20-21 Forces and Newton's Laws

The force that resists sliding between two surfaces

• applied force

• gravitational force

• normal force

• frictional force

This force supports the weight of one object on another

• applied force

• gravitational force

• normal force

• magnetic force

This force is from the push or pull of a person

• applied force

• gravitational force

• normal force

• electric force

the frictional force between air and objects moving through it

• air resistance

• frictional force

• buoyant force

• electric force

the force felt when two objects are attracted because of their mass and distance between them

• tension force

• frictional force

• gravitational force

• electric force

an object with more mass will have more

• tension force

• frictional force

• gravitational force

• electric force

when forces are equal and pulling in opposite directions

• balanced force

• unbalanced force

when forces are NOT equal or are NOT pulling in opposite directions

• balanced force

• unbalanced force

when a BALANCED force is put on an object the object will

• change its motion

• sit still

• continue to do whatever it was doing

when an UNBALANCED force is put on an object the object will

• change its motion

• sit still

• continue to do whatever it was doing