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Physics Fall Semester Exam
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One object has twice as much mass as another object. The first object also has twice as much __________.
Suppose we observe light bouncing back and forth between two vertical clock mirrors in a spaceship that is whizzing past us at a very high speed. Compared to what the person in the spaceship sees, we see the spaceship clock as running __________.
just the same
Potential energy is the energy an object has because of its __________.
When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on the earth's surface? All values in meters per second squared
A high school student hits a nail with a hammer. During the collision, there is a force __________.
on the hammer but not on the nail
on the nail but not on the hammer
on th nail and also on the hammer
Which has greater kinetic energy, a car traveling at 30km/hr or a half-as-massive car traveling at 60 km/hr?
the 60km/hr car
the 30 km/hr car
the both have the same kinetic energy
The force of gravity on you is greatest when you are standing __________
just above Earth's surface
on Earth's surface
just below Earth's surface
How much work is done on a 50-N rock that you lift 10 m?
The principal of Waxahachie High School is?
What is the resultant force when adding a 3N force to an 15N force?
After a cannon ball is fired into frictionless space, the amount of force needed to keep it going equals __________.
zero, since no force is necessary to keep it moving.
one quarter the force with which it was fired.
twice the force with which it was fired.
the same amount of force with which it was fired.
A person is attracted towards the center of the earth by a 500 N gravitational force. The force with which the earth is attracted toward the person is __________.
very very large.
very very small.
A 10N force and a 30N force act on an object in opposite directions. What is the net force on the object?
A car has a mass of 1000 kg and accelerates 2 meters per second squared. What is the magnitude of the force acting on the car?
If the mass of Earth increased, with no change in radius, your weight would __________.
stay the same
How much does a 1kg bag of nails weigh?
As a pendulum swings back and forth ______________.
Kinetic energy is transformed into potential energy
at the lowest part of its swing, its energy is all kinetic
at the end points (highest point) of its swing, its energy is all potential
all of the above
A ball is thrown straight up. At the top of its path its instantaneous speed is __________.
about 10 m/s
about 20 m/s
about 5 m/s
Which of the following would NOT be considered a projectile?
A cannonball rolling off the edge of a table
A cannonball thrown through the air
A cannonball rolling down a slope
A cannonball thrown straight up
Compared to its mass on earth, the mass of a ? object on the moon is __________.
If the force of gravity suddenly stopped acting on the planets, they would __________.
fly straight away from the sun
move in straight lines tangent to their orbits
spiral slowly away from the sun
spiral slowly towards the sun
Kinetic energy of an object is equal to __________.
one half the product of its mass times its speed squared.
its mass multiplied by its acceleration.
its mass multiplied by its speed.
its mass multiplied by its acceleration squared.
A block is at rest on an incline. The force of friction necessary to prevent the block from sliding increases when the incline angle is __________.
Force of friction stays the same, neither.
Newton reasoned that the gravitational attraction between Earth and the moon must be __________.
the same at all distances
reduced by distance
not changed by the distance
independent of distance
A tin can whirled on the end of a string moves in a circle because __________.
once the can starts moving, that is its natural tendency
there is no force on the can pulling it outward
the can continually pulls on the string
there is an inward force acting on the can
According to the well-known equation "energy equals mass times the speed of light squared," __________.
energy is actually mass traveling at the speed of light squared
mass and energy travel at the speed of light squared
mass and energy travel at twice the speed of light
mass and energy are related
When you look at the speedometer in a moving car, you can see the car's __________.
average distance traveled.
How much power is required to do 100J of work on an object in 2 seconds?
An archer shoots an arrow. Consider the action force to be the bow string against the arrow. The reaction to this force is the __________.
air resistance against the bow
friction of the ground against the archer's fet
arrow's push against the bowstring
grip of th archer's hand on th bow
Ten seconds after starting from rest, a car is moving at 40m/s. What is the car's average acceleration? All answers in meters per second squared.
A cannon with a barrel velocity of 100m/s launches a cannonball horizontally from a tower. Neglecting air resistance, where will the cannonball be 1 second later?
In the absence of air resistance, objects fall at constant __________.
To calculate how much stored energy an object contains at a certain height, you multiply ________________.
mass times its accleration due to gravity
mass times its velocity squared
mass times its accleration due to gravity times its height
mass times its velocity
When working with electricity, you should?
Not wear any shoes
keep excess papers and supplies on the work bench
Wet your hands
Keep the work area clear of extra moisture and damaged electrical cords
Power is defined as __________________.
distance divided by the time taken to move that distance.
work done times the time taken to do that work.
work done on an object divided by the time taken to do the work.
force on an object divided by the time the force acts.
An object that has kinetic energy must be __________.
A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force?
The grip of the player's hand against the bat
The weight of the ball
Air resistance on the ball
The force of the ball against the bat
What color are the walls?
If you drop a feather and a coin at the same time, negating air resistance, which will reach the bottom of the tube first?
Both hit the same time
How many joules of work are done on an object when a force of 10N pushes it 5M?
A 10N force and a 30N force act in the same direction on an object. What is the net force on the object?
A hypothesis is __________.
close agreement by competent observers of observations of the same phenomena.
an educated guess that has yet to be proven by experiment
the long side of a right triangle.
a guess that has been tested over and over again and always found to be true.
Which one of the following steps is NOT a part of the scientific method?
Recognize a problem
Make a guess about the answer and predict its consequences.
Collect precise data during experimentation.
Make up data if the data does not match your predictions
How much work is done on a 50 N rock that you carry horizontally across a 10 m room?
At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height Which ball hits the ground first?
Neither they both hit the ground at the same time
the horizontally thrown ball
the dropped ball
In physics, work is defined as __________.
force times distance
force divided by time
distance divided by time
force times time
Two objects move toward each other because of gravitational attraction. As the objects get closer and closer, the force between them __________.
A table cloth can be withdrawn from under a stack of plates without toppling it if the table cloth is jerked quickly. The reason this can be done is that __________.
the plates have very little weight.
the plates have inertia.
gravity pulls very hard on the plates.
there is an action-reaction pair operating.
a measure of how fase something is moving
all of the above
distance covered per unit time.
always measured in terms of a unit of distance divided by a unit of time.
In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves.
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