# Force examples

In physics, a force is defined as a push or pull exerted on an object.[1][2] It is an interaction that can induce a change in the object’s motion.[3] The presence of a force is observed whenever two objects interact with each other.[4]

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## Examples

### Toy train

When a toy train, attached to a thread, is pulled by hand while resting on the floor, an interaction occurs between the hand and the thread. This interaction generates a force that propels the toy train forward. Thus, the hand exerts a force on the toy train to initiate its movement.

### Ball

When someone kicks a ball with their leg, a force is applied to the ball, causing it to move forward. This force is generated through the interaction between the leg and the ball. Therefore, when a ball is kicked with the leg, there is a force exerted by the leg on the ball.

### Glass of water

Consider a glass of water placed on a desk. When a hand is used to pick up the glass, a force is exerted on it. The force of the hand acts on the glass of water, allowing it to be lifted and moved.

### Horse-drawn vehicle

When a horse pulls a cart, an interaction between the horse and the cart generates a force that propels the cart forward. This force, exerted by the horse, enables the cart to move.

### Punching bag

When a person strikes a punching bag with their fist, an interaction occurs between the fist and the bag. This interaction results in a force that causes the punching bag to move forward and be displaced. Thus, when a person hits a punching bag, there is a force exerted by the fist onto the bag.

### Door

When closing a door with your hand, an interaction occurs between your hand and the door. This interaction results in a force that causes the door to move and close. Therefore, when you close a door with your hand, there is a force exerted by your hand on the door.

### Trolley

When a trolley is pushed by hand, a force is applied. The interaction between the hand and the trolley generates this force, causing the trolley to move forward. Thus, the hand exerts a force on the trolley when it is pushed.

### Dumbbell

When a dumbbell is lifted by hand, a force is exerted on it. The interaction between the hand and the dumbbell generates this force, resulting in the upward movement of the dumbbell. Therefore, when someone lifts a dumbbell with their hand, there is a force of the hand acting on the dumbbell.

### Window

In a typical situation, opening a window with a hand involves the application of force. When a window is opened using a hand, an interaction occurs between the hand and the window, resulting in a force being exerted. It is a general principle that when two objects interact, a force is present. Hence, when a window is opened or closed with a hand, a force from the hand acts upon the window.

## Image credit

• The stock photos used in this post are sourced from platforms like Pexels, Pixabay, Canva, etc. Due to the age of the images, their specific origins remain unknown.

## References

1. Force – NASA (.gov)
2. What is Force – National Institute of Standards and Technology (.gov)
3. Forces & Tools – National Park Service (.gov)
4. Forces Lesson 6b: Explaining Forces and Motion in Real-Life Scenarios – Cal Poly Pomona