Which of the following statements is true regarding objects projected from the same level as they land?
A. time up and time down are equal
B. angle of decent is equal to angle of takeoff
C. both A and B
D. all of the above
Answer: C. both A and B
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Biomechanics Chapter 10
- At the apex of the trajectory of a projectile, vertical velocity is at its maximum.
- Toddlers exhibit more kinematic variability than adults during walking.
- If air resistance is disregarded, the horizontal component of a projectile is constant.
- The vertical acceleration graph of a ball tossed into the air will follow a parabolic path.
- Although elite sprinters display improved kinematics over non-elite sprinters, elite 1500-m runners do not display distinguishable kinematic differences over other skilled runners.
- The form, pattern, or sequencing of movement with respect to time defines __________.
- In the absence of air resistance, the horizontal acceleration of a projectile is always equal to _________.
- The highest point in the trajectory of a projectile is the ___________________.
- A _________ is a body in free fall subject only to the forces of _______ and ____________.
- When acceleration is 0, velocity is _________.
- In the formula v2 = v1, what is known about acceleration?
- The laws of constant acceleration can be applied to which of the following?
- Which of the following represents horizontal acceleration of a projectile?
- Which of the following represents vertical acceleration of a projectile?
- Why do elite long jumpers have take-off angles far less than the optimal 45°?
- The shape of a projectile's trajectory is influenced by which of the following?
- Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity?
- Which of the following is/are true regarding the apex in the trajectory of a projectile?
- Which of the following components of projectile is affected by gravity?
- The negative sign in front of the acceleration due to gravity (-9.81 m/s2) can mean which of the following?
- What quantity is calculated as the inverse of speed?
- Why does running downhill tend to increase running speed?
- What factor(s) distinguishes elite cross-country skiers from non-elite performers?
- The meter is the unit of measurement for which of the following?
- Which of the following is/are used to indicate direction of displacement?