Worksheetsphy_2.7_momentum 動量 2
Total questions: 5
Worksheet time: 1hrs 15mins
A ball of mass 200 g travels horizontally towards a wall at a speed of 10 m s−1. After rebounding from the wall, the ball travels at a speed of 8 m s−1 in the opposite direction. Suppose the collision time is 0.1 s. Find the average force applied to the ball by the wall.
一個質量為200 g的小球正以10 m s−1的速率沿水平方向撞向牆壁。其後，小球以8 m s−1的速率朝相反方向回彈。假設碰撞時間為0.1 s，試求牆壁作用於小球的平均力。
0.4 N
3.6 N
4 N
36 N
At the moment the baseball player catches the ball, he moves his hands towards himself. This can reduce
在棒球運動中，捕手在接球後會把手移向自己。這樣做能夠減少
the impulse of the ball.
棒球的衝量。
the time to stop the ball.
停下棒球所需的時間。
the force required to stop the ball.
停下棒球所需的力。
the work done to stop the ball.
停下棒球所作的功。
Two identical blocks of the same mass travel at velocities of v and 2v on a smooth surface as shown. What is the total momentum of the two blocks after collision?
如圖所示，兩個質量與大小形狀都相同的方塊分別以 v 和 2v 的速度在一個平滑的表面上移動。兩個方塊在碰撞後的總動量是多少？
0
2mv
3mv
Cannot be determined
無法計算
Two identical blocks of the same mass travel at velocities of v and 2v on a smooth surface as shown. If the blocks move together after collision, what is their common velocity?
如圖所示，兩個質量與大小形狀都相同的方塊分別以 v 和 2v
的速度在一平滑的平面上移動。假如它們在碰撞後靠在一起移動，它們的共同速度是多少？
v
23v
2v
3v
In a car accident, an air bag is designed to
在汽車交通意外中，安全氣袋的作用是
reduce the change in momentum of the passenger.
減少乘客的動量變化。
slow down the passenger in a longer time.
使乘客在較長時間內減速。
shorten the collision time.
減少碰撞時間。
increase the stopping distance of the passenger.
增加乘客的停止距離。
