1.4 Forces change motion.

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Presentation transcript:

1.4 Forces change motion

Vocabulary #1 Page 41 Force Net force Newton’s first law Inertia Newton’s second law Centripetal force Page 57 Newton’s third law

How can you change an object’s motion?

A force is a push or a pull Types of force 1 Contact force 2 Gravity 3 Friction

Size and direction of force Vector (size and direction)

Balanced and unbalanced forces If the net force on an object is zero, the forces acting on the object are balanced. Only an unbalanced force can change the motion of an object.

Balanced forces cannot change an object’s speed or it’s direction. An unbalanced force is needed to change an object’s motion.

Newton’s first law relates force and motion.

Newton’s first law Objects at rest remain at rest, and objects in motion remain in motion with the same velocity unless acted upon by an unbalanced force.

INERTIA Resistance of an object to a change in the speed or the direction of its motion.