At the apex of the trajectory of a projectile, vertical velocity is at its maximum.
- true
- false
Answer: false
At the apex of the trajectory of a projectile, vertical velocity is at its maximum.
Answer: false
Showing posts with label Biomechanics Chapter 10. Show all posts
Showing posts with label Biomechanics Chapter 10. Show all posts
Answer: false
Toddlers exhibit more kinematic variability than adults during walking.
Toddlers exhibit more kinematic variability than adults during walking.
- true
- false
Answer: true
If air resistance is disregarded, the horizontal component of a projectile is constant.
If air resistance is disregarded, the horizontal component of a projectile is constant.
- true
- false
Answer: true
The vertical acceleration graph of a ball tossed into the air will follow a parabolic path.
The vertical acceleration graph of a ball tossed into the air will follow a parabolic path.
- true
- false
Answer: true
Although elite sprinters display improved kinematics over non-elite sprinters, elite 1500-m runners do not display distinguishable kinematic differences over other skilled runners.
Although elite sprinters display improved kinematics over non-elite sprinters, elite 1500-m runners do not display distinguishable kinematic differences over other skilled runners.
-true
-false
Answer: false
The form, pattern, or sequencing of movement with respect to time defines __________.
The form, pattern, or sequencing of movement with respect to time defines __________.
Answer: kinematics
In the absence of air resistance, the horizontal acceleration of a projectile is always equal to _________.
In the absence of air resistance, the horizontal acceleration of a projectile is always equal to _________.
Answer: 0
The highest point in the trajectory of a projectile is the ___________________.
The highest point in the trajectory of a projectile is the ___________________.
Answer: apex
A _________ is a body in free fall subject only to the forces of _______ and ____________.
A _________ is a body in free fall subject only to the forces of _______ and ____________.
Answer: projectile, gravity, air resistance
When acceleration is 0, velocity is _________.
When acceleration is 0, velocity is _________.
Answer: constant
In the formula v2 = v1, what is known about acceleration?
In the formula v2 = v1, what is known about acceleration?
A. acceleration = -9.81 m/s2
B. acceleration = 0
C. both A and B
D. need more information
Answer: B. acceleration = 0
The laws of constant acceleration can be applied to which of the following?
The laws of constant acceleration can be applied to which of the following?
A. horizontal component of projectile motion
B. vertical component of projectile motion
C. resultant of projectile motion
D. both A and B
E. all of the above
Answer: D. both A and B
Which of the following represents horizontal acceleration of a projectile?
Which of the following represents horizontal acceleration of a projectile?
A. -9.81 m/s2
B. -9.81 m/s
C. 0 m/s2
D. 0 m/s
Answer: C. 0 m/s2
Which of the following represents vertical acceleration of a projectile?
Which of the following represents vertical acceleration of a projectile?
A. -9.81 m/s2
B. -9.81 m/s
C. 0 m/s2
D. 0 m/s
Answer: A. -9.81 m/s2
Why do elite long jumpers have take-off angles far less than the optimal 45°?
Why do elite long jumpers have take-off angles far less than the optimal 45°?
A. take-off velocity is higher during lower take-off angles
B. relative take-off height is zero
C. both A and B
D. none of the above
Answer: A. take-off velocity is higher
The shape of a projectile's trajectory is influenced by which of the following?
The shape of a projectile's trajectory is influenced by which of the following?
A. angle of projection
B. air resistance
C. speed of projection
D. both A and B
E. all of the above
Answer: D. both A and B
Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity?
Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity?
A. remains constant throughout flight
B. changes according to gravitational acceleration
C. equal to 0
D. both A and B
Answer: A. remains constant throughout flight
Which of the following is/are true regarding the apex in the trajectory of a projectile?
Which of the following is/are true regarding the apex in the trajectory of a projectile?
A. it is the highest point in the flight
B. vertical velocity is 0
C. direction changes
D. both A and B
E. all of the above
Answer: E. all of the above
Which of the following components of projectile is affected by gravity?
Which of the following components of projectile is affected by gravity?
A. vertical component
B. horizontal component
C. both A and B
D. depends on the individual situation
Answer: A. vertical component
The negative sign in front of the acceleration due to gravity (-9.81 m/s2) can mean which of the following?
The negative sign in front of the acceleration due to gravity (-9.81 m/s2) can mean which of the following?
A. the projectile is traveling down and speeding up (negative direction)
B. the projectile is traveling up and slowing down (negative acceleration)
C. both A and B
D. none of the above
Answer: C. both A and B
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