Projectile Review

Quantity that has both magnitude and direction:

A. ScalarB. DirectrixC. PointerD. Vector

The horizontal and vertical parts of a diagonal vector.

A. ResultantsB. ComponentsC. CosecantsD. Hypotenuses

The path of a projectile is called its:

A. TrailB. TrajectoryC. RouteD. Projection

The trajectory of a launched projectile is a

A. Straight lineB. HyperbolaC. ParabolaD. Circular arc

Acceleration describes:

A. How fast something is moving

B. How fast something is moving and in what direction

C. How quickly the velocity is changing

D. How quickly the position is changing

If air resistance is negligible the acceleration of an object in free fall (on Earth) ______

A. Depends on how heavy it isB. Is 9.8 m/s2 upward if the

object is moving up and 9.8 m/s2 downward if the object is moving down.

C. Is 9.8 m/s2 down regardless of the direction the object is moving.

Speed a dropped object will be traveling 3 seconds later is most nearly:

A. 10 m/sB. 15 m/sC. 25 m/sD. 30 m/s

A ball is thrown straight up. At its highest point its velocity is ____ and its

acceleration is _____A. 0, 0B. 0, 10 m/s2 downC. 10 m/s, 0D. 10 m/s, 10 m/s2 up

If an object is thrown straight upward at 23 m/s what is its velocity 2.0 seconds later

A. About 10 m/s upB. About 10 m/s downC. About 3 m/s upD. About 3 m/s down

A ball thrown straight upward takes approximately 2 seconds to reach its highest

point. At what speed was it thrown?A. 5 m/sB. 10 m/sC. 20 m/sD. 30 m/sE. 40 m/s

A ball that is thrown straight up at 30 m/s reaches a maximum height of

1. 10 m2. 30 m3. 45 m4. 90 m

A ball is thrown straight upward at 20 m/s. It returns to where it was thrown in about:

A. 1.0 sB. 2.0 sC. 3.0 sD. 4.0 s

The horizontal acceleration of a projectile on earth.

A. +9.8 m/s2

B. -9.8 m/s2

C. 0.0 m/s2

D. -32 ft/s2

A projectile is launched horizontally from a cliff at 40 m/s. Three seconds later the horizontal component of its velocity is:

A. 10 m/sB. 30 m/sC. 40 m/sD. 50 m/s

A projectile is launched horizontally from a cliff at 40 m/s. Three seconds later the vertical

component of its velocity is about:A. 10 m/sB. 30 m/sC. 40 m/sD. 50 m/s

A projectile is launched horizontally from a cliff at 40 m/s. Three seconds later its speed is:

A. 10 m/sB. 30 m/sC. 40 m/sD. 50 m/s

A projectile is launched at 20 m/s at an angle of 30o above horizontal. The horizontal component of its initial velocity is:

A. 20 m/sB. 10 m/sC. 17.3 m/sD. 19.6 m/s

A projectile is launched at 20 m/s at an angle of 30o above horizontal. The vertical component of its initial velocity is:

A. 10 m/sB. 20 m/sC. 17.3 m/sD. 9.8 m/s

A projectile is launched at 20 m/s at an angle of 30o above horizontal. At its

highest point the total velocity is ____ and the acceleration is _____.

A. 20 m/s 9.8 m/s/s

B. 0.0 m/s 9.8 m/s/sC. 10 m/s 0 m/s/sD. 17.3 m/s 0 m/s/sE. 17.3 m/s 9.8 m/s/s

A projectile is launched at 20 m/s at an angle of 30o above horizontal. The amount of time it

remains airborne is about.A. 1.0 secondsB. 2.0 secondsC. 4.0 secondsD. 6.0 seconds

A projectile launched at 20 m/s at an angle of 30o lands on a level surface. How far

away does it land?A. 40 metersB. 20 metersC. 34 metersD. 9.8 metersE. 17 meters