Newton�s Laws

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```					   Newton’s Laws
May the “Force” be with you!
Newton Concept Review

DIFFICULTY LEVEL
I
Newton Concept Review
Arnold Strongman and Suzie Small each pull
very hard on opposite ends of a rope in a
tug-of-war. The greater force on the rope
is exerted by
• A) Suzie, surprisingly.
• B) Arnold, of course.
• C) both the same, interestingly enough.
Newton Concept Review
Whenever the net force on an object
is zero, its acceleration

• A) may be more than zero
• B) may be less than zero.
• C) is zero.
Newton Concept Review
A 10-N falling object encounters 4 N
of air resistance. The net force on
the object is
• A) 4 N.
• B) 10 N.
• C) 0 N.
• D) 6 N.
• E) none of these.
Newton Concept Review
An object's weight may properly be
expressed in units of

•   A) cubic centimeters
•   B) kilograms.
•   C) meters.
•   D) newtons.
Newton Concept Review
If an object of constant mass experiences a
constant net force, it will have a constant
• A) velocity.
• B) speed.
• C) position.
• D) acceleration.
• E) more than one of the above
Newton Concept Review
If one object has twice as much mass as
another object, it also has twice as much
• A) acceleration due to gravity.
• B) inertia.
• C) velocity.
• D) volume.
• E) all of these
Newton Concept Review
When a rocket ship accelerating in outer
space runs out of fuel it
• A) accelerates for a short time, then slows
down to a constant velocity.
• B) accelerates for a short time, slows
down, and eventually stops.
• C) no longer accelerates.
Newton Concept Review
A 1-kg mass at the earth's surface weighs
• A)1 N.
• B)9.8 N.
• C)10.8 N.
• D)4.9 N.
• E) none of these
Newton Concept Review
The newton is a unit of
• A) mass.
• B) density.
• C) inertia.
• D) force.
Newton Concept Review
An apple weighs 1 N. When held at rest
apple is
• A) 0 N.
• B) 10 N.
• C) 0.1 N.
• D) 1 N.
• E) none of these
Newton Concept Review
If an object's mass is decreasing while
a constant force is applied to the
object, the acceleration
• A) increases.
• B) remains the same.
• C) decreases.
Newton Concept Review
A sheet of paper can be withdrawn from under a
container of milk without toppling it if the paper
is jerked quickly. This best demonstrates that

•   A) gravity tends to hold the milk carton secure.
•   B) there is an action-reaction pair of forces.
•   C) the milk carton has inertia.
•   D) the milk carton has no acceleration.
•   E) none of these
Newton Concept Review
An apple at rest weighs 1 N. The net force
on the apple when it is in free fall is
• A) 0.1 N.
• B) 10 N.
• C) 1 N.
• D) 0 N.
• E) none of these
Newton Concept Review
A 10-N falling object encounters 10 N of
air resistance. The net force on the
object is
• A) 10 N.
• B) 4 N.
• C) 0 N.
• D) 6 N.
• E) none of these
Newton Concept Review
An object is propelled along a straight-line
path in space by a force. If the mass of
the object somehow becomes twice as
much, its acceleration
• A) halves.
• B) stays the same.
• D) doubles.
• E) none of these
Newton Concept Review

The force of friction on a sliding object is 10
newtons. The applied force needed to
maintain a constant velocity is
• A) more than 10 N.
• B) 10 N.
• C) less than 10 N.
Newton Concept Review
A kilogram is a measure of an object's
• A) force.
• B) size.
• C) weight.
• D) mass.
Newton Concept Review
Strange as it may seem, it is just as hard to
accelerate a car on a level surface on the moon as
it is here on the Earth. This is because

