Physical Science Exam
When a 1-Newton orange is held at rest above your head, the net force on the orange is
0 Newton
When a 1-Newton orange is dropped and freely falls, the net force on the orange is
1-Newton
In a moment of dozing while driving in a car at 50 km/h, you bump into a car ahead traveling at 48 km/h in the same direction. The speed of impact is(subtract)
2 km/h
A 20-Newton horizontal force applied to a 10-kg block produces acceleration across a friction-free horizontal surface of
2 m/s square
A commercial airplane has a mass of 5000 kg. During takeoff, the thrust of its engine is 10,000 Newton, producing an acceleration of
2 m/s square
a horse gallops 10 km in 30 minutes with an average speed of(per 30 minutes)
20 km/h
A 1000-kg accelerates at 2 m/s square. What is the net force exerted on it?
2000 Newton
A 2000 Newtons bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
2000 Newtons
Janet pulls a 10-kg cart with a constant force of 30 Newtons. The acceleration of the cart is
3.0 m/s square
When a 500-Newton parachutist opens her chute and experiences 800 Newton of air resistance, the net force on her is
300 Newton upward
Jean, who weighs 800 Newtons, stands at rest on two bathroom scales in such a way that one scale reads 500 Newtons. The other scale reads
300 Newtons
An object is pulled with three forces: one at 200 Newton to the right, another at 400 Newton to the right, and the third at 300 Newtons to the left. The net force is(subtract)
300 Newtons to the right
Daisy's average speed when running a distance of 2 km in a one-half hour is (per 30 minutes)
4 km/h
A 800-Newtons man stands at rest with his weight evenly distributed on a pair of weighing scales. The tension in each strand equals(half it)
400 Newtons
Burl and Paul have a total weight of 1300 Newton. The tensions in the supporting ropes of the scaffold they stand on add to 1700 Newtons. The weight of the scaffold itself must be(subtract)
400 Newtons
A cart is pushed to the right by a 10-Newton force. At the same time, a boy pushes it to the left with a 5-Newton force. The net force exerted on the cart is(subtract)
5 Newtons to the right
When Mike sprints 100 yards in 20 seconds, his average running speed is(v=d divided by T)
5 yards/second
When 100-Newton object is suspended at rest by two equally taut vertical strands of rope, the tension in each strand is (half it)
50 Newtons
When a 100-kg block is simultaneously pushed toward the east with 200 Newtons and toward the west with 150 Newtons, the combination of these forces on the block is(subtract)
50 Newtons east
A 100-Newton falling object encounters 40 Newtons of air resistance. The net force on it is (subtract)
60 Newtons
Six seconds after starting from rest, a skydiver in free fall has a speed of(10 m/s every second)
60 m/s
A 1-kg block of iron has a weight of
9.8 Newtons
Which object has zero acceleration
An object moving at constant velocity, object at rest, and object in mechanical equilibrium
Having to choose between science and religion is unnecessary
Because both operate in different realms
The first to be credited for Earth circling the Sun was
Copernicus
Ancient Greek investigators discovered
Earth's circumference, that Earth rotates daily, and why things float
In a less systematic way, many discoveries are found by
Experimenting with guessing, accidental discovery, and trial and erro
Science and technology are
Fundamentally differnent from each other
The first scientist to be credited for discovering the concept of inertia was
Galileo
Friction is common in
Gases, solids, and liquids
A moving probe in space continues in its motion due to
Its own inertia
The classic scientific method includes
Observing carefully, questioning, and predicting
Among those who charted the stars and planets in ancient time were
Polynesians and Chinese
Who spread the knowledge of the Ancient Greeks?
Romans
The most important element in Eratosthenes' calculation of Earth's size was that the angle
Simultaneous
Which of these is a scientific hypothesis
The dumpster in your back alley is filled with garbage
Which of these questions lies outside the realm of science?
What is the nature of the human spirit and what is the purpose of life?
