Identifying Forces

The force exerted by a surface perpendicular to an object resting on it (like a table supporting a book)

• Normal force

• Friction

• Applied force

• Gravity

The force opposing the motion of an object

• Friction

• Applied force

• Gravity

• Magnetic force

The force exerted by a person or object directly pushing or pulling on another object

• Applied force

• Gravity

• Magnetic force

• Electric/ electrostatic force

The force of attraction between any two objects with mass

• Gravity

• Magnetic force

• Electric/ electrostatic force

• Normal force

Tags

NGSS.MS-PS2-4

The force of attraction or repulsion between magnetic poles

• Magnetic force

• Electric/ electrostatic force

• Normal force

• Friction

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The force of attraction or repulsion between charged particles

• Electric/ electrostatic force

• Normal force

• Friction

• Applied force

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Occurs when two surfaces are touching and at rest relative to each other. This is the strongest type of friction

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

Also known as kinetic friction, this type of friction occurs when two surfaces are sliding past each other

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

Occurs when a ball, wheel, or cylinder rolls over a surface. This is weaker than static or sliding friction

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

Occurs when an object moves through a fluid, such as a liquid or gas. The faster or larger the surface area of the object, the greater the fluid friction. Air resistance is this form of friction.

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction