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AP Physics 1 Midterm
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Gravity
Terms in this set (61)
A ball is thrown straight up and returns to its starting point in 8.0 seconds under an acceleration due to gravity. Which of the following is true?
It took the same time to rise as it took to fall.
What can never be negative?
instantaneous speed
A can, after having been given a kick, moves up along a smooth hill of ice. It will
have the same acceleration, both up the hill and down the hill.
All of the following are scalars, except
temperature.
acceleration.
speed.
income.
distance.
acceleration
When a ball is thrown straight up, the acceleration at its highest point is
downward
Can an object have increasing speed while its acceleration is decreasing?
Yes, and an example would be an object released from rest in the presence of air friction
Which physical unit is a velocity?
40 km, SW
32 ft/s2
-120 mi/s
9.8 m/s2
186,000 mi
-120 mi/s
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
In equal times its velocity changes by equal amounts.
A new car manufacturer advertises that their car can go "from zero to sixty in 8 s." This is a description of
average acceleration.
If the acceleration vector of an object is directed anti-parallel (opposite directions) to the velocity vector, then
the object is slowing down.
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages as they are falling will
increase
You hit a volley ball over the net. When the ball reaches its maximum height, its speed is
less than its initial speed.
An Air Force plane doing target practice on a floating target sights the target at an angle of 45º from the vertical. Assuming the plane is flying horizontally, the pilot should aim his guns at an angle, from the vertical, of
the angle depends on the velocity of the plane
If the acceleration of an object is always directed perpendicular to its velocity, then
the object is turning.
At what angle must a projectile be fired in order to get maximum height? (Assume all trials are fired at the same speed.)
90 degrees
Which of the following is an accurate statement?
If three vectors add to zero, they must be in a plane.
Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum
could be as small as 2 m but no more than 12 m.
Which of the following is an accurate statement?
Select one:
1 The magnitude of a vector can be positive or negative.
2 If the magnitude of vector A is less than the magnitude of vector B, then the x component of A is less than the x component of B. Incorrect
3 The magnitude of a vector can be less than the magnitude of one of its components.
4 A vector cannot have zero magnitude.
5 A vector cannot have zero magnitude if one of its components is not zero.
A vector cannot have zero magnitude if one of its components is not zero.
A pilot drops a bomb from a plane flying horizontally at constant speed. When the bomb hits the ground, with respect to the bomb, the horizontal location of the plane will
be directly over the bomb
You toss a ball to your friend who catches it at approximately the same height at which it was thrown. The ball reaches its maximum altitude
in half of the time it is in the air
A soccerball is kicked with a velocity of 25 m/s at an angle of 45° above the horizontal. What is the vertical component of its acceleration as it travels along its trajectory? (Neglect air friction.)
g downward
When air resistance is a factor, maximum range is achieved when the projection angle is
less than 45 degrees
Which of the following is the x component of velocity?
v cos θ
Bullet G is dropped, from rest, at the same time that another bullet H is fired horizontally from low powered a rifle. If both bullets leave from the same height above the ground, then
both bullets hit the ground at the same time.
An Olympic athlete throws a javelin at four different angles above the horizontal, each with the same speed: 30°, 40°, 60°, 80°. Which two throws cause the javelin to land the same distance away?
30 and 60 deg
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
45 deg
Consider a thrown ball which has reached its highest point in flight. The magnitude of the acceleration
is g
Which of the following is the free fall trajectory?
Select one:
parabolic
hyperbolic.
semi-elliptical.
semicircular.
parabolic
A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that
a frictional force is acting on it
It's more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because
μk < μs
A book can slide down a frictionless hill at constant velocity assuming no applied forces (FA) are acting on it.
no
The kinetic friction of one object sliding along another surface depends least upon
the area of contact.
A decoration, of mass M, is suspended by a string from the ceiling inside an elevator. The elevator is traveling UPWARD with a constant speed. The tension in the string is
equal to Mg.
Batter up! Your bat hits the ball pitched to you with a 1500 N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is
exactly equal to 1500 N.
After you sit on a chair, the net force on you is
zero
A big rubber duck is hanging in my classroom motionless. The force of weight is down and the tension of the string is up. What is the reaction force to the weight of the duck is
the Earth being pulled up.