A rocket's acceleration increases when traveling upward from the ground due to
a decrease in mass as fuel is burned and ejected
In science a theory is
a synthesis of a large body of well-tested knowledge
A scientific hypothesis is
a testable educated guess
A constant net force on a moving van produces a constant
acceleration
If the mass of an object remains unchanged, a constant net force on it produces a constant
acceleration
Newton's second law focuses on
acceleration
Hudson stands at rest on a pair of bathroom scales. The scale readings will always
add to equal his weight
Burl carries Paul piggyback while standing in the Middle of a scaffold. The tensions in the two supporting ropes
are equal
An apple and a pea at rest are simultaneously dropped in a vacuum. The apple falls to the ground
at the same time as the pea
When you leap straight upward inside a high-speed train traveling at constant velocity, you land
at your original position
A heavy ball hangs by a string, with a second string attached to its bottom. A quick pull on the bottom string breaks the
bottom string
When rubbing your hands together, you
cannot push harder on one hand than the other hand
As Suzy's velocity increases when she skydives, her acceleration
decreases
A ball tossed vertically upward reaches its highest point and then falls back to its starting point. Along this up-and-down path, the acceleration of the ball is always
directed downward
A space probe flying in remote outer space continues travelling
even if no force acts on it
According to Galileo, the test of scientific truth is
experiment
In contrast to Aristotle's statements about nature, Galileo's reliance was on
experiment
Correct Science is mainly linked to
experimentation
A scientific idea that is well established and unquestionable is a
fact of nature
According to Galileo, a rolled ball eventually comes to a stop because
friction
When a cheating scientist reports fraudulent information, he or she
gets no second chance in the scientific community
When a cannon fires a cannonball, both cannon and ball undergo acceleration that is
greater for the cannonball
The support force acting on a 9-Newton book resting on horizontal surface is
greater than 9 Newtons
The focus of equations in this is
guides to thinking
Nellie Newton hangs suspended at rest by two ends of a rope draped over a large pulley. The tension in each strand equals (in the middle)
half her weight
A heavy and a light ball are dropped at the same time from a high tower. The ball to reach the ground first, assuming no air resistance, will be the
heavier ball and lighter ball
When the lower string is pulled slowly in the heavy-ball-and-strings demonstration, tension
in the top string is due to your pull plus the weight of the ball
Dad stands at rest on kitchen floor. When son Hudson is given a piggyback ride, the support force beneath Dad
increases
When you push a brick with twice as much force, the acceleration of the brick
increases
An object having twice as much mass as another objects also has twice as much
inertia
A given net force accelerates a cart along a straight-line path. If the mass of the cart somehow doubles, its acceleration
is half
You toss a ball upward. After it leaves your hand, your applied force
is zero
Pseudoscience is a field of
junk science
Galileo stated that a ball rolled along a level surface it would
keep rolling without slowing down if no friction acted upon it
A block of matter will weigh
less on the Moon
Eratosthenes would have measured a larger Earth if the distance between his pillar and the in Syene were
longer
A kilogram relates to an object's
mass
In any field of science, facts
may change
Aristotle asserted that motion was characterized by
natural motion and violent motion
The most basic of the sciences of physics, chemistry, and biology is
physics
we define inertia to be a
property of matter
Aristotle's view of natural laws is best understood by
reasoning
When Galileo dropped balls from the leaning tower of Pisa, he
refuted Aristotle's teachings which proven false
A truly educated person is knowledgeable about
religion, the arts, and science
If you leap straight up inside a high-speed train that slows down, you land
slightly ahead of your original position
An object accelerates when it
slows down, speeds up, and changes its direction of motion
Acceleration in a car can be accomplished by
speeding up, applying the brakes, and rotating the steering wheel
Eratosthenes' measurements of Earths's size involved
surveying the distance between Alexandria and Syene, a deep well in Syene, and a pillar's shadow in Alexandria
A quick pull on a sheet of paper beneath a box of crackers doesn't topple the box, best illustrates that
the box has inertia
The net force acting on an object is
the combination of all forces acting on it
As Marie pushes a table to the right, friction between the floor and the table acts toward
the left
A push of 1 Newton accelerates a 1-kg mass at 1 m/s square. A push of 2 Newton accelerates of a 2-kg mass
the same
When Ale pushes on a tree,
the tree pushes on Ale, an interaction occurs between her and the tree, and both comprise a force pair
A hockey puck slides along an icy pond. Without any kind mass or weight
this is wrong
Compared with a 2-kg block of solid iron, a 4-kg of solid iron has twice as much
volume, inertia, and mass its none of this
An object set in motion tends to remain in motion
without the need of a force
A valid hypothesis must be capable of being proved
wrong
Toss a ball vertically upward and its speed at the top of its path is
zero
When a heavy stone thrown straight up reaches the top its path, its velocity is
zero and its acceleration is 9.8 m/s square
A sports cat that maintains a constant velocity of 120 km/h for one-half hour has an acceleration of
zero because of no change in velocity