FORCE-is a push or pull upon an object

- any influence that causes an object to undergo a certain change, either concerning its movement or direction

NONCONTACT FORCES- the objects are not in contact with each other.

GRAVITY

CONTACT FORCES- the objects have to be in contact with each other.Force between

road and the tires of a car

KINDS OF

FORCES

Gravitational Force- It is an attraction, or pull between objects. - It affects anything that has mass.

Dependence on Mass Dependence on Distance

Dependence on Mass

More massive planet =

more/large weight

Less massive planet = less/small

weight

Dependence on Distancenearer distance

= greater gravitational forcefarther distance = lesser gravitational force

Electromagnetic Force- It is associated with electrical charge and magnetism.

Electromagnetic Force- It causes the interaction between electrically charged particles; - the areas in which this happens are called electromagnetic fields.

Weak Force- It is actually stronger than the gravitational force.- It is active only at distances less than 10-18.Strong Force

- It acts only on hadrons and keeps them tightly packed within the nucleus.

Frictional Force- It is the resistive force that occurs when two surfaces contact each other.

Tension Force- It is the force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.

Normal Force- It is the support force exerted upon an object that is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.

Applied Force- It is a force that is applied to an object by a person or another object. - If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person.