Midterm Review (Only quizzes 1-6)
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
1 kg m/s
On a balanced seesaw, a boy three times as heavy as his partner sits
1/3 the distance from the fulcrum.
A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of
10 N
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10 N
The support force on a 10-N book at rest on a table is
10 N
A 10-N block and a 1-N block lie on a horizontal frictionless table. To impart equal horizontal accelerations, we would have to push the heavier block with
10 times as much force
A bag of groceries that has a mass of 10 kilograms weighs about
100 N
When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is
1000 N
The mass of a lamb that weights 110 N is about
11 kg
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is
14 m/s.
A tree stump is pulled northward by a 10-N force at the same time a 25-N force pulls it southward. The resultant force has a magnitude of
15 N
A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?
2 m/s^2
When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance of
20m
The speed of a 4-kg ball with a momentum of 12 kg m/s is
3 m/s
When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is
3000 N
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
4.0 m/s^2
The resultant of a 40-N force at right angles to a 30-N force is
50 N
Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of
500 N
What is the force of gravity on a 500-N woman standing on Earth's surface?
500 N
A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of
6 m/s
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is
6 m/s
If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is
6 m/s^2
At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is
60 m/s
The safest way to view an image of the Sun is to use
A pinhole
Which has zero acceleration? An object
All of the above (in mechanical equilibrium, at rest, moving at a constant velocity)
A vehicle undergoes acceleration when it
All of the above (loses speed, changes direction, gains speed)
A moving object has
All of these (velocity, momentum, speed, energy)
As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the
Ball's pull on Earth
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?
Both forces are the same
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
Both the same
Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed?
Both the same
The bob of a simple pendulum has its maximum kinetic energy at the
Bottom of its swing
Toss a baseball bat into the air and it wobbles about its
Center of mass
The first scientist to be credited for postulating that Earth circled the Sun was
Copernicus
If all people, animals, trains and trucks all over the world began to walk or run towards the east (opposite the direction of Earth's spin), then
Earth would spin a bit slower.
A roller skate at rest may have
Energy
The work you do when pushing a shopping cart twice as far while applying twice the force is
Four times as much
The first scientist to introduce the concept of inertia was
Galileo
A hockey puck sliding at constant velocity across the ice is
In equilibrium
If an object's mass is decreasing while a constant force is applied to the object, the acceleration
Increases
When a twirling ice skater brings her arms inward, her rotational speed
Increases
An object with twice as much mass as another object has twice as much
Inertia
For every action force, there must be a reaction force that
Is equal in magnitude
A rock is thrown vertically into the air. At the top of its path the net force on it is
Mg
A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
Momentum
If an all-electric car has kinetic energy, then it also must have
Momentum
A golf ball is thrown at and bounces backward from a massive bowling ball that is initially at rest. After the collision, compared to the golf ball, the bowling ball has more
Momentum, but less kinetic energy
Which of these animals has a quicker stride?
Mouse
Horses with the greatest linear speed on a merry-go-round are located
Near the outside
While a car travels around a circular track at a constant speed, its
None of the above (inertia is zero, velocity is zero, acceleration is zero)
Which of the following is a vector quantity?
None of the above (mass, volume, area)
When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy
Of 40 J
A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, its maximum acceleration is
One half
If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would
Quadruple
The accelerations possible for a ball on an inclined plane
Range from zero to g
Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity
Remains constant
When wind encounters a wind turbine that produces energy, wind speed on the downside of the blades is
Slowed
The main reason a person weighs less at the equator than at the poles involves the
Spin of the Earth
A ball rolling down an incline has its maximum kinetic energy at
The bottom
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 the ground first?
The heavy man
An automobile and a golf cart traveling at the same speed collide head-on. The impact force is
The same for both
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
Twice
Relative to an initial height, an object raised twice as high has a gravitational potential energy
Twice as much
The work you do when pushing a shopping cart a given distance while applying twice as much force is
Twice as much
The work you do when pushing a shopping cart twice as far while applying the same force is
Twice as much
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
Volkswagen
Inside a freely-falling elevator, you would have no
Weight
If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in
a straight-line path.
A theory in the field of science is
a synthesis of a large body of well-tested knowledge
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
Recall Galileo's Leaning Tower experiment. With negligible air resistance, a heavy and a light object fall
all of the above (with equal accelerations, to the ground in equal times, with the same increases in speed)
Which of the following involves passion, talent, and intelligence?
all of the above( music, science, art, literature)
Science, art, and religion normally need not contradict one another because
all three involve different domains.
Action and reaction pairs of forces
always act simultaneously
A karate chop is more effective if one's hand
bounces upon impact
Which of the following is a scientific statement?
candy Bon Bons contain no sugar
The center of mass of a human body is located at a point that
changes as a person bends over
The bob of a conical pendulum swings in a
circular path
The two measurements necessary for calculating average speed are
distance and time.
The force that propels a cannonball when fired from a cannon is
equal and opposite to the force the ball exerts on the cannon
If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object
eventually slides to a stop.
When a rocket forces exhaust gases downward, the exhaust gases
exert an upward force on the rocket.
Science later greatly advanced when Galileo favored
experiment over philosophical discussions
Pseudoscience is best characterized as being
fake
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
follow a straight-line path
A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
force that the ball exerts on the bat.
Science and technology are
fundamentally different from each other
When a dishonest scientist reports false information, he or she
gets no second chance in the scientific community
Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The magnitude of momentum for the combined wreck is
greater than the magnitude of momentum of either car before collision.
An educated scientific guess is a
hypothesis
Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter
lengthened time of contact.
A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat
moves in the direction of the wind impact force
The amount of gravitational force that acts on a space vehicle while in Earth orbit is
nearly as much as the vehicle's weight on Earth's surface
The most basic of the sciences of physics, chemistry, and biology is
physics
Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
stopping time is longer on the carpet
Planets wobble in their orbits due to
the gravitational attraction to other planets.
A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass?
the one on the Moon
A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is
the same as the force applied to the block.
Your weight is the force
you exert against a supporting surface.
