Newton’s 1st Law
Inertia
Inertia
Artist: John Vanderbank
(of motion)
An object will continue in its present state of motion unless acted upon by an unbalanced external force.
Force equals mass times acceleration.
For every action, there is an opposite and equal reaction.
1st
2nd
3rd
Newton’s Three Laws
(of motion)
Mass�Weight�Volume�Density�Specific Gravity
MASS�The QUANTITY of matter.�(How much material there is)
www.ohaus.com
UNITS?
kilograms
WEIGHT�The gravitational FORCE�on the matter.�(How strong gravity pulls on the matter)
http://dualit.125west.com/html/kitchenscale.html
UNITS?
Newtons
1 Kilogram of mass �weighs 9.8 Newtons
http://store.pasco.com/pascostore/showdetl.cfm?&DID=9&Product_ID=53518&Detail=1
MASS
FORCE�“Weight”
9.8 Newtons
1.6 Newtons
MASS
WEIGHT
1 Kilograms
1 Kilograms
www.ohaus.com
www.ohaus.com
9.8 Newtons
1.6 Newtons
VOLUME�The SIZE of the matter.�(How much space it takes up)
http://store.hvchemical.com/browse.cfm/4%2C235.html
http://www.alfi-knife.com/knives_cutlery/OXO76182.html
UNITS?
Meters3
Clifton Bluhm
http://www.freestufftimes.com/whatigot/wp-content/uploads/2009/09/100_6669.jpg
DENSITY�The RATIO of Mass to Volume.�(How much matter is compacted into a certain volume)
kg
m3
Fundamental UNITS?
M.K.S
Zinc
Lead
Aluminum
Tin
Copper
http://www.sargentwelch.com/product.asp_Q_pn_E_WL1136%5FEA_A_Equal+Mass+Metal+Cylinder+Set%2C+BASIX_E_
Density�The RATIO of Mass to Volume.�(How much matter is compacted into a certain volume)
http://www.dollhouseminiatures.net/product_info.php?products_id=392&osCsid=8c96bc977d058258df9b3c236bde7d79
Which quantity DECREASED?
Which quantity INCREASED?
Which quantity remained the same?
Density
Volume
Mass
Mass Density�The RATIO of mass to volume.
Weight Density�The RATIO of weight to volume.
Specific Gravity�The RATIO of weight of material to the weight of an equal volume of water.
kg
m3
N
m3
None
An object’s RESISTANCE to�changes in motion.
An object’s RESISTANCE to�acceleration.
is directly proportional to
Inertial Mass
Which ball would hurt more if kicked?
WHY?
More mass, more inertia!
http://www.northerntool.com/images/product/images/150104_lg.jpg
Concrete
Air
Free Fall
Explained
FORCE of gravity acting on it?
Which object has more:
INERTIA?
RESISTANCE TO ACCELERATION?
ACCELERATION when dropped?�(in a vacuum)
http://www.onecall.net/~etharp/feather.jpg+
http://img.alibaba.com/photo/50194446/Fibre_Handle_Claw_Hammer.jpg
MASS?
Hammer
Hammer
Hammer
Hammer
They both accelerate at the same rate. 9.8 m/s2
Newton’s 1st Law
(of motion)
An object will continue in
its present state of motion
unless acted upon by
an unbalanced external force.
An object will continue
not accelerating
unless acted upon by
an unbalanced external force.
500 mi/hr
500 mi/hr
Which direction did the earth suddenly jolt?
http://2.bp.blogspot.com/_ZkSl7JBP8Pc/SM2NTq_Q7TI/AAAAAAAAAYs/YFpoLL4wVRw/s1600-h/33472_78_still_better_than_a_day_at_work.jpg
http://www.ultramagic.net/alphabet/alphabet_soup.jpg
Inertia Switch
Inertia Wheel Seat Belt
Seat Belt�Inertia Wheel
Seat Belt�Inertia Wheel
Seat Belt�Inertia Wheel
“Strong Legs” – Monster
Hans Device
www.chayanin.net/images/30%20Passenger%20seat.jpg
http://www.ridgid.com/ASSETS/DBD3956D7EE04D3A9AFEF1E3D1DB26C0/606_Tool_Box_3C.jpg
http://www.tool-boxes.us/tool-box-424.jpg
No Excuse Belt Campaign
http://media.putfile.com/ejection
http://media.putfile.com/ejection
http://media.putfile.com/ejection
These guys did NOT fall out of the boat . . .
The boat fell out of them!
http://www.wt.tno.nl/whiplash1/artwork/dummy3.jpg