画出以下情况的受力示意图： 1. 静止在水平桌面上的茶壶。 2. 用绳子悬挂并靠在墙上的小球（静止状态）。 3. 在水平传送带上匀速移动的物体。 4. 静止的小球。 画出以下情况的受力示意图： 1. 静止在水平桌面上的茶壶。 2. 用绳子悬挂并靠在墙上的小球（静止状态）。 3. 在水平传送带上匀速移动的物体。 4. 静止的小球。 Read more

Steps to Solve

1. Tea Pot on Table: Identify forces

Since the tea pot is resting on the table, it is being acted upon by gravity downwards ($G$) and the normal force upwards ($N$) from the table. Since the tea pot is at rest, the forces must be balanced.

2. Draw force diagram for tea pot

Draw a downward arrow representing gravity ($G$) and an upward arrow of equal length representing the normal force ($N$). Both arrows originate from the center of mass.

3. Small ball on a string against the wall: Identify forces

The small ball is acted upon by gravity downwards ($G$), tension from the string upwards and to the left ($T$) and normal force from the wall horizontally to the right ($N$).

4. Draw force diagram for small ball

From the center of mass, draw a downward arrow $G$, an arrow pointing up and to the left for $T$, and an arrow pointing to the right for $N$.

5. Object on conveyor belt: Identify forces

The object on the horizontal conveyor belt, moving at a constant speed, is acted upon by gravity downwards ($G$) and the normal force upwards ($N$). Since the object moves at constant speed, there are no other forces, like friction, acting upon it.

6. Draw force diagram for object on conveyor belt

Draw an arrow pointing downwards from the center of mass representing $G$, and an arrow pointing upwards with equal length representing $N$.

7. Small ball on inclined plane: Identify forces

The small ball on the inclined plane experiences gravity, $G$ downwards, and a normal force $N$ perpendicular to the surface of the inclined plane.

8. Draw force diagram for small ball on inclined plane

From the center of mass, draw a downward arrow labeled $G$ and an arrow pointing up and to the left, perpendicular to the inclined plane, labeled $N$.