Contact Forces

1. Applied Force:

   • Definition: A force that is applied to an object by a person or another object.
   • Example: Pushing a shopping cart.

2. Spring Force:

   • Definition: A force exerted by a compressed or stretched spring upon any object that is attached to it.
   • Example: The force that pulls a spring back to its original shape when it is compressed or stretched.

3. Drag Force:

   • Definition: The resistance force caused by the motion of a body through a fluid, such as air or water.
   • Example: The resistance felt when a plane flies through the air.

4. Frictional Force:

   • Definition: The force that opposes the motion of an object when it moves over a surface.
   • Example: The force you feel when you try to slide on ice with skis.

5. Normal Force:

   • Definition: The support force exerted upon an object that is in contact with another stable object.
   • Example: The force that a table exerts upward on a book resting on it.

Non-Contact Forces

1. Magnetic Force:

   • Definition: The force exerted by magnets when they attract or repel each other.
   • Example: The force that pulls a magnet toward a refrigerator door.

2. Electric Force:

   • Definition: The force between charged objects.
   • Example: The attraction or repulsion between the positive and negative ends of a battery.

3. Gravitational Force:

   • Definition: The force that attracts any two objects with mass toward each other.
   • Example: The force that pulls an apple down to the ground from a tree.