- A FORCE is a push or pull.
- These pushes and pulls cause matter (objects made of atoms) to move.
- While it may seem obvious that when you push or pull something it will move, there are more ways to move things that just touching them.
- When a push or pull is applied directly to an object by another object.
- Examples include kicking a ball, pulling out a chair or picking up a book.
- In each example one object had to directly touch the other to apply the force.
- Normal force is applied by two touching objects so that they don’t fall or push through each other.
- When you sit down, you and the chair each apply force to each other so that you don’t fall through.
- If the chair stops applying this force to you, you fall to the ground and feel it’s normal force.
- Springs that are stretched or squished will push or pull other objects when they bounce back to their original shape.
- If you’ve every played with a Nerf gun or wind up toy, you enjoyed the force of springs.
- When two objects pull on the side of a string, rope or chain the object applies a tension force back.
- The harder the applied force from the pulling objects the greater the tension the object is rope.
- When one object is slides across another object, the two surfaces are pressed together and apply a force that resists the motion.
- Click on the FRICTION button at the bottom to learn more about the factors that increase or decrease friction.
- Since air is made of atoms, it provides a surface that pushes against anything moving into it.
- The greater the size of the surface, the greater the air resistance and the slower the object will move.
- Checkout factors that influence air resistance in this video
- Gravity is a force of attraction between 2 masses and they do not need to be touching to apply this force to each other.
- Larger masses apply a greater gravitational pull as do closer objects.
- To learn more about gravity, click on the button at the bottom of the page!
- Magnets attract or repel other magnets or magnetic materials through electric fields.
- Opposite magnetic poles pull on each other with a force of attraction.
- Similar magnetic poles push away from each other with a force of repulsion.
- Electrons are super small particles that can exist within atoms but also travel around the universe applying forces to objects when they buildup and move.
- Opposite electric charges pull into each other with a force of attraction.
- Similar electric charges push away from each other with a force of repulsion.
How do we use these forces everyday?
What’s next?
I’m lost😱
This is the beginning of the unit, so the only way to go is back to the start page
I need practice 🤔
This is a lot of vocab and concepts!
Let’s move on👍
How do these forces impact our daily life