Two bodies must interact with each other in order to be able to exert a .........on one another.

Options

A. force
B. pressure
C. speed
D. collision

Answer

To solve the question, "Two bodies must interact with each other in order to be able to exert a ......... on one another," we can follow these steps:

### Step 1: Understand the Interaction
Two bodies can interact in various ways, such as pulling, pushing, or coming into contact with each other. This interaction is crucial for any physical effect to occur between them.

**Hint:** Think about how two objects can influence each other when they come into contact or are in proximity.

### Step 2: Identify the Nature of the Interaction
When two bodies interact, they can exert different types of effects. The most relevant effects in physics are force, pressure, speed, and collision. However, we need to identify which of these is directly related to the interaction between the two bodies.

**Hint:** Consider what happens when two objects are in contact or influence each other. What do they exert on each other?

### Step 3: Analyze the Options
1. **Force:** This is the push or pull that one body exerts on another. It is a fundamental concept in physics and is essential for understanding motion and interaction.
2. **Pressure:** This is the force applied per unit area. While pressure can result from force, it is not the direct effect of interaction.
3. **Speed:** This refers to how fast an object is moving and does not directly relate to the interaction between two bodies.
4. **Collision:** This refers to the event when two bodies hit each other, but it does not necessarily imply a continuous interaction.

**Hint:** Focus on the fundamental concept that describes the interaction between two bodies.

### Step 4: Conclude the Answer
The correct term to fill in the blank is "force." When two bodies interact, they exert a force on one another. This force can be attractive or repulsive, depending on the nature of the bodies involved (like magnets).

**Final Answer:** Two bodies must interact with each other in order to be able to exert a **force** on one another.