Physical Science Test 1 part 2

An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force on the object is

5 N

An object is in free-fall. At one instant, it travels at a speed of 50 m/s. Exactly 1 s later, its speed is about

60 m/s

an object travels 8 m in the first second of travel, 8 m again during the second second of travel, and 8 m again during the third second. its acceleration in meters per second per second is

0

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 : equal to the weight of the puck the mass of the puck multiplied by 10 m/s/s 0 N the weight of the puck divided by the mass of the puck

0 N

What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s?

0 m/s^2

a 1 kg mass at the Earth's surface weighs about how many newtons?

10 N

A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is: 10 times as much as the force on the 1 kg book the same as the force on the 1 kg book zero

10 times as much as the force on the 1 kg book

a baseball player bats a ball with a force of 1000 N. the ball exerts a reaction force against the bat of

1000 N

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s/s. What is the mass of the car?

1500 kg

The average speed of a horse that gallops a distance of 10 km in a time of 0.5 hours is:

20 km/h

If a baseball being thrown goes from zero to 30 m/s in 0.1 s, what is its average acceleration?

300 m/s/s

a karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is actually

3000 N

Starting from rest, the distance a freely falling object will fall in 10 s is about

500 m

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?

6 N

If a car increases its velocity from zero to 60 km/h in 10 s, its acceleration is:

6 km/h/s

A car accelerates from rest at 2 m/s/s. What is its speed 3 s after the car starts moving?

6 m/s

the weight of a 0.6 kg of salami is about ____ N.

6.0 N

Which of these statements is a scientific hypothesis? Albert Einstein was the greatest physicist of the 20th century. Space is permeated with an essence that is undetectable. Atoms are the smallest particles of matter that exist.

Atoms are the smallest particles of matter that exist.

The scientist to first introduce the concept of inertia was

Galileo

Which of Newton's laws explains why a book sits motionless on a table until a force moves it?

Newton's first law

Which of Newton's laws explains why seatbelts are necessary?

Newton's first law

Which of Newton's laws best explains the statement "Heavy objects require more force to move than lighter objects"?

Newton's second law

Which of Newton's laws explains why a tennis ball accelerates more when hit with the same force as a softball?

Newton's second law

Action/ reaction force pairs are associated with which of Newton's laws?

Newton's third law

Which of Newton's laws explains why a gun recoils when a bullet is fired from it?

Newton's third law

Which of the following is a scientific statement? The Moon is made of green cheese. Matter is filled with undetectable particles. There are things we will never know about. There are parts of the universe that will never be found by man.

The Moon is made of green cheese.

A package falls of a truck that is moving a 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is : more than 30 m/s less than 30 m/s but larger than zero more information needed for an estimate zero about 30 m/s

about 30 m/s

Compared with a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much: volume mass inertia none of these all of these

all of these

suppose you're coasting in a car at 60 km/h and apply the brakes until you slow to 40 km/h. when you suddenly release the break, the car tends to : momentarily regain its higher initial speed continue moving at 40 km/h in the absence of forces decrease in speed whether or not other forces act

continue moving at 40 km/h in the absence of forces

An object in mechanical equilibrium is an object : a. at rest. b. moving with constant velocity. c. having no acceleration. d. all of these.

d. all of these

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the

force of the ball against the bat

the scientific method is most effective in: making hypothesis making theories discovering new things gaining, organizing, and applying new knowledge performing experiments

gaining, organizing, and applying new knowledge

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 _____.

halves

One object that has twice as much mass as another object also has twice as much: inertia gravitational acceleration volume velocity

inertia

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 water: is greater for the dropped bullet is greater for the fired bullet is the same for each bullet depends on how high they started

is the same for each bullet

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 : the same as the speed it had when thrown upwards more than the speed it had when thrown upwards less than the speed it had when thrown upwards

less than the speed it had when thrown upwards

Whereas Aristotle relied on _____in explaining nature, Galileo relied on _____.

logic, experiment

A force is a vector quantity because it has both mass and acceleration magnitude and direction action and reaction counterparts

magnitude and direction

A kilogram is a measure of an object's _____.

mass

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has the same: none of these weight volume mass all of the these

none of these

While a car travels around a circular track at constant speed, its: acceleration is zero velocity is zero none of these both of these

none of these

Of the sciences known as physics, chemistry, and biology, the most basic is

physics

Two factors that greats affect air resistance on falling objects are the size and : weight of the object speed of the object mass of the object

speed of the object

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?

the light woman

a rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because: the mass of the rocket decreases as fuel is burned the applied force on the rocket increases as burning of fuel progresses gravity becomes weaker with increased distance

the mass of the rocket decreases as fuel is burned

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: there is an action-reaction pair of forces gravity tends to hold the milk carton secure the milk carton has no acceleration the milk carton has inertia

the milk carton has inertia

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass?

the one on the moon

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

the same

the synthesis of a large collection of information that contains well-tested and verified hypothesis about certain aspects of the world is known as a scientific ______.

theory

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 ______. 200 N 400 N 1600 N 800 N

400 N

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

10 m/s

Disregarding air resistance, objects fall at constant

acceleration

the two measurements necessary for calculating average speed are : velocity and distance distance and acceleration velocity and time acceleration and time distance and time

distance and time

Science and technology are : fundamentally different from each other really one and the same responsible for all the good in the world responsible for all the bad in the world

fundamentally different from each other

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

speculation

Your weight is : the same in all locations actually your mass a property of mechanical equilibrium the gravitational attraction between you and the Earth

the gravitational attraction between you and the Earth

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

zero