity of 5 m/s.

1. How long does it take for it to reach the ground?

Diagram	Given(s)	Unknown(s)	Equation(s)	Substitution	Solution

1. How far horizontally from the base of the roof does the ball hit the ground?

Given(s)	Unknown(s)	Equation(s)	Substitution	Solution

Vocabulary (Fill in the blanks)

Fluid Resistance, Range, Height, Projectile, Parabolic Motion

1. ____________________________________: The vertical distance a projectile travels

1. ____________________________________: Friction acting opposite to the relative motion of any object moving with respect to a surrounding fluid (such as air or water).

1. ____________________________________: The curved path of projectiles with both a horizontal and vertical velocity component.

1. ____________________________________: Any object that moves through air or space and is acted on by gravity (and air resistance, if any).

1. ____________________________________: The horizontal distance a projectile travels

Bonus Problem

Before the invention of laser-guided bombs, pilots had to release their payload prior to flying over a target.

1. If a plane is flying at a height of 650 meters and releases a package, how long will it take the package to hit the ground?

Diagram	Given(s)	Unknown(s)	Equation(s)	Substitution	Solution

1. If the package lands 500 m away from the initial dropping point, what was the horizontal velocity of the plane when it released the package?

Given(s)	Unknown(s)	Equation(s)	Substitution	Solution