Physics test

A ball tossed vertically upward rises, reaches it highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

directed downward

The two measurements necessary for calculating average speed are

distance and time

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

doubled

A bullet is dropped from the top of the Empire State Building where another bullet is fired downward from the same location. Neglecting air resistance, the acceleration of

each bullet is 9.8 m/s/s

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of

(100-4.9) m

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is

0

An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is

0

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second?

4

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?

4

At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately

40 m/s

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is

400 N

An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2 meters in one second. On this planet, the rock has a weight of

5 N

One half second after starting from rest, a freely falling object will have a speed of about

5 m/s

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is

6 km/h/s

If a car accelerates from rest at 2 m/s/s, its speed 3 seconds later will be about

6 m/s

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about

60 m/s

If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be

9.8 m/s/s

Of the sciences known as physics, chemistry, and biology, the most basic is A) physics B) chemistry C) biology D) none in particular, as each may be considered fundamental

A) physics

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

about 30 m/s

A ball is thrown 125 meters upward and then falls the same distance back to Earth. Neglecting air resistance, its total time in the air is

about 10 seconds

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?

about 180 m

Starting from rest, the distance a freely falling object will fall in 0.5 second is about

1.25 m

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

10 N

An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about

10 m/s

Disregarding air drag, how fast must you toss a ball straight up in order for it to take 2 seconds to return to the level from which you tossed it?

10 m/s

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

10 m/s

A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?

100 m

An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of

100 m/s

Twelve seconds after starting from rest, an object falling freely will have a speed of

100 m/s

A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?

15 seconds

If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about

2 seconds

A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is

20 km/h

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be

20 m/s

If a freely falling object were equipped with a speedometer, its speed reading would increase each second by about

20 m/s

An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance of

250 m

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is

30 N

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is

300 N upward

If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be

3000 m/s

Science, art, and religion do not contradict one another because A) All three have different domains B) If you choose the right one, you can forget the other two C) If you choose religion and art, you can forget about science D) if you choose science, you can forget about religion and art

A) All three have different domains

Eratosthenes learned about the position of the sun on June 22 by A) consulting library information B) setting up a stick at Syene C) setting up a stick at Alexandria D) setting up sticks at both Syene and Alexandria E) None of the above choices are correct

A) Consulting library information

Which of the following is a scientific statement? A) The moon is made of green cheese B) There are things we will never know about C) Matter is filled with undetectable particles D) There are parts of the universe that will never be found by man E) none of these

A) The moon is made of green cheese

In science, an educated guess is a A) hypothesis B) theory C) both of these

A) hypothesis

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized A) Time rates B) the role of distance in describing motion C) the acceleration of free fall D) all of these E) none of these

A) time rates

While a car travels around a circular track at a constant speed, its

Around a circular track velocity is changing because its direction is changing. The accelaration is changing as well. Thus (d) is the answer. None of the above

The scientist to first introduce the concept of inertia was A) Newton B) Galileo C) Copernicus D) Aristotle

B) Galileo

The easiest way for you to measure the distance between the Earth and the moon is to place in your line of sight to the moon a A) magnifying mass B) coin C) telescope D) meter stick

B) coin

Whereas Aristotle relied on logic in explaining nature, Galileo relied on A) mathematics B) experiment C) patterns D) logic also

B) experiment

The scientific method is most effective in A) making hypotheses B) gaining, organizing, and applying new knowledge C) discovering new things D) making theories E) performing experiments

B) gaining, organizing, and applying new knowledge

When a scientist is dishonest and reports false information, he or she A) like in so many other professions, will be excused by the scientific community B) gets no second chance in the scientific community

B) gets no second chance in the scientific community

In science, facts A) are absolute B) may change C) mean very little D) are more important than theories

B) may change

The statement, "There are regions beneath the Earth's crust that will always be beyond the reach of scientific investigation," is a A) fact B) speculation C) hypothesis D) scientific statement E) theory

B) speculation

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) there is an action-reaction pair of forces B) the milk carton has inertia C) the milk carton has no acceleration D) gravity tends to hold the milk carton secure E) none of these

B) the milk carton has inertia

A scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypothesis, there must be a test for proving it A) right B) wrong

B) wrong

a light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. which person will get to a state of zero acceleration first?

Both should arrive at the same time

In science, a theory is A) an educated guess B) less than a fact C) a synthesis of a large body of well-tested knowledge D) unchangeable

C) a synthesis of a large body of well-tested knowledge

The safest way for you to view the sun is with A) a telescope B) binoculars C) pinhole images D) colored sunglasses

C) pinhole images

Science is a body of knowledge that A) describes order in nature B) is an ongoing activity of humans C) condenses knowledge into testable laws D) All of the above choices are correct E) None of the above choices are correct

D) All of the above choices are correct

A truly educated person is knowledgeable about A) science B) the arts C) religion D) all of these

D) all of these

Science and technology are A) really one and the same B) responsible for all the good in the world C) responsible for all the bad in the world D) fundamentally different from each other

D) fundamentally different from each other

The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific A) fact B) hypothesis C) law or principle D) theory E) none of these

D) theory

Which of the following involves passion, talent, and intelligence A) art B) literature C) music D) science E) all of these

E) all of these

A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is

about 30 m/s

A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds

about 50 m/s

Disregarding air resistance, objects fall at constant

acceleration

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

add up to equal your weight

Hang from a pair of gym rings and the upward support forces of the rings will always

add up to your equal weight

According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains

always have forces that oppose their motion

Which has the greater mass? A) a king-size pillow B) an automobile battery C) neither both have the same

an automobile battery

An object in mechanical equilibrium is an object

at rest, having no acceleration, moving with constant velocity

If an object moves with constant acceleration, its velocity must

change by the same amount each second

If no external forces are acting on a moving object, it will

continue moving at the same velocity

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

continue to follow a circular path

A skydiver steps from a helicopter and falls for a few seconds until terminal velocity is reached. Thereafter, until he opens his parachute, his acceleration

decreases

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

exactly below the midpoint of the ceiling

A large and a small person wish to parachute at equal terminal velocities. The larger person will have to

get a larger parachute

Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they

get farther apart

A coconut and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is

greater on the coconut

a heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the

heavy rock

In each second of fall, the distance a freely falling object will fall is

increasing

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

inersia

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in m/s/s

is 9.8

a lightweight feather slides off a table and falls through the air until it reaches the floor. during the time of its fall, its acceleration

is sometimes zero

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the warer

is the same for each bullet

a ball is thrown vertically into the air. because of air resistance, its speed when it returns to its starting level compared with its initial speed is

less

a ball is thrown vertically into the air. because of the air resistance, its time coming down compared to its time going up is

less

a ball thrown straight upward takes 10 seconds to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is

less than 5 secs

A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is always

less than the speed it had when thrown upwards

A force is a vector quantity because it has both

magnitude and direction

While an object near the Earth's surface is in free fall, its

mass increases

Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed will be

neither- they will both hit with the same speed

When a rocket ship accelerating in outer space runs out of fuel it

no longer accelerates

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

zero

two factors that greatly affect air resistance on falling objects are the

size and speed of the object

Galileo's use of inclined planes allowed him to effectively

slow down the acceleration of free fall

A feather and a coin will have equal accelerations when falling in a vacuum because

the ratio of each object's weight to its mass is the same

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about

the same

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is about

the same amount

When a rock thrown straight upwards gets to the exact top of its path, its

velocity is zero and its acceleration is about 10 meters per second per second

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

zero

When a falling object has reached its terminal velocity, its acceleration is

zero