Transcript CPO – 3.1 Force, Mass and Acceleration

Bell Work Oct 14, 2013
Pg. 26
Title: 3.1 Reading
Read Chapter 3.1 and write 3
statements from the chapter that
includes an illustration for each.
Pg. 27
Title: 3.1 Notes
Force, Mass, and Acceleration
http://www.cpo.com/ipcres/book
TOC.html
• Link to chapter 3.1
Newton’s 1st law of motion:
• An object at rest will stay at rest. An
object in motion will stay in motion.
• Also called the law of inertia.
• Inertia – the property of an object to
resist changing its state of motion.
Force
• A push or pull
• Any action that has the ability to
change motion.
– All forces have both size and direction.
– All forces are exerted by one object on
another object.
– All forces are measured in Newtons (N).
Units of Force:
• Newton
• 1kg multiplied by 1m/sec2 is equal to 1 Newton
Inertia
The amount of inertia an object has
depends on its mass.
Newton’s 2nd Law of Motion:
• Force causes acceleration
• Mass resists acceleration
• The acceleration you get is equal to the
ratio of force over mass.
F
m a
Balanced vs. Unbalanced
forces
• The motion of an object depends on the
total of all forces acting on the object
• Net force equals the total of all forces
Net Forces
Equilibrium - occurs when forces on an object
are balanced and the net force is zero which
means there is no change in motion
Mass vs. Weight
• Mass – The amount of matter in an
object.
– Does not change
• Weight – Dependent on gravity