CH. 3-Force and Newton's 3 Laws of Motion

Weight

force of gravity on an object

Inertia

mass that an object measures

Force

causes changes in velocity

Force is needed...

to speed up, slow down, and change direction

kg

metric unit of mass

Newton's First Law of Motion

objects at rest tend to stay at rest unless there is an opposing force

Newton's Second Law of Motion

F=ma

Newton's Third Law of Motion

balloon flying around as air comes out

Unit of force

Newton

Acceleration of gravity...

same for object of different weights

4.4 N

1 lb

What is the force needed to accelerate 5 kg at 10 m/s² ?

50 N

7.4 kg into Newtons

72.5 N

When you go from 10 m/s to 5 m/s in 5 sec.

-1 m/s²

When you go from 0 m/s to 5 m/s in 5 sec.

1 m/s²