Physics Review Ch 1-8 and 10

An apple weighs 1 N. When held at rest above your head, the net force on the apple is a. 0 N b. 0.1 N c. 1 N d. 9.8 N e. none of thes

0 N

An Apple at rest weights 1 N. The net force on the apple when it is in free fall is a. 0 N b. 0.1 N c. 1 N d. 9.8 N e. none of these

1 N

A 1 kg chunk of putty moving at 1 m/s collides with and sticks to a 5 kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of a. 0 kg m/s b. 1 kg m/s c. 2 kg m/s d. 5 kg m/s e. more than 5 kg m/s

1 kg m/s

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is a. more than 10 N b. less than 10 N c. 10 N

10 N

If a free falling object were somehow equipped with a speedometer, its speed reading would increase each second by about a. 5 m/s b. 10 m/s c. 15 m/s d. a variable amount e. depends on its initial speed

10 m/s

A machine puts out 100 Watts of power for every 1000 Watts put into it. The efficiency of the machine is a. 10% b. 50% c. 90% d. 110% e. none of these

10%

A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10s? a. 2 m b. 10 m c. 40 m d. 100 m e. 200 m

100 m

An object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s^2. After 5 seconds, the object will have a speed of a. 5 m/s b. 10 m/s c. 20 m/s d. 50 m/s e. 100 m/s

100 m/s

A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s? a. 2 seconds b. 15 seconds c. 30 seconds d. 60 seconds e. none of these

15 seconds

A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass? a. 4 kg b. 12 kg c. 16 kg d. 144 kg e. none of these

16 kg

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? a. 0.25 b. 1 c. 2 d. 4 e. none of these

2

A 2 kg mass has 40 J of potential energy with respect to the ground. Approximately how high is it above the ground? a. 1 m b. 2 m c. 3 m d. 4 m e. none of these

2 m

The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is a. 1 m/s b. 2 m/s c. 3 m/s d. 3.14 m/s e. 6.28 m/s

2 m/s

A horse gallops a distance of 10 km in a time of 30 min. It's average speed is a. 15 km/h b. 20 km/h c. 30 km/h d. 40 km/h

20 km/h

A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? a. 3 m/s b. 4 m/s c. 12 m/s d. 48 m/s e. none of these

3 m/s

a 300 kg bear grasping a vertical tree slides down a constant velocity. The friction force between the tree and the bear is a. 30 N b. 300 N c. 3000 N d. more than 3000 N

3000 N

If a rocket initally at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be a. 50 m/s b. 500 m/s c. 3000 m/s d. 3600 m/s

3000 m/s

At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately a. 40 m/s b. 50 m/s c. 55 m/s d. 60 m/s

40 m/s

A man weighing 800N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales.The reading on each scale is a. 200N b. 400N c. 800Kg d. 800N

400N

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is a. 0 N b. 5 N c. 25 N d. 150 N

5 N

A 10 N falling object encounters 4 N of air resistance. The net force on the object is a. 0 N b. 4 N c. 6 N d. 10 N e. none of these

6 N

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is a. 3 km/h/s b. 6 km/h/s c. 10 km/h/s d. 60 km/h/s e. 600 km/h/s

6 km/h/s

The scientists to first introduce the concept of inertia was a. Aristotle b. Galileo c. Newton d. Copernicus

Galileo

A dropped ball gains speed because a. its velocity changes b. a gravitational force acts on it c. of inertia d. its nature is to become closer to Earth

a gravitational force acts on it

A skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of a. about 0.2 g b. about 0.3 g c. about 0.4 g d. about 0.5 g e. more than 0.5 g

about 0.5 g

It takes about 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft? a. about 60 m b. about 120 m c. about 180 m d. more than 200 m

about 180 m

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 a. zero b. less than 30 m/s c. about 30 m/s d. more than 30 m/s e. more information is needed for an estimate

about 30 m/s

The rotational inertia of a pencil is greatest about an axis a. along its length, where the lead is b. about its midpoint, like a propeller c. about its end, like a pendulum

about its end, like a pendulum

compared to a 1 kg block of solid iron, a 2 kg block of solid has twice as much a. inertia b. mass c. volume d. all of these e. none of these.

