2.1+-+pp.+48-49

=D. Newton's First Law of Motion=

1. Inertia- tendency of an object to resist change in its motion. a. Galileo Galilei- 1600's astronomer

I. Objection in motion- no push or pull is needed to keep it moving ii. Force is needed only to change the motion of an object iii. Every object resists any change to its motion

=B. Newton's First Law of Motion= = = 1. Sir Issac Newton I. English mathematician ii. 1600's

2. An object at rest will remain at rest

3. An object that is moving at constant speed will continue moving at constant speed unless acted upon by an unbalanced force

4. Law of inertia

=C. Mass= 1. The amount of matter in an object

2. SI unit is the kilogram

3. Amount of the inertia of an object

4. A measure of the inertia of an object

5. Inertia increases as the mass of an object increases = = =Study Guide= = = 1. A carpenter hammering a nail 2. They add together 3. Inertia 10. Force 13. Mass 14. gravity 16. True 29. The head indicates the direction of the force. + = =