Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The document defines key terms related to motion including force, inertia, friction, position, speed, velocity, acceleration, deceleration, incline, pendulum, and gravity. It provides examples of how these concepts relate to Newton's First Law.

1. force inertia friction position speed Newton’s First Law of Motion velocity acceleration deceleration incline pendulum gravity Chapter 14, Lesson 1Newton’s First Law – The Law of Inertia

2. force – a pull or push that acts on an object

3. inertia – then tendency of an object to resist a change in its state of motion

4. friction – a force that opposes the motion of one object moving past another

5. position – a comparison of an object’s location on a map to other things on the map

6. position – a comparison of an object’s location on a map to other things on the map

7. speed – how fast the position of an object changes with time at any moment

8. velocity – the speed of a moving object taken together with its direction of travel

9. acceleration – a change in velocity

10. acceleration – a change in velocity

11. deceleration – when a force causes the speed of an object to decrease

12. incline – a ramp/slope

13. pendulum – something hanging from a fixed point that swings due to gravity and then out due to inertia Click on the picture below to check out a link on pendulums

14. gravity – something hanging from a fixed point that swings due to gravity and then out due to inertia Click on the picture below to check out a link on gravity.