all of these

which has zero acceleration? An object a. at rest b. moving at constant velocity c. in mechanical equilibrium d. all of these e. none of these

all of these

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

all three have different domains

Earth satellites are typically more than 100 km high so as to be above Earth's a. atmosphere b. gravitational field c. both of these

atmosphere

Which of these has its center of mass where no mass exists? a. baseball b. golf ball c. basketball d. none of the above

basketball

A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the a. rolling ball b. dropped ball c. both hit at the same time

both hit at the same time

If an object moves with constant acceleration, its velocity must a. be constant b. change by the same amount each second c. change by varying amounts depending on its speed d. always decrease

change by the same amount each second

A coin and a ring of same diameter roll down an incline at the same time. The one to first reach the bottom is the a. ring b. coin c. both reach the bottom at the same time

coin

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 with a a. magnifying glass b. coin c. telescope d. meter stick

coin

When bullets are fired from an airplane in the forward direction, the momentum of the airplane will be a. decreased b. unchanged c. increased

decreased

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity a. increases b. remains unchanged c. decreases

decreases

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always a. in the direction of motion b. opposite its velocity c. directed upward d. directed downward

directed downward

The net force exerted on a car traveling in a circular path at constant speed is a. directed forward, in the direction of travel b. directed toward the center of the curve c. zero because the car is not accelerating d. none of the above

directed toward the center of the curve

The two measurements necessary for calculating average speed are a. acceleration and time b. velocity and time c. distance and time d. distance and acceleration e. velocity and distance

distance and time

whereas impulse involves the time that a force acts, work involves the a. distance that a force acts b. time and distance that a force produces c. acceleration that a force produces

distance that a force acts

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 a. continue to follow a circular path b. follow a straight-line path c. increase its speed d. revolve in a smaller circle

follow a straight-line path

The newton is a unit of a. force b. mass c. density d. inertia

force

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 a. air resistance b. weight of the ball c. force that the ball exerts on the bat d. grip of the player's hand against the ball e. weight of the bat

force that the ball exerts on the bat

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

fundamentally different from each other

When a falling object has reached its terminal velocity, its acceleration is a. constant b. zero c. g

g

A ball is tossed upward. Neglecting air drag, the acceleration along its path is a. 0 g b. g downward c. g upward d. g upward, then g downward e. none of the above

g downward

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is a. greater b. smaller c. the same

greater

A coconut and a feather fall from a tree through the air to the ground below. The amount of air resistance force is a. greater on the coconut b. greater on the feather c. the same on each

greater on the coconut

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. quadruples b. doubles c. stays the same d. halves e. none of these

halves

In science, an educated guess is a a. hypothesis b. theory c. both of these

hypothesis

A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force experienced by her hand is a. zero b. less than the force applied to the cement block c. identical to the force applied to the block d. more than the force applied to the block e. impossible to predict without additional information

identical to the force applied to the block

Padded dashboards in cars are safer in an accident than non-padded ones because an occupant hitting the dash has a. increased time of impact b. decreased time of impact c. decreased impulse d. increased momentum

increased time of impact

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension a. increases b. decreases c. remains the same

increases

If an object's mass is decreasing while a constant force is applied to the object, the acceleration a. decreases b. increases c. remains the same

increases

When a twirling ice skater brings her arms inward, her rotational speed a. decreases b. remains the same c. increases

increases

An object may have potential energy because of its a. speed b. acceleration c. momentum d. location e. none of these

location

When you are in the way of a fast-moving object and can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a a. long time b. short time c. same way either way

long time

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

magnitude and direction

If the speed of a moving object doubles, which of the following also doubles? a. momentum b. kinetic energy c. acceleration d. all of the above

momentum

Twelve seconds after starting from rest, an object falling freely will have a speed of a. 10 m/s b. 50 m/s c. 100 m/s d. more than 100 m/s

more than 100 m/s

An object's weight may properly be expressed in units of a. meters b. kilograms c. newtons d. cubic centimeters

newtons

A ball rolled along a horizontal surface maintains a constant speed because a. its velocity remains constant b. no horizontal force acts on it c. of inertia

no horizontal force acts on it

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

no longer accelerates.

