PHYS 1001 #2
Galileo said that if you rolled a ball along a level surface it would a)slow down b)keep rolling c)roll in opposite
keep rolling
Galileo said that if you rolled a ball along a level surface it would a)keep rolling without slowing down if no friction acted upon it. b)eventually roll in the opposite direction c)roll as long as its inertia nudged it along d)slow down due to its natural tendency to come to rest.
keep rolling without slowing
According to Newton, the greater the distance between gravitationally interacting objects, the a)constancy of the force between them b)less the gravational force between them
less the gravational force between them
Consider a space probe three times as far from Earth's center as it would be at Earth's surface. Compared to at Earth's surface, its gravitational attraction to Earth at this distance is about a) one third as much b)zero c)one ninth as much
one ninth as much
A baseball weighs 1.5 N on Earth. Another type of ball weighs 1.5 N on the Moon. The ball with the greater mass is the a)same b)baseball c)other type
other type
A baseball weighs 1.5 N on Earth. Another type of ball weighs 1.5 N on the Moon. The ball with the greater mass is the a)baseball b)other type of ball c)same for each d)not enough info
other type of ball
A "weightless" astronaut in an orbiting space vehicle is a) shielded from Earth's gravational effects b)without a support force c)beyond the pull of gravity
without a support force
An object in motion tends to remain in motion a)without the need of force b)only when an external force acts on it c)due to their nature d)because of a force inside the object
without the need of a force
The net force on any object moving at constant velocity is a)zero b)less than its weight c)10 meters per second squared d)equal to its weight.
zero
Using the formula for gravity, find the force of gravity on a 1.4-kg mass at Earth's surface. (The mass of Earth is 6×1024kg, and its radius is 6.4×106m.).
14N
A tow truck exerts a force of 3000 N on a car that accelerates at 2 m/s2. What is the mass of the car? a)1500 kg b)500 kg c)3000 kg d)1000 kg
1500kg
A rocket of mass 120000 kg undergoes an acceleration of 2.4 m/s2 .
2.9 x 10^5 N
If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in a)a curved path b)an inward spiral path c)an outward spiral path d)a straight line path
a straight line path
If the mass of an object does not change, a constant net force on the object produces constant a)acceleration b)velocity. c)both of these d)none of the above
acceleration
If the mass of an object does not change, a constant net force on the object produces constant a)constant b)velocity c)both of these
acceleration
Which has zero acceleration? a)object at rest b)object in mechanical equal c)object moving at constant velocity d)all
all
If Earth's mass somehow doubles with no change in its size, and your mass remains the same, your weight a)quadrupled b)also doubles
also doubles
Knowledge can be gained by philosophical logic and also by experimentation. Which of these did Aristotle favor, and which did Galileo favor? a)aristotle favored logic b)aristotle favored experiment c)both favored logic
aristotle favored logic
Which has the greatest mass? a)automobile battery b)a fluffed up king size pillow c)a scrunched up king size pillow
automobile battery
When Galileo rolled a ball down an incline and up another incline, he found that the ball rolled nearly to a)3/4 b)initial height c)higher d)halfway
initial height
A ball is thrown vertically upward. At the top of its vertical path, its velocity is a)greater than 10m/s b)10m/s c)0 m/s d)between 0 m/s and 10m/s
0 m/s
When a baseball player hits a ball with a force of 1000 N, the ball exerts a force on the bat of a)1000N b)less than 1000N c)more than 1000N
1000N
A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weight there? a)zero b)100 N c)200N d)400N
100N
In the textbook we learn that the cause of acceleration is given by Newton's second law: a=Fnet/m. Find the acceleration that can result from a net force of 12 N exerted on a 2.6-kg cart. (Note: The unit N/kg is equivalent to m/s2.).
4.6 m/s2
With no air resistance, a projectile fired at 50° has the same range as if it were fired at a)60 b)45 c)40
40
In the textbook acceleration is defined as a=Δv/Δt. Use this formula to find the acceleration of a cart on an inclined plane that gains 7.0 m/s each 1.3 s .
54 m/s2
When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west with 15 N, the combination of these forces on the block is a)5N east b)35N west c)5N west
5N east
Calculate the horizontal force that must be applied to a 0.60-kg puck to accelerate on a horizontal friction-free air table with the same acceleration it would have if it were dropped and fell freely.
6.0 N
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? a)the force on A b)the force on B c)both forces on each other are the same
both forces
To steadily (constantly) increase the velocity of something requires a a)steadily increasing force b)decreasing force c)constant net force
constant net force
To steadily (constantly) increase the velocity of something requires a a)steadily increasing force b)decreasing force c)constant net force d)none of the above
constant net force
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity a)decreases b)increases c)remains unchanged
decreases
A given net force propels an object along a straight-line path. If the net force were doubled, its acceleration would a)stay the same b)double c)quadrouple d)be half
double
A space probe in remote outer space continues moving a)curved path b) because some kind of force acts on it c)due to gravity d)even though no force acts on it
even though no force acts on it
A space probe in remote outer space continues moving a)in curved path b)because some kind of force acts on it c)even though no force acts on it
even though no force acts on it
Science greatly advanced when Galileo favored a)non-mathical thinking b)experiment c)philosophical discussions
experiment
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the rock tends to a)spiral inward b)follow a straight line path c)fall straight downward d)continue in a circular path
follow a straightline path
How far must one travel to completely be beyond Earth's gravity? a) to a region above the earth's atmosphere b)to a region well beyond the moon c)forget it, you cant travel that far
forget it
According to Newton, the greater the masses of interacting objects, the a)greater the force b/t them by square of the masses b)greater the gravational force b/t them c)greater the force between them by square of the distance
greater the gravational force between them
As a bowling ball that rolls off the edge of a table falls, its horizontal component of motion a)decreases b)remain constant c)increases
remains constant
Newton discovered a)gravity b)that gravity is universal c)neither
that gravity is universal
Consider a space pod somewhere between Earth and the Moon, at just the right distance so that the gravitational attractions to Earth and the Moon are equal. Is this location nearer Earth or the Moon?
the moon
An object at rest cannot remain at rest unless which of the following holds? a)The net force acting on it is zero b)The net force acting on it is constant and nonzero c)There are no forces at all acting on it d)There is only one force acting on it.
the net force acting on its zero
Compared with the mass of an apple on Earth, the mass of the same apple on the Moon is a)less b)the same c)more
the same
Consider two planets in space that gravitationally attract each other. If the mass of one planet is doubled, and the distance between them doesn't change, then the force between them is a)half as much b)four times as much c)one quarter d)twice as much
twice a much
