1. Put the object into the slide
To make this courseware, you need to put two steel balls and planes into the slide. These figures can be drawn by yourself or from the "Physical Artboard". The key is to adjust the position of the steel ball and the plane, which can reflect the effect of the steel ball moving in the plane. The relative position between the steel balls can be modified later based on the animation effect.
2. Define the action path of the steel ball
The steel balls in this courseware need to move in opposite directions, and each of them moves in the opposite direction after the collision. To set the motion path for the left ball, select the "steel ball" to the left of the plane, open the "Add Effect / Action Path / Draw Custom Path" submenu in the "Custom Animation" task pane, and then click "Curve" command. Move the cross-shaped cursor over the "steel ball" and press the left mouse button to move to the right to draw the trajectory before the steel ball collides. When the length of the line reaches the midpoint of the two steel balls, first release the mouse and click to leave a vertex between the two steel balls. Then press the left mouse button to move to the right to draw the motion track after the collision of the steel ball. When the cursor reaches the position of the steel ball and double-clicks the mouse to end, you can see the effect of the steel ball moving to the right and then to the left.
Repeat the above operation to set the motion path for the right steel ball.
3. Define animation time
Since the teaching requires two steel balls to move toward each other at the same time, it is necessary to set their movements at the same time. The specific operation method is: select the steel ball on the right side of the horizontal plane, and its name in the “Custom Animation” task pane will be Checked. Click the drop-down button to the right of the name to open the menu, select the "Start from the previous item", you can achieve the effect of the simultaneous movement of the steel balls on the left and right sides.
If the apex position of the ball trajectory is not very accurate, then it may happen that the steel ball has not been touched and separated. At this time, you can select any one of the steel balls, and reduce or increase the distance between the two steel balls as needed.
If you need to increase or decrease the speed of the ball before and after the collision, you can double-click the ball movement track in the slide to open the "Timer" option of the "Custom Path" dialog box, and set the appropriate method as described above. Movement speed and number of repetitions.