1. Motion → Change in position.
运动→改变位置
2. Kinematics → Mathematical description of motion
运动学→运动的数学描述
3. Scalar → Magnitude or size only
纯量→大小或尺寸唯一
4. Vector → Magnitude and direction
向量→大小和方向
5. Vector Addition → Head to tail(tip to tail)
向量加法→头部到尾部(尖到尾巴)
6. Resultant → Sum of 2 vectors(tail of 1st to head of 2nd )
结果→2个向量的总和(尾1日至第2头
7. Distance → Length moved(scalar)
距离→长度移动(纯量)
8. Displacement → Length + direction of position change(from starting pt)
(A vector quantity)
位移→长度+方向的位置变化(从出发点)(向量)
9. Speed → Distance per unit time(scalar)
速度→每单位时间的距离(纯量)
10. Instantaneous speed → speed at a given instant
瞬时速度→在某一时刻的的速度
11. Instantaneous velocity → Instantaneous speed plus direction
瞬时速度→瞬时速度正方向
12. (v)=Average speed → Distance travelled / time interval
平均速度→移动的距离/时间间隔
13. Constant speed → Same speed(rate)throughout time interval(for constant
speed,instantaneous speed = Average speed)
恒定速度→相同的速度(速率)在整个时间间隔
(恒定的速度,瞬时速度=平均速度)
14. Constant velocity means zero acceleration (no speed change)
恒定的速度意味着零加速(无速度的变化)
15. Acceleration=Rate of change of velocity(change in velocity / time interval of change) Position acceleration (when an object speeds up) → increasing speed
加速度=速率的变化的速度(速度/时间间隔的变化的变化)
位置加速度(当一个物体加速)→增长速度
16. Uniform acceleration = Constant acceleration → Same rate of change (increase or
decrease)of speed throughout time interval
匀加速度=常数加速度→相同的变化率(增加或减少) 的速度在时间间隔
17. Deceleration=Negative acceleration (decrease in speed)
(whenever an object slows down)
减速度=负的加速度(减速度)
(当一个对象减慢)
18. Average velocity of uniformly accelerating object = Middle velocity
(middle velocity is half way between initial + final velocities)
平均速度的均匀加速对象=中间速度
(中间速度是中途之间初始+最终速度)
19, Acceleration due to gravity → Same for all falling bodies,g=-9.8/m/s2 (Neg.acceleration or Neg.velocity → towards earth)
重力加速度由于重力的所有物体坠落→同样下降,G=-9.8/米/秒2(加速度和速度→推向地球)
19. symmetry applies for objects shot straight up:a=g
Time up = time down,velocity hitting ground =velocity initially shot 对称申请对象直接拍摄
时间到=时间下来, 速度撞击地面=速度最初拍摄
1. Motion → Change in position.
运动→改变位置
2. Kinematics → Mathematical description of motion
运动学→运动的数学描述
3. Scalar → Magnitude or size only
纯量→大小或尺寸唯一
4. Vector → Magnitude and direction
向量→大小和方向
5. Vector Addition → Head to tail(tip to tail)
向量加法→头部到尾部(尖到尾巴)
6. Resultant → Sum of 2 vectors(tail of 1st to head of 2nd )
结果→2个向量的总和(尾1日至第2头
7. Distance → Length moved(scalar)
距离→长度移动(纯量)
8. Displacement → Length + direction of position change(from starting pt)
(A vector quantity)
位移→长度+方向的位置变化(从出发点)(向量)
9. Speed → Distance per unit time(scalar)
速度→每单位时间的距离(纯量)
10. Instantaneous speed → speed at a given instant
瞬时速度→在某一时刻的的速度
11. Instantaneous velocity → Instantaneous speed plus direction
瞬时速度→瞬时速度正方向
12. (v)=Average speed → Distance travelled / time interval
平均速度→移动的距离/时间间隔
13. Constant speed → Same speed(rate)throughout time interval(for constant
speed,instantaneous speed = Average speed)
恒定速度→相同的速度(速率)在整个时间间隔
(恒定的速度,瞬时速度=平均速度)
14. Constant velocity means zero acceleration (no speed change)
恒定的速度意味着零加速(无速度的变化)
15. Acceleration=Rate of change of velocity(change in velocity / time interval of change) Position acceleration (when an object speeds up) → increasing speed
加速度=速率的变化的速度(速度/时间间隔的变化的变化)
位置加速度(当一个物体加速)→增长速度
16. Uniform acceleration = Constant acceleration → Same rate of change (increase or
decrease)of speed throughout time interval
匀加速度=常数加速度→相同的变化率(增加或减少) 的速度在时间间隔
17. Deceleration=Negative acceleration (decrease in speed)
(whenever an object slows down)
减速度=负的加速度(减速度)
(当一个对象减慢)
18. Average velocity of uniformly accelerating object = Middle velocity
(middle velocity is half way between initial + final velocities)
平均速度的均匀加速对象=中间速度
(中间速度是中途之间初始+最终速度)
19, Acceleration due to gravity → Same for all falling bodies,g=-9.8/m/s2 (Neg.acceleration or Neg.velocity → towards earth)
重力加速度由于重力的所有物体坠落→同样下降,G=-9.8/米/秒2(加速度和速度→推向地球)
19. symmetry applies for objects shot straight up:a=g
Time up = time down,velocity hitting ground =velocity initially shot 对称申请对象直接拍摄
时间到=时间下来, 速度撞击地面=速度最初拍摄