Name: __________________________ Date: _____________
| 1. |
A football is kicked at an angle ? with respect to the horizontal. Which one of the following statements best describes the acceleration of the football during this event if air resistance is neglected?
| A. |
The acceleration is zero m/s2 at all times. |
| B. |
The acceleration is 9.8 m/s2 at all times. |
| C. |
The acceleration is zero m/s2 when the football has reached the highest point in its trajectory. |
| D. |
The acceleration is positive as the football rises, and it is negative as the football falls. |
| E. |
The acceleration starts at 9.8 m/s2 and drops to some constant lower value as the ball approaches the ground. |
|
| 2. |
A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is necessarily true?
| A. |
The acceleration of the ball decreases as the ball moves upward. |
| B. |
The velocity of the ball is zero m/s when the ball is at the highest point in the arc. |
| C. |
The acceleration of the ball is zero m/s2 when the ball is at the highest point in the arc. |
| D. |
The x-component of the velocity of the ball is the same throughout the ball's flight. |
| E. |
The velocity of the ball is a maximum when the ball is at the highest point in the arc. |
|
| 3. |
A physics student standing on the edge of a cliff throws a stone vertically downward with an initial speed of 10.0 m/s. The instant before the stone hits the ground below, it is traveling at a speed of 30.0 m/s. If the physics student were to throw the rock horizontally outward from the cliff instead, with the same initial speed of 10.0 m/s, what is the magnitude of the velocity of the stone just before it hits the ground?
| E. |
The height of the cliff must be specified to answer this question. |
|
| 4. |
A tennis ball is thrown from ground level with velocity vo directed 30° above the horizontal. If it takes the ball 1.0 s to reach the top of its trajectory, what is the magnitude of the initial velocity?
|
A projectile is fired at an angle of 60.0° above the horizontal with an initial speed of 30.0 m/s.
Reference: Ref 3-3
| 5. |
What is the magnitude of the horizontal component of the projectile's displacement at the end of 2 s?
|
A projectile is fired at an angle of 60.0° above the horizontal with an initial speed of 30.0 m/s.
Reference: Ref 3-3
| 6. |
How long does it take the projectile to reach the highest point in its trajectory?
|
A projectile is fired from a gun and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively.
Reference: Ref 3-4
| 7. |
Determine the initial speed of the projectile.
|
A projectile is fired from a gun and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively.
Reference: Ref 3-4
| 8. |
At what angle is the projectile fired (measured with respect to the horizontal)?
|
A projectile is fired from a gun and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively.
Reference: Ref 3-4
| 9. |
Approximately how long does it take the projectile to reach the highest point in its trajectory?
|
A projectile is fired from a gun and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively.
Reference: Ref 3-4
| 10. |
What is the speed of the projectile when it is at the highest point in its trajectory?
|
A projectile is fired from a gun and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively.
Reference: Ref 3-4
| 11. |
What is the acceleration of the projectile when it reaches its maximum height?
| D. |
less than 9.8 m/s2 and non-zero. |
| E. |
Its magnitude is 9.8 m/s2; and its direction is changing. |
|
A projectile is fired from a gun and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively.
Reference: Ref 3-4
| 12. |
What is the magnitude of the projectile's velocity just before it strikes the ground?
|
| 13. |
A spring-loaded gun is aimed horizontally and is used to launch identical balls with different initial speeds. The gun is at a fixed position above the floor. The balls are fired one at a time.  If the speed of the second projectile fired is twice the speed of the first projectile fired, how is the horizontal range (denoted R in the figure) affected?
| A. |
The range for both projectiles will be the same. |
| B. |
The range of the second projectile will be half as much as that of the first projectile. |
| C. |
The range of the second projectile will be twice as large as that of the first projectile. |
| D. |
The range of the second projectile is about 1.4 times larger than that of the first projectile. |
| E. |
The range of the second projectile will be smaller than that of the first projectile by a factor of 1.4. |
|
| 14. |
A projectile is fired horizontally with an initial speed of 57 m/s. What are the horizontal and vertical components of its displacement 3.0 s after it is fired?
|
A shell is fired with a horizontal velocity in the positive
x direction from the top of an 80-m high cliff. The shell strikes the ground 1330 m from the base of the cliff.
Reference: Ref 3-5
| 15. |
Determine the initial speed of the shell.
|
A shell is fired with a horizontal velocity in the positive
x direction from the top of an 80-m high cliff. The shell strikes the ground 1330 m from the base of the cliff.
Reference: Ref 3-5
| 16. |
What is the speed of the shell as it hits the ground?
|
| 17. |
A cannonball is aimed 30.0° above the horizontal and is fired with an initial speed of 125 m/s at ground level. How far away from the cannon will the cannonball hit the ground?
|
| 18. |
A basketball is launched with an initial speed of 8.0 m/s and follows the trajectory shown. The ball enters the basket 0.96 s after it is launched. What are the distances x and y? Note: The drawing is not to scale.
|
| 19. |
A bullet is aimed at a target on the wall a distance L away from the firing position. Because of gravity, the bullet strikes the wall a distance ? y below the mark as suggested in the figure. Note: The drawing is not to scale.If the distance L were half as large, and the bullet had the same initial velocity, how would ? y be affected? 
| B. |
It will be half as large. |
| C. |
It will be four times larger. |
| D. |
It will be one fourth as large. |
| E. |
It is not possible to determine unless numerical values are given for the distances. |
|
A projectile is fired horizontally with an initial speed of 50.0 m/s. Neglect air resistance.
Reference: Ref 3-9
| 20. |
What is the magnitude of the displacement of the projectile 3.00 s after it is fired?
|
A projectile is fired horizontally with an initial speed of 50.0 m/s. Neglect air resistance.
Reference: Ref 3-9
| 21. |
What is the speed of the projectile 3.00 s after it is fired?
|
| 22. |
A basketball player is running at a constant speed of 2.5 m/s when he tosses a basketball upward with a speed of 6.0 m/s. How far does the player run before he catches the ball? Ignore air resistance.
| C. |
The ball cannot be caught because it will fall behind the player. |
|
| 23. |
A puck slides across a smooth, level tabletop at height H at a constant speed vo. It slides off the edge of the table and hits the floor a distance x away as shown in the figure.  What is the relationship between the distances x and H? |
| 24. |
An arrow is shot horizontally from a height of 4.9 m above the ground. The initial speed of the arrow is 45 m/s. Neglecting friction, how long will it take the arrow to hit the ground?
|
