Harrison, X.A. Tregenza, T. Inger, R. Kendrew, C. Dawson, D.A. ...
N EWTON ’ S 2 ND L AW B ELL R INGER Look at your 10 notes and 3 pictures. Share at least one item...
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Transcript of N EWTON ’ S 2 ND L AW B ELL R INGER Look at your 10 notes and 3 pictures. Share at least one item...
NEWTON’S 2ND LAW
BELL RINGER
Look at your 10 notes and 3 pictures. Share
at least one item (note or picture) to
the table notes. Feel free to take others’
ideas as well!
NEWTON’S 1ST LAW LAW OF INERTIA
This is ZERO fun!!!
Objects at rest stay at rest (balanced force) unless…
12 N 12 N
NEWTON’S 1ST LAWLAW OF INERTIA
There is a Net (Unbalanced Force). Unbalanced forces cause objects to
ACCELERATE!
Eat it!!!
Don’t wipe that on
me!
12 N
20 N
Acceleration: velocity change over a period of time
How do we know if velocity changes?
Velocity changes if speed changes, direction changes,
or if both change. So, an object accelerates if its
speed, its direction, or both change.
REMEMBER…
IF I APPLY THE SAME FORCE TO BOTH A BASEBALL AND SHOTPUT, WHICH ONE WILL HAVE LARGER ACCELERATION?
Baseball
Shotput
More Inertia
Unbala
nce
d F
orc
e
NEWTON’S 2ND LAW
When we are working with unbalanced forces, there is a relationship between force, mass
and acceleration.
F = ma
Net Force
(F)
Mass (m)
Acceleration (a)
m=F/a
a=F/m
NEWTON’S FAMILY PICTURE
Five...Five dollar
foot long!
Honestly…I said say ‘cheese’,
not pick it!
=
Think of the F and the ma as being on opposite sides of a teeter-totter that you
always want to keep in balance.
Force
Small mass
Large acceleration
F =
ma
Force
Large mass
small acceleration
F =
ma
Force
WHAT HAPPENS NOW IF WE APPLY THE SAME FORCE AS BEFORE BUT NOW WE HAVE LARGER MASS?
Keep your see-saw in mind…
DRAW A SEE-SAW EXAMPLE FOR EACH OF THE FOLLOWING EXAMPLES.
SameAcceleratio
n
Same Acceleratio
n
Small Mass
Large Force
Large Mass
Small Force