NAME________ DATE___

PER____ Newton's
Laws of Motion

I. Newton's First Law

Inertia:
tendency of an object to resist _____.

An object will keep moving at a
constant speed, unless an __________ force acts on it. OR:

If all the ______ in a direction
are balanced, then the object doesn't change _____.

(Bodies in
motion stay in motion, bodies at rest stay at rest)

REMEMBER: Having NO forces means
they are ________.

An object at
____ has a constant speed of _______.

EXAMPLES:
Tape at rest on table, 2 people pushing on a chair, coin on a card, tablecloth,
throwing a ball, a car going 55 MPH on cruise control (gas vs friction).

II. Newton's
Second Law, F=mA

If
the forces in a direction are _________, the object will change _____. (____________).

Force
(n)= Mass (kg) times Acceleration (m/s2)

Force
= mass * change in speed / time

The
force needed to change speed is proportional to the ____, also, the larger the
mass, the ____ the _____________.

(note:
the first law is a special case of the second law, f=ma with the force and the
acceleration both zero)

EXAMPLES:
A heavy ball and a light one, stopping a car like SUPERMAN, catching a
baseball, car mileage, fruit being crushed.

III. Newton's
Third Law, Action/Reaction

When
an object exerts a force on another, it exerts the same force back. F(1)=F(2).

EXAMPLES:
book on table, pulling string, 2 scales, bat/ball, rifle, you on chair, car
crash, skates, balloon)

FOR YOU TO ANSWER:

Find
two examples of each of Newton's Laws. These can be from TV, sports, play,
etc... About 3-4 sentences each. Example: My cat was sliding across the waxed
kitchen floor with a mouse in his mouth. When he ran into the basket on the
floor, the mouse popped out and went flying. This is an example of inertia,
because the cat was going at a constant speed (no friction force) until stopped
by the force, while the mouse wasn't, so it kept going at a constant speed.

NAME_______ DATE______PERIOD_____ NEWTON's
LAWS I

WHAT PARTS OF A DISTANCE TIME
GRAPH SHOW NEWTON'S FIRST OR SECOND LAW? LABEL EACH PART:

WHAT PARTS OF A SPEED TIME GRAPH
SHOW NEWTON'S FIRST OR SECOND LAW? LABEL EACH PART:

An older incorrect theory of
motion stated that an object's motion would continue only as long as there was
a force applied to the object. Some science fiction movies would even show
rockets traveling through space with their engines roaring to keep the rocket
moving at a constant speed. How does this old theory disagree with Newton's
First Law of Motion? Why do you think people had that theory?

Is it true that the car below will
stop? Why or why not?

NAME___________ DATE_______PERIOD_______ NEWTON'S
LAWS I

Write a 1, 2, or 3 next to each
occurrence listed to show which of Newton's Laws applies best:, For H and I
sketch a distance and speed-time graph.

A.
A Book lying undisturbed on a table.

B.
A comet passing Jupiter is accelerated by Jupiter's great gravity.

C.
A rocket soars skyward as the engine fires come out.

D.
A baseball hits the catcher's mitt when the batter misses.

E.
A hockey player' stick bounces backwards when he hits the puck.

F.
A car does not move until the engine is started and put in gear.

G.
A chair with wheels moves back when the person pushes on the desk.

H.
A falling object accelerates as it falls towards the earth.

I.
An object thrown up in the air eventually falls back down.

J.
An open air balloon flies around the room.

K.
A dresser doesn't move when pushed.

L.
a gust of wind blows an arrow in flight off target.

M.
A bowling ball is deflected as it strikes the pins.

N.
A diving fighter pilot gains speed.

O.
An airliner lifting off the runway during takeoff.

P.
A jet flying level at a constant 2000 km/hr.

Q.
A tennis ball is smushed as it contacts and bounces off the racket.

NAME_______ DATE____PERIOD_____ NEWTON'S LAWS II

NEWTON'S
LAWS IN MOTION

Coach
Rogers had 6 positions

to fill on his football team. In

order to be considered for a

particular position the players

has to meet certain physical

criteria.

LINE: Stops other players.

requires
great strength in a

short
distance

BACK: Runs with football. Requires speed and agility.

END: May block as a lineman or act as a pass
receiver. Requires a balance of both speed and strength.

Coach Jones had physical data from each player, their weight
and their time and final speed in the 36 meter dash. Use your knowledge of
Newton's Laws to assign each the players to the position for which they are
best suited.

MASS(on
Earth) in kg = Weight in Newtons divided by 9.8 m/s2.

Acceleration
in m/s2 = Change in velocity
divided by time.

Force
in Newtons = Mass in kg times Acceleration in m/s2

1. Calculate the Mass,
Acceleration, at Force at finish line for each player.

PLAYER WEIGHT MASS SPEED at Finish TIME ACCELERATION FORCE

(N) (kg) (meters per sec) (sec) (m/s2) (Newtons)

ALLEN 833
N 16
m/s 4.5 s

TERRY 735
N 16.4
m/s 4.4 s

FRANK 911
N 15
m/s 4.8 s

DAVE 823
N 15.3
m/s 4.7 s

BOB 1000
N 14.7
m/s 4.9 s

CARLOS 931
N 15.7
m/s 4.6 s

2. Select two players for each
position. Assign each player to a position. Explain your

selections in terms of Newton's
Laws.

POSITION PLAYER REASONING

Line 1

Line 2

Back 1

back 2

End 1

End 2

3. Assuming that their
acceleration remained the same, how many kilograms would Dave have to gain to
exert the same force at the finish line as Allen?

Force
(Allen) = Mass (new) times Acceleration (Dave)

mass
= Force divided by Acceleration

4. Coach Rogers particularly
needed a fullback who not only had speed, but would be difficult for opposing
players to bring down. Which of the six players did he choose? Explain the
physical principals that governed his choice.

5. Suppose that Bob, who you know
has a mass of 102 kg, has a force of 306 Newtons at the finish line, and hits
Terry, who is standing still, head on for exactly one second. How fast would
Terry, with a mass of 75 kg, move backwards?

Force
= Mass times (Change in Speed/Time)

Change
in Speed = Force times Time / Mass