• A) the weight of the car is independent of
gravity.
• B) the mass of the car is independent of gravity.
• C) Nonsense! A car is much more easily
accelerated on the moon than on the Earth.
Newton Concept Review
An object is propelled along a straight-line path by a
force. If the net force were doubled, the
object's acceleration would be
• A) twice as much.
• B) four times as much.
• C) the same.
• D) half as much.
• E) none of these.
Newton Concept Review
Compared to a 1-kg block of solid iron,
a 2-kg block of solid iron has the same
• A) mass.
• B) weight.
• C) volume.
• D) all of these
• E) none of these
Newton Concept Review
Wherever the is an action force, there must
be a reaction force which
• A) is slightly smaller than the action
force.
• B) always acts in the same direction.
• C) is slightly larger than the action force.
• D) is exactly equal and opposite.
Newton Concept Review
• A) a property of mechanical equilibrium.
• B) equal to your mass.
• C) the gravitational attraction force
between you and the Earth.
• D) all of these
Newton Concept Review
If no external forces are acting on a moving
object it will
• A) continue moving at the same velocity.
• B) continue moving at the same speed.
• C) move slower and slower until it finally
stops.
Newton Concept Review
Compared to a 1-kg block of solid iron, a 2-kg
block of solid iron has twice as much
• A) volume.
• B) inertia.
• C) mass.
• D) all of these
Newton Concept Review
Compared to the mass of a certain object on
Earth, the mass of the same object on the
moon is
• A) the same.
• B) zero.
• C) one sixth as much.
• D) six times as much.
Newton Concept Review
A baseball player bats a ball with a force of
1000 N. The reaction force that the ball
exerts against the bat is
• A) more than 1000 N.
• B) less than 1000 N.
• C) 1000 N.
• D) impossible to determine.
Newton Concept Review
An object maintains a constant acceleration
unless there is a change in
• A) the air resistance.
• B) the applied force.
• C) its mass.
• D) any of the above
Newton Concept Review
An object is pulled northward by a force of
10 N and at the same time another force
of 15N pulls it southward. The net force
on the object is
• A) 5 N.
• B) 0 N.
• C) 150 N.
• D) 25 N.
Newton Concept Review
A force is a vector quantity because it
has both
• A) mass and acceleration.
• B) magnitude and direction.
• C) action and reaction counterparts.
Newton Concept Review

DIFFICULTY LEVEL
2
Newton Concept Review
A automobile and a baby carriage
traveling at the same speed collide
• A) greater on the automobile.
• B) greater on the baby carriage.
• C) the same for both.
Newton Concept Review
If more horizontal force is applied to a sliding
object than is needed to maintain a constant
velocity,
• A) the friction force increases.
• B) the object accelerates opposite the direction
of the applied force.
• C) the object accelerates in the direction of the
applied force.
• D) two of the above
Newton Concept Review
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
• A) Volkswagen.
• B) Mack truck.
• C) same for both.
Newton Concept Review
An object following a straight-line path at
constant speed
• A) has no forces acting on it
• B) has zero acceleration.
• C) has a net force acting upon it in the
direction of motion.
• D) none of these
Newton Concept Review
A rock is thrown vertically into the air. At
the top of its path, its acceleration in m/s2
• A) zero.
• B) between 0 and 10
• C) greater than 10
• D) 10
Newton Concept Review
Suppose a particle is being accelerated through space by
a 10-N force. Suddenly the particle encounters a
second force of 10 N in the opposite direction from
the first force. The particle with both forces acting on
it
• A) is brought to a rapid halt.
• B) theoretically tends to accelerate toward the speed
of light.
• C) decelerates gradually to a halt.
• D) continues at the speed it had when it encountered
the second force.
Newton Concept Review
A car traveling at 100 km/hr strikes an
unfortunate bug and splatters it. The
force of impact is
• A) greater on the car.
• B) greater on the bug.
• C) the same for both.
Newton Concept Review
A block is dragged without acceleration in a
straight-line path across a level surface by a
force of 6 N. What is the force of friction
between the block and the surface?
• A) 6 N
• B) more than 6 N
• C) less than 6 N
Newton Concept Review
According to Newton's law of inertia, a rail road
train in motion should continue going forever even
if its engine is turned off. We never observe this
• A) are much too heavy.
• B) must go up and down hills.
• C) move too slowly.
• D) always have forces that oppose their motion.
Newton Concept Review
The mass of a pet turtle that weighs 10 N is
• E) none of these
Newton Concept Review
If the mass of an object does not change, a
constant net force on the object produces
constant
• A) velocity.
• B) acceleration.
• C) both of these
• D) neither of these
Newton Concept Review
• If your automobile runs out of fuel while
you are driving the engine stops but you do
not come to an abrupt stop. The concept
that most explains why is
• A) resistance.      B) acceleration.
• C) inertia.         D) gravity.
Newton Concept Review
• A force of 1 N accelerates a mass of 1 kg
at the rate of 1 m/s^2. The acceleration
of a mass of 2 kg acted upon by a net
force of 2 N is
• A) the same.
• B) twice as much.
• C) half as much.
• D) none of these.
Newton Concept Review
• If less horizontal force is applied to a
sliding object than is needed to maintain a
constant velocity,
• A) the friction force increases.
• B) the object accelerates in the direction
of the applied force.
• C) the object eventually slides to a stop.
• D) none of the above
Newton Concept Review
• A bag of groceries has a mass of 10
kilograms and a weight of
• E) more than 1000 N.
Newton Concept Review
• A tow truck exerts a force of 3000 N on a
car, accelerating it at 2 meters per second
per second. What is the mass of the car?
• A) 500 kg            B) 1500 kg
• C) 1000 kg           D) 3000 kg
• E) none of these
Newton Concept Review
• A girl pulls on a 10-kg wagon with a
constant horizontal force of 30 N. If
there are no other horizontal forces, what
is the wagon's acceleration in meters per
second per second?
• A) 10                 B) 30
• C) 0.3                D) 300
• E) 3.0
Newton Concept Review
• A push on a 1-kg brick accelerates it.
Neglecting friction, to equally accelerate a
10-kg brick, one would have to push with
• A) just as much force.
• B) one tenth the amount of force.
• C) 10 times as much force.
• D) 100 times as much force.
• E) none of these
Newton Concept Review
• The maximum acceleration of a car while
towing a second car twice its mass,
compared to its acceleration with no car in
tow, is
• A) one third.       B) the same.
• C) one half.        D) one fourth.
• E) none of these
Newton Concept Review
• A car has a mass of 1000 kg and
accelerates at 2 meters per second per
second. What is the magnitude of the net
force exerted on the car?
• A) 1000 N           B) 1500 N
• C) 2000 N           D) 500 N
• E) none of these
Newton Concept Review
• A jumbo jet has a mass of 100,000 kg. The
thrust for each of its four engines is
50,000 N. What is the jet's acceleration
in meters per second per second when
taking off? 50)
• A) 1                B) 4
• C) 0.25             D) 2
• E) none of these
Newton Concept Review
• The force required to maintain an object at a
constant velocity in free space is equal to
• A) the force required to stop it.
• B) zero.
• C) the weight of the object.
• D) the mass of the object.
• E) none of these
Newton Concept Review

