# Newton's Thrid Law Of Motion

D.) Is exactly EQUAL in magnitude.
Wherever there is an action force, there must be a reaction force which:
E.) Arrow’s push against the bowstring.
An archer shoots an arrow. Consider the action force to be exerted by “THE BOWSTRING AGAINST THE ARROW.” the REACTION force is the:
C.) Force that the ball exerts on the bat.
A player hits a ball with a bat. The action force is the “IMPACT OF THE BAT AGAINST THE BALL.” The REACTION force is the:
C.) 1000 N.
(Newtons 3rd Law of Motion: ACTION & REACTION)
A baseball player bats a ball with a FORCE of 1000 N. The REACTION force that the ball exerts against the bat is:
C.) Pull of the ball’s mass on the earth.
(ACTION & REACTION)
As a ball falls, the ACTION force is the “PULL OF EARTH’S MASS ON THE BALL.” The REACTION force is the:
C.)500-N
(EQUAL & OPPOSITE)
A person is attracted towards the center of the Earth by a 500-N GRAVITATIONAL FORCE. The Earth is attracted toward the person with a FORCE of:
A.) These two pulls comprise an action-reaction pair.
(ACTION & REACTION)
The EARTH pulls on the MOON. Similarly the moon PULLS on the Earth, evidence that:
C.) Same for both.
(NEWTONS 3RD LAW (ACTION & REACTION)
An automobile and a baby carriage traveling at the SAME SPEED collide head-on. The “IMPACT FORCE” is:
A.) VOLKSWAGEN
A Mack truck and a Volkswagen traveling at the SAME SPEED have a head-on collision. The vehicle that undergoes the GREATEST CHANGE IN VELOCITY will be the:
C.) 8.0-N
(10.0N-2.0N=8.0N)
A 10.0 N force is PULLING UP on the ring of a spring scale that WEIGHS 2.0 N. If an 8.0 N MASS is attached to the BOTTOM hook of the scale, the scale reading would be:
D.) Pushes Joe EQUALLY hard even without waking up.
(SAME FORCE APPLIED!)
Joe PUSHES Bill, who is asleep. Bill:
D.) 4000-N
(CONSTANT FORCE HAS NO NET FORCE CAUSING THERE TO BE NO ACCLERATION THEREFORE IT WEIGHS THE SAME.)
A vehicle that weighs 4000-N on the SURFACE OF THE EARTH is traveling in OUTER SPACE at a SPEED of 200 m/s. The SMALLEST CONSTANT FORCE that must be applied to stop in 20 seconds is:
B.) Moves towards the Earth, but a SMALLER distance.
(OPPOSITE & EQUAL) (ACTION-REACTION)
During the time of year when the EARTH STARTS MOVING CLOSER TO THE SUN, the sun:
B.) 4M
(12/2=6)
(6-2=4m)
or (4+2=6m)
Two people, one TWICE as MASSIVE as the other, attempt a tug-of-war with 12 METERS of massless rope on frictionless ice. After a brief time, they meet. The HEAVIER person slides a DISTANCE of:
The Y-axis.
What is a vertical vector?
The X-axis.
What is a horizohntal vector?
Acceleration* Mass= FORCE
(Acceleration times mass equals force.)
What is the formula for FORCE?
Force/Mass= ACCELERATION
(Force divided by mass equals acceleration.)
What is the formula for ACCELERATION?
A(2)+B(2)=C(2)
What THEROM do you use to find the resultant of TWO VECTORS AT RIGHT ANGLES?
