projectile motion

The initial horizontal velocity of a projectile is ____ its final horizontal velocity.

• less than

• equal to

• greater than

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

• mass

• friction

• inertia

• gravity

What is the horizontal acceleration of a projectile?

• 0 m/s²
• 9.8 m/s²

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

What is the direction of the acceleration for any projectile?

• The direction the projectile is traveling.

• Down

• Up

• Sideways

In the picture, cannonball A was launched at 10 m/s at 60°, and B was launched at 18 m/s at 25°. The cannonball that hit the ground first was

• A, because it had less total velocity.

• B, because it had more total velocity.

• A, because it had less initial vertical velocity.

• B, because it had less initial vertical velocity.

An object is shot from the ground (at 25 m/s) at 25 degrees and 65 degrees.  Which one rises to a higher height? (assume no air resistance)

• 25 degrees
• 65 degrees
• same for both

Two objects of the same mass are launched from the ground. Object A has a launch angle of 45, while Object B has a launch angle of 65. Which object has the greatest maximum height height?

• A
• B
• Both objects reach the maximum height
• unable to determine with the given information

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points

A ball is thrown into the air at some angle, with initial velocities v_x (horizontal) and v_y (vertical). At the very top of the ball’s path:

What is its velocity in the horizontal direction?

• v_x

• Greater than v_x

• Zero