


Useful Web Links 

2. Which of the following describe the vertical velocity of a projectile? List all that apply.
a. constant magnitude
b. changes by 10 m/s every second
c. initially directed in one direction and later in the opposite direction
d. the same at the beginning as at the end
e. is 0 m/s at the peak of the trajectory
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3. Which of the following describe the horizontal acceleration of a projectile? List all that apply.
a. 0 m/s/s
b. changing magnitude
c. has a magnitude of 10 m/s/s
d. initially directed in one direction and later in the opposite direction
e. none of the above are true
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4. Which of the following describe the vertical acceleration of a projectile? List all that apply.
a. has a magnitude of 10 m/s/s
b. changing magnitude
c. is always directed in the direction which the object moves
d.initially directed in one direction and later in the opposite direction
e. 0 m/s/s
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5. At the instant when a projectile reaches the peak of is trajectory, ____.
a. there are no forces acting upon the projectile
b. the acceleration of the projectile is 0 m/s/s
c. the vertical velocity is 0 m/s
d. the horizontal velocity is 0 m/s.
e. ...nonsense! None of these are true.
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For Questions #69: A 2.0kg projectile is launched at an angle to the horizontal. Initially, its horizontal velocity is 30 m/s and its vertical velocity is 20 m/s. Use this information to answer the following questions.
6. The projectile will be in the air for a time of approximately ____ seconds.
a. 1.5 
b. 2.0 
c. 3.0 
d. 3.3 

e. 4.0 
f. 5.0 
g. 6.0 
h. 10.0 
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7. At the peak of its trajectory, the net force acting upon the projectile is _____ N.
a. 0 N 
b. 10 N 
c. 20 N 
d. 30 N 

e. 40 N 
f. 50 N 
g. 60 N 
h. 100 N 
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8. The projectile will experience a horizontal displacement of _____ m.
a. 0 
b. 10 
c. 20 
d. 20 

e. 40 
f. 50 
g. 60 
h. 90 
i. 100 
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9. In the moments after its initial projection, the projectile has ______. Include all that apply.
a. a greater horizontal velocity than its vertical velocity
b. a greater horizontal acceleration than its vertical acceleration
c. a greater horizontal net force than its vertical net force
d. an upward velocity and a downward acceleration
e. an upward velocity and an upward acceleration
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10. On the diagrams below, draw arrows to represent the forces which act upon the football before it reaches the peak, at the peak, and after it reaches the peak. Assume the football is a "projectile" that is moving through the air from left to right. Label the force(s) according to type.
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11. A golf ball leaves the club with an initial velocity of 68.2 m/s at an angle of 22.4 degrees. Determine the horizontal and vertical velocity components (i.e., v_{ix} and v_{iy}). PSAYW
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12. Demonstrate your understanding of projectiles by filling in the following table for a projectile launched at an angle to the horizontal. (Note that the initial horizontal and vertical velocities are given.)








































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ProblemSolving:
13. A soccer ball is kicked horizontally off a 22.0meter high hill and lands a distance of 35.0 meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball. PSAYW
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14. A football is kicked with an initial velocity of 25 m/s at an angle of 45degrees with the horizontal. Determine (a) the total time of flight, (b) the horizontal distance, and (c) the peak height of the football. PSAYW
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Last updated on 11/2/00.