Physics - The Interactions (The Fundamental Forces)
Some of the more familiar electromagnetic interactions include...
- Friction - Tension - Normal Force - Buoyant Force
Most of our everyday experiences can be explained by only two of the fundamental forces. They are...
- Gravitational Force - Electromagnetic Force
Friction...
- acts between 2 surfaces in contact - the interaction when solid surfaces slide past each other
A normal force is exerted on an object...
- acts perpendicular to the surface - When an object rests on a rigid surface, it is the normal force exerted by the surface that supports the object. Ex: sitting in a chair
The electromagnetic force is responsible for...
- attracting and repelling - objects seeming to be solid and substantial
The tension force...
- is always a pull - always tries to pull things towards its midpoint; it cannot push objects away
The force of gravity...
- is the weakest of the interactions - it hold together the largest structures (galaxies)
Earth's gravitational force always acts...
-over enormous distances - always pulls objects toward each other
The four fundamental forces found in the universe are...
1. Gravitational Force 2. Electromagnetic Force 3. Strong Nuclear Force 4. Weak Nuclear Force
Which fundamental force accounts for the apparent solidity and substance of everyday objects?
Electromagnetic Force
When you push hard on an object and it does not move, it is probably because...
The static friction between the 2 objects is canceling your push. - when objects aren't in motion, they have static friction Ex: The static friction between the floor and the refrigerator is canceling your push.
When two rough surfaces slide pst one another...
This is kinetic friction. Ex: A baseball player sliding into home base.
Objects participate in electromagnetic interactions because they have...
an electric charge (positive or negative)
The strength of the gravitational force between two objects depends upon...
distance between the centers of the interacting objects.
The reason you do not notice the your pencil and your textbook attract each other is that...
gravity is weak unless at least one of the objects has a ginormous amount of inertia.
Gravity exists between objects that have...
inertia (in all physical objects)
