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| Experimental components |
Plastic car, scaled wooden board, plastic bucket, thin wire |
| Experimental process |
(1) As shown in Figure A, install the experimental equipment on a horizontal and smooth table, and keep the two cars side by side and still. Hang weights of the same mass on the left side of the left car and the right side of the right car respectively. And the thin ropes on both sides are kept in the same straight line. After releasing your hand, observe whether the movement state of the car changes. (2) As shown in Figure B, keep the car still, hang weights of the same mass on both sides of the rope, and observe whether the movement state of the car changes. (3) As shown in Figure B, keep the car still, hang weights of different masses on both sides of the rope, and observe whether the movement state of the car changes. (4) On the basis of Figure B, rotate the car at a certain angle on a horizontal plane and release the weight to observe the movement state of the car. (5) Hang both weights on one side of the car. After releasing the weight, observe the movement state of the car. |
| Experimental phenomena |
In experiment (1), the two cars move in opposite directions and cannot remain stationary. In experiment (2), the car still remains stationary. The size of the resultant force on the car is 0, and the analysis of forces is shown in Figure D. In experiment (3), the car moves in the direction where there is a larger mass weight. At this time, the direction of resultant force on the car is same as that where there is a larger mass weight. The analysis of forces is shown in Figure E. In experiment (4), when releasing weight, car rotates until ropes on both sides are in same straight line and then it remains stationary. The analysis of forces is shown in Figure F. In experiment (5), after releasing weight, car accelerates in direction where weight is located. |
| Experimental conclusion | When two forces acting on same object are equal in magnitude but opposite in direction and are on same straight line, these two forces meet condition for balance of two forces. |
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