WARNING! WARNING!
DIFFICULTY LEVEL
3
Newton Concept Review
• A 1-kg ball is thrown at 10 m/s straight
upward. Neglecting air resistance, the net
force that acts on the stone when it is
halfway to the top of its path is about
• A) 7.5 N.            B) 1 N.
• C) 1/2 N.            D) 10 N.
• E) 5 N.

Newton Concept Review
• An astronaut on another planet drops a
• 1-kg rock from rest and finds that it falls
a vertical distance of 2.5 meters in one
second. On this planet, the rock has a
weight of
• A) 1 N.        B) 2 N.     C) 3 N.
• D) 4 N.        E) 5 N.

Newton Concept Review
• A 10-kilogram block is pushed across a
horizontal surface with a horizontal force
of 20 N against a friction force of 10 N.
The acceleration of the block in meters
per second per second is
• A) 5.               B) 2.
• C) 1.               D) 10.
• E) none of these
Newton Concept Review
• A rock weighs 30 N on Earth. A second
rock weighs 30 N on the moon. Which of
the two rocks has the greater mass?
• A) the one on Earth
• B) the one on the moon
• C) They have the same mass.
• D) not enough information to say
Newton Concept Review
• In which case would you have the
largest mass of gold? If your chunk
of gold weighed 1 N on the
• A) Earth.
• B) planet Jupiter.
• C) moon.

Newton Concept Review
• What horizontally-applied force will accelerate a
400-kg crate at 1 m/s to power of ((2)) across a
factory floor against a friction force half its
weight?
• A) 1600 N               B) 2400 N
• C) 600 N                D) 2000 N
• E) none of these

Newton Concept Review
• An object released from rest on another
planet requires one second to fall a distance
of 6 meters. What is the acceleration in
meters per second per second due to gravity
on this planet?
• A) 12           B) 3
• C) 6            D) 15
• E) none of these

Newton Concept Review
• A 10-kilogram block with an initial velocity of
10 m/s slides 10 meters across a horizontal
surface and comes to rest. It takes the block
2 seconds to stop. The stopping force acting
• A) 50 N.              B) 10 N.
• C) 5 N.               D) 25 N.
Newton Concept Review
• A horse exerts 500 N of force on a heavy wagon.
The wagon pulls back on the horse with an equal
force. The wagon still accelerates because
• A) these forces are not an action-reaction pair.
• B) the wagon is not alive.
• C) the wagon does not accelerate because these
forces are equal and opposite.
• D) nevertheless there is still an unbalanced force
on the wagon.

Newton Concept Review
• A car traveling at 22 m/s comes to an
abrupt halt in 0.1 second when it hits a
tree. What is the deceleration in m/s2 of
the car?
• A) -880        B) +220
• C) -220       D) +880

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