25KM/HR NORTH
(100Km-75Km=25Km/Hr North)
Calculate the RESULTANT of the pair of velocities 100 km/h NORTH and 75 km/h SOUTH. Calculate the RESULTANT if both of the VELOCITIES are directed NORTH:
141.42km/hr
(100(2)+100(2)=C(2)
100(2)*2=20000
Square root of 20000 is (141.42km/hr)
Calculate the MAGNITUDE of the RESULTANT of a pair of 100-km/hr VELOCITY VECTORS that are at right angles to each other:
5 units
3(2)+4(2)=C(2)
9+16=25
Square root of 25 is (5)
Calculate the RESULTANT of a horizontal vector with a MAGNITUDE of 4 units and a vertical vector with a MAGNITUDE of 3 units.
200km/h
50(2)+200(2)=C(2)
2,500+40,000=C(2)
Square root of 42,500 is ~ 206.15= (200km/h)
Calculate the RESULTANT VELOCITY of an airplane that “normally” flies at 200km/h if it ENCOUNTERS a 50-km/h wind from the side (at a RIGHT angle to the airplane).
2-N
(25 METERS PER SECOND/0.05 SECONDS=500M/S)
(500M/S)*(0.003KG)= ~1.5 N= (2-N)
A boxer punches a sheet of paper in midair and brings it from REST up to a SPEED of 25m/s in 0.05 s. If the MASS of the paper is 0.003 kg, what FORCE does the boxer exert on it?
40-N (push back on you),
.5m/s
40/80=.5
If you stand next to a wall on a FRICTIONLESS skateboard and PUSH the wall with a FORCE of 40-N, how hard does the wall push on you? If your MASS is 80kg, what’s your ACCELERATION?(force divide by mass).
5m/s
3(2)+4(2)=C(2)
9+16=C(2)
Square root of 25 is (5m/s)
If raindrops fall VERTICALLY at a speed of 3m/s and you are running at 4m/s, how fast do they hit your face?
The Net Force of the horse will cause it to accelerate,because the horse is an external force.
A farmer urges his horse to PULL a wagon. The horse refuses, saying that to try would be futile, for it would flout Newton’s 3rd Law. The horse concludes that she can’t EXERT a GREATER force on the wagon than the wagon EXERTS on her, and, therefore, that she won’t be able to ACCELERATE the wagon. What is your explination to convince the horse to PULL?
A.) vector
B.) niether
C.) scalar
D.) scalar
E.) vector
Which of the following are scalar quantities, which are vector quantities, and which are niether? A.) VELOCITY; B.) AGE; C.) SPEED; D.) ACCELERATION; E.) TEMPERATURE
VECTOR QUANTITY
Any quantity that requires BOTH magnitude and direction for a complete description is called a ___________ ______________.
MAGNITUDE
A measurement without direction…
ARROW
A vector quantity is usually represented with a ________; the SIZE and DIRECTION represent MAGNITUDE and DIRECTION of forces.
PAIR
Interaction REQUIRES a _______ of forces.
SYSTEM
It is important to consider the ________ being investigated in order to figure out what FORCES are ACTING.
Action Force
Reaction Force
Every force is part of an INTERACTION between one thing or another. We call one FORCE the _________ ________ and the OTHER force the __________ _________.
Law
Acceleration
Newton’s 2nd Law of motion is also known as the ________ of _________________ .
MASS
_________ is a measure of interia.
Terminal Speed
When an object’s WEIGHT EQUALS air resistance during a FALL and ACCELERATION terminates, the object continues to FALL at a CONSTANT SPEED. The SPEED is known as _____________ ___________.
Law
Interia
Newton’s 1st Law of Motion is also known as the ________ of ________.
Terminal Speed
What is the constant maximum velocity reached by a body falling under gravity through a fluid, espically the atmosphere.
Scalar
Quantity
Any quantity that requires ONLY magnitude for a COMPLETE description is called a _________ _________.
Resultant
The sum of TWO or MORE VECTORS is called the ________.
Vector
The ARROW used to represent VECTOR QUANITIES is simply referred to as a ________.
Action
Reaction
Newton’s 3rd law of motion is also known as the _______ of ______.
Lift
The UPWARD REACTION force that causes a helicopter to rise in the air is called _______.