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szymanski physics ch 6
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Gravity
Terms in this set (96)
direction
An object traveling in circular path is constantly changing...
toward the center of the curve
A car travels in a circle with constant speed. The net force on the car is directed...
center seeking force
centripetal force is also known as a....
outside horse
Which has greater linear speed, a horse near the outside a merry-go-around or a horse near the inside rail?
Neither - they both have the same angular speed
Which has greater angular speed, a horse near the outside rail of a merry-go-around or a horse near the inside rail?
outward
If you are driving, and round a sharp curve to the left at constant speed, your body leans...
revolution
Motion of an object turning around an axis outside the object is called a...
rotation
The spinning motion that takes place when an object turns around an axis located within the object is called a
angular speed
The number of rotations or revolutions per unit of time is its
true
true or false: A straight line about which rotation takes place is called an axis.
true
true or false: Any force that causes on object to move in a circular path is called a centripetal force.
true
true or false: The rotational speed of a wheel is defined as the number of rotations it makes in a unit of time.
false
true or false: If Earth were its present size but twice as massive, we would weigh less.
true
true or false: The force of attraction between two masses depends inversely on the square of the distance between the masses. Any law that has this kind of dependence on distance is called an inverse square law.
false
true or false: Gravity is the weakest universal force, but it is the most effective force over long distances.
false
true or false: The farther apart two objects are, the stronger the gravitational force.
true
true or false: The greater the mass of an object, the stronger its gravitational force.
false
true or false: Earth's gravitational force is stronger than the gravitational force of the sun.
true
true or false: A center-directed centripetal force continuously changes the direction of an object to make it move in a circle.
false
true or false: The word centripetal means "toward the outside".
false
true or false: Acceleration toward the center of a curved or circular path is called gravitational acceleration.
false
true or false: A change in the speed or direction of an object is called inertia.
true
true or false: Centrifugal force does not exist.
the product of two masses
According to Newton's law of universal gravitation, the force of attraction between two masses is directly proportional to
decreases
As the distance between two objects increases, the force of attraction between them
mass
The force of gravity increases with...
force of gravity on an object
Weight is a measure of the
Newtons
Weight can be measured in
the pull of gravity
the weight of an object varies with...
amount of matter in the object
mass varies with the
gravity
The attractive force between all objects in the universe is called
decreased
An object transported from the surface of Earth to the surface of the moon has its weight
increase
If the radius of Earth decreased, with no change in mass, your weight would
increase
If the mass of Earth increased, with no change in radius, your weight would
increases
Two objects move toward each other because of gravitational pull. As the objects get closer and closer, the force between them
8000 m
The orbital speed for a satellite orbiting very close to Earth's surface is
constant
The speed of a satellite in a circular orbit is
an ellipse
A circle is a special case of
its total energy
What remains constant for satellite in an elliptical orbit?
revolution
Motion of an object turning around an axis outside the object.
rotation
Spinning motion that takes place when an object rotates about an axis located within the object.
gravity
Force of attraction between any two masses.
rotational speed
Number of rotations or revolutions per unit of time.
centripetal force
A center directed force that causes an object to move in a curved path.
false
true or false: The oval shape of orbits followed by most satellites is called a circle
true
true or false: As comets approach the sun in their orbits, their speed increases.
true
true or false: An object that orbits another is considered a satellite.
false
true or false: The force that exists between you and Earth is correctly called as your mass.
false
true or false: An object that moves around an external axis is said to be rotating.
projectile
Once you release the ball either directly downward or horizontally, the only force acting on it is gravity. When any object is thrown in the air, it becomes
inertia
A projectile moves forward due to its
gravity
a project accelerates downward due to
curved
Gravity pulls the projectile downward as it moves forward. The combination of the two motions is a __________ path.
horizontal
Motion parallel to Earth's surface is ________motion.
vertical
Motion perpendicular to Earth's surface is __________ motion.
constant
The horizontal component of a projectile's velocity remains
changes
The vertical component of projectile's velocity ___________ with time.
independent
Each component is _____________of the other but their combined effects produce the variety of curved paths that projectiles follow.
range
The horizontal distance traveled by a projectile is called the ________.
zero
The maximum height is the height of a projectile when its vertical component of velocity is
shorter
When the effect of air resistance is significant, the range of a projectile gets
negligible
If air resistance is__________, a projectile will rise to its maximum height in the same time it takes to fall from that height to ground.
fast
An Earth's satellite is a projectile traveling _______enough to fall around Earth rather than into it.
trajectory
The path followed by a projectile is called
parabola
The curved path a projectile follows is called ___________.
magnitude
The length of a vector represents its
displacement, velocity, acceleration, momentum, force, and weight
what are the vector quantities?
length, volume, speed, mass, density, pressure, temperature, energy, work, and power
what are the scalar quantities?
does not change
For a projectile the horizontal velocity
45
At what angle does a projectile fly the farthest?
90
At which angle does a projectile fly the highest?
magnitude and direction
A vector is a quantity that has
resultant
The vector that is sum of two or more vectors is called a
entirely horizontal
A ball is thrown into the air at some angle between 10 degrees and 90 degrees. At the very top of the ball's path, its velocity is
all of the above
When velocity is represented as a vector
a. the length of the arrow represents the speed
b. the length of the arrow is drawn to a suitable scale
c. the direction of the arrow shows the direction of motion
d. all of the above
6 units
What is the minimum resultant possible when adding a 3-unit vector to an 9-unit vector?
12 units
What is the maximum resultant possible when adding a 3-unit vector to an 9-unit vector?
increases
As an object falls freely in a vacuum, its velocity
acceleration
In the absence of air resistance, objects fall at constant
true
true or false: The vector sum is called resultant.
true
true or false: The orientation of a vector shows its direction.
false
true or false: When adding two vectors at right angles, the resultant of the vectors is the algebraic sum of the two vectors.
true
true or false: Any vector can be represented by two other vectors that are at right angles to each other.
false
true or false: Mass is a vector quantity.
true
true or false: The length of a vector represents its magnitude.
false
true or false: The acceleration due to gravity at the surface of the Earth is 1m/s/s.
horizontal
The _________________velocity of a projectile is considered to be constant.
satellite
An object that falls around Earth is called a ___________.
resolution
The process of resolving a vector into components is called ________________.
projectile
An object that is thrown through the air.
average speed
Total distance divided by time.
horizontal motion
Motion parallel to Earth's surface.
vertical motion
Motion perpendicular to Earth's surface
range
The horizontal distance traveled by a projectile.
velocity
Speed in a given direction.
15 degrees
In the absence of air resistance, at what other angle will a thrown ball go to the same horizontal distance as one thrown at an angle of 75 degrees?
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