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Physics Fall Semester Exam
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1.
1 point
One object has twice as much mass as another object. The first object also has twice as much __________.
energy
velocity
gravitation acceleration
inertia
2.
1 point
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 __________.
slow
just the same
fast
3.
1 point
Potential energy is the energy an object has because of its __________.
speed
location
density
size
4.
1 point
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
50.3
9.8
5.2
20.6
5.
1 point
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
6.
1 point
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
7.
1 point
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
8.
1 point
How much work is done on a 50-N rock that you lift 10 m?
500J
1J
50J
0J
9.
1 point
The principal of Waxahachie High School is?
Mr. Obama
Scooby Do
Mr. Rodgers
Mr. Nix
10.
1 point
What is the resultant force when adding a 3N force to an 15N force?
12N
3N
15N
18N
11.
1 point
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.
12.
1 point
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.
500 N.
very very small.
13.
1 point
A 10N force and a 30N force act on an object in opposite directions. What is the net force on the object?
30N
20N
10N
40N
14.
1 point
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?
1000 N
500 N
2000 N
1500 N
15.
1 point
If the mass of Earth increased, with no change in radius, your weight would __________.
stay the same
decrease
increase also
16.
1 point
How much does a 1kg bag of nails weigh?
2.4N
9.8N
19.6N
7.2N
17.
1 point
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
18.
1 point
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
0 m/s
19.
1 point
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
20.
1 point
Compared to its mass on earth, the mass of a ? object on the moon is __________.
the same
more
less
21.
1 point
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
22.
1 point
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.
23.
1 point
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 __________.
increased
decreased
Force of friction stays the same, neither.
24.
1 point
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
25.
1 point
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
26.
1 point
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
27.
1 point
When you look at the speedometer in a moving car, you can see the car's __________.
average speed.
average acceleration.
instantaneous speed
average distance traveled.
28.
1 point
How much power is required to do 100J of work on an object in 2 seconds?
200W
0W
50W
100W
29.
1 point
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
30.
1 point
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.
2.5
40
4.0
10
31.
1 point
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?
98 m
100 m
50 m
490 m
32.
1 point
In the absence of air resistance, objects fall at constant __________.
velocity
speed.
distance
acceleration
33.
1 point
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
34.
1 point
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
35.
1 point
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.
36.
1 point
An object that has kinetic energy must be __________.
at rest
falling
elevated
moving
37.
1 point
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
38.
1 point
What color are the walls?
Red
Blue
Merigold
White
39.
1 point
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
coin
feather
40.
1 point
How many joules of work are done on an object when a force of 10N pushes it 5M?
2J
5J
1J
50J
41.
1 point
A 10N force and a 30N force act in the same direction on an object. What is the net force on the object?
30 N
10 N
40 N
20 N
42.
1 point
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.
43.
1 point
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
44.
1 point
How much work is done on a 50 N rock that you carry horizontally across a 10 m room?
50J
500J
10J
0J
45.
1 point
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
46.
1 point
In physics, work is defined as __________.
force times distance
force divided by time
distance divided by time
force times time
47.
1 point
Two objects move toward each other because of gravitational attraction. As the objects get closer and closer, the force between them __________.
increases
remains constant
decreases
48.
1 point
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.
49.
1 point
Speed is______________.
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.
50.
1 point
In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves.
sometimes true
Always false
Always true
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