# Lesson 2: Projectile Motion

20 Questions | Total Attempts: 1213  Settings  • 1.
• A.

True

• B.

False

• 2.
In the equations below, the vertical acceleration of a projectile is known to be 9.8m/s/s(the acceleration of gravity).
• A.

True

• B.

False

• 3.
An object upon which the only force acting is gravity.
• 4.
A cannonball is launched horizontally from the top of an 78.4-meter high cliff. How much time will it take for the ball to reach the ground and at what height will the ball be after each second of travel?
• 5.
Anna Litical drops a ball from rest from the top of 78.4-meter high cliff. How much time will it take for the ball to reach the ground and at what height will the ball be after each second of motion?
• 6.
Gravity acts to influence the vertical motion of the projectile, thus causing a vertical acceleration.
• A.

True

• B.

False

• 7.
An object dropped from rest is not a projectile (provided that the influence of air resistance is negligible).
• A.

True

• B.

False

• 8.
An object that is thrown vertically upward is also a projectile (provided that the influence of air resistance is negligible).
• A.

True

• B.

False

• 9.
An object which is thrown upward at an angle to the horizontal is also a projectile (provided that the influence of air resistance is negligible).
• A.

True

• B.

False

• 10.
A projectile is any object that once projected or dropped continues in motion by its own __________ and is influenced only by the downward force of __________ .
• A.

Inertia,Gravity

• B.

Mass,Frictional Force

• C.

Inertia,Frictional Force

• D.

None of the above.

• 11.
Horizontal forces are not required to keep a projectile moving horizontally.
• A.

True

• B.

False

• 12.
The horizontal velocity of a projectile can be changed.
• A.

True

• B.

False

• 13.
The horizontal motion of a projectile is independent of its vertical motion.
• A.

True

• B.

False

• 14.
Projectiles travel with a parabolic trajectory due to the influence of inertia.
• A.

True

• B.

False

• 15.
Y = 0.5 • g • t2  is equation for vertical displacement for a horizontally launched projectile
• A.

True

• B.

False

• 16.
The method of taking a single vector at an angle and separating it into two perpendicular parts. The two parts of a vector are known as components and describe the influence of that vector in a single direction.
• 17.
The initial x-velocity (vix) can be found using the equation vix = vi•cosine(Theta) where Theta is the angle that the velocity vector makes with the horizontal.
• A.

True

• B.

False

• 18.
The initial y-velocity (viy) can be found using the equation viy = vi•sine(Theta) where Theta is the angle that the velocity vector makes with the horizontal.
• A.

True

• B.

False

• 19.
If the horizontal velocity of a projectile is constant; there is no horizontal acceleration.
• A.

True

• B.

False

• 20.
The horizontal displacement of a projectile is dependent upon the horizontal component of the initial velocity.
• A.

True

• B.

False

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