While a car travels around a circular track at a constant speed, its a. acceleration is zero b. velocity is zero c. inertia is zero d. none of the above

none of the above

Compared to a 1 kg block of solid iron, a 2 kg block of solid iron has the same a. mass b. volume c. weight d. all of these e. none of these

none of these

Which horse moves faster in m/s on the merry-go-round? a. one near inner rail b. one near outer rail c. both move at the same speed in m/s

one near outer rail

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

physics

A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of a. energy b. power c. effort d. none of these

power

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity a. increases b. remains unchanged d. decreases

remains unchanged

The force exerted on the tires of a car to directly accelerate it along a rode is exerted by the a. engine b. tires c. air d. road e. one of these

road

When railroad tracks make a curve, the outer track is longer. This means a wheel that rides on the outer track needs to somehow a. roll slower than the wheel on the inner track b. maintain the same speed as the wheel on the inner track c. roll faster than the wheel on the inner track

roll faster than the wheel on the inner track

which has a greater kinetic energy, a car traveling at 30 km/h or a car of half the mass traveling at 60 km/hr? a. the 30 km/hr car b. the 60 km/hr car c. both have the same kinetic energy d more information is needed about the distance traveled.

the 60 km/hr car

A sheet of paper can be withdrawn from under a container of milk without toppling if the paper is jerked quickly, this test demonstrates that a. the milk carton has no acceleration b. there is an action-reaction pair of forces c. gravity tends to hold the milk carton secure d. the milk carton has inertia e. none of these

the milk carton has inertia

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

the one on the moon

If you push an object twice as far while applying the same force, you do a. twice as much work b. four times as much work c. the same amount of work d. half as much work

twice as much work

While an object near the Earth's surface is in free fall, its a. velocity increases b. acceleration increases c. mass increases d. mass decreases

velocity increases

Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed to do this job was a. 20 W b. 50 W c. 100 W d. 1000 W e. 20,000 W

50 W

Compared with a force, a torque involves a. rotation b. leverage c. distance from an axis of rotation d. all of the above

all of the above

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. non of the above choices are correct

all of the above choices are correct

A car traveling along the highway needs a certain amount of force exerted on it to stop it in a certain distance. More stopping force is required when the car has a. more mass b. more momentum c. less stopping distance d. all of these e. none of these

all of these

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

all of these

The force on an apple hitting the ground depends upon a. the speed of the apple just before it hits b. the time of impact with the ground c. whether or not the apple bounces d. all of these

all of these

When a rifle is fired, it recoils as the bullet is set in motion. The rifle and bullet ideally acquire equal a .but opposite amounts of momentum b. amounts of kinetic energy c. both of these d. neither of these

but opposite amounts of momentum

Communications and weather satellites always appear at the same place in the sky, because these satellites are a. beyond the pull of Earth's gravitational field b. moving at a speed just short of escape velocity c. orbiting Earth with a 24 hr period d. stationary in space e. none of the above

orbiting Earth with a 24 hr period

As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and a. rotates slower b. rotates at the same speed c. rotates faster d. cannot rotate

rotates faster

Two factors that greatly affect air resistance on falling objects are a. size and mass of the object b. size and weight of the object c. size and speed of the object

size and mass of the object

Galileo's use of inclined planes allowed him to effectively a. slow down the acceleration of free fall b. increase the acceleration beyond that of free fall c. eliminate the acceleration of free fall d. eliminate friction

slow down the acceleration of free fall

Compared to falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the a. carpeted floor provides a smaller impulse b. stopping time is shorter on the carpet c. stopping time is longer on the carpet d. carpet provides a smaller impulse and a longer time.

stopping time is longer on the carpet

Consider a heavy and light person skydiving together with same-size parachutes from the same altitude. Who will reach the ground first? a. The light person b. the heavy person c. both will reach at the same time d. not enough information

the heavy person

Drop a rock from a 5 m height and it accelerates at 10 m/s^2 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 a. half as much b. the same amount c. twice as much d. four times as much

the same amount

Planets would crash into the Sun if it weren't for a. their tangential velocities b. their vast distances from the sun c. the inverse-square law d. their relatively small masses e. the fact that they are beyond the main gravitation of the sun

their tangential velocities

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

theory

To catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because the a. force of impact is reduced b. relative velocity is less c. time of impact is increased d. time of impact is decreased e. none of these

time of impact is increased

An object lifted 10 meter gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is a. half as much b. the same c. twice as much d. four times as much e. more than four times as muh

twice as much

If you find that twice as much work is needed to perform a task but it takes twice as much time, the amount of power required is a. twice as much b. four times as much c. sixteen times as much d. unchanged

unchanged

When a rock thrown straight upwards gets to the exact top of its path, its a. velocity is zero and its acceleration is zero b. velocity is zero and its acceleration is about 10 m/s^2 c. velocity is about 10 m/s and its acceleration is zero d. velocity is about 10 m/s and its acceleration is about 10 m/s^2 e. none of these

velocity is zero and its acceleration is about 10 m/s^2

Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be a. zero b. the same as before c. small, but noticeable

zero