You are standing in a moving bus, and you suddenly fall backward. You can imply from this that the bus's
velocity increased.
If you push a 4-kg mass with the same force that you push a 10-kg mass from rest, then
the 4-kg mass accelerates 2.5 times faster than the 10-kg mass.
Two identical masses are attached by a light string that passes over a small pulley.
The table and the pulley are frictionless. The masses are moving
with an acceleration less than g.
Two people are standing next to each other. Who has a greater weight-to-mass ratio, a person weighing 800 N or a person weighing 700 N?
neither; their ratios are the same
Match the correct unit for the given quantity.
coefficient of friction
acceleration
weight
Force
mass
coefficient of friction - no unit, acceleration - m/sec^2, weight - Newton, Force - Newton, mass - kg
A toolbox, of mass M, is resting on a flat board. One end of the board is lifted up until the toolbox just starts to slide.
The angle θ that the board makes with the horizontal, for this to occur, depends on the
coefficient of static friction, µs
Planning to elope with her boyfriend, Janice slides down a rope from her fourth story window. As she slides down the rope, she tightens harder on the rope which of course increases the tension in the rope. When the upward tension in the rope equals Janice's weight
Janice will continue down at constant speed.
Your mass on the moon will be about one-sixth of your mass on Earth because the acceleration due to gravity on the moon is one-sixth that of the Earth.
no
A 16 kg fish is massed with two spring scales, each of negligible mass
What will be the readings on the scales?
Each scale will read 16 kg.
If two identical masses are attached by a light cord passing over a massless, frictionless pulley of an Atwood's machine, but at different heights, and then released, then
the masses will not move.
An arrow is shot straight up. At the top of its path, the net force acting on it is
equal to its weight.
When the rocket engines on the starship PHYSICS-IS-THE-BEST are suddenly turned off, while traveling in empty space (assuming no gravitational forces are acting on it), the starship will
move with constant speed.
In which of the following situations is no work done on the football?
carrying it down field.
The total mechanical energy of a system
is constant assuming no nonconservative forces act.
Compared to yesterday, you did 3 times the work in one-half the time. To do so, your power output must have been
6 times yesterday's power output.
Is it possible for a system to have negative potential energy?
yes, since the choice of the zero of potential energy is arbitrary.
A 200 g mass attached to the end of a spring causes it to stretch 5.0 cm. If another 200 g mass is added to the spring, the potential energy of the spring will be
4 times as much
In which of the following situations is work done on the football by gravity?
dropping it
You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?
It would have skidded 4 times farther.
A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy (K) compared to that of the car?
The truck has 8 times the K of the car.
If there is no motion, can work be done on a system?
no, because of the way work is defined
King Kong falls from the top of the Empire State Building, through the air (air friction is present), to the ground below. How does his kinetic energy (K) just before striking the ground compare to his potential energy (U) at the top of the building?
K is less than U.
Choose a correct unit for the following:
Nonconservative work
Spring Potential Energy
Kinetic Energy
Force
Potential energy
spring constant
Work
Power
Nonconservative work - Joule, Spring Potential Energy - Joule, Kinetic Energy - Joule, Force - Newton, Potential energy - Joule, spring constant - Newton/meter, Work - Joule, Power - Watt
You (60 kg) and your friend (70 kg) want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so. Compare the gravitational potential energy (U) of you and your friend, after you both reach the top.
He is because he is heavier.
Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do.
Neither of them do any work.
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(a) For an inverted image that is in front of a mirror, is the image distance positive or negative and is the image height positive or negative? Explain. (b) Given the image distance, what additional information is needed to determine the focal length? Explain. (c) Given the object and image heights and a statement as to whether the image is upright or inverted, what additional information is needed to determine the object distance? A small statue has a height of 3.5 cm and is placed in front of a concave mirror. The image of the statue is inverted, 1.5 cm tall, and is located 13 cm in front of the mirror. Find the focal length of the mirror.
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A solenoid has 12 turns per centimeter. What current will produce a magnetic field of $2.0 \times 10 ^ { - 2 } \mathrm { T }$ within the solenoid?
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You are designing a pendulum clock whose period can be adjusted by $10 \%$ by changing the length of the pendulum. By what percent must you be able to change the length to provide this flexibility in the period? Explain.
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A hollow sphere of radius 0.15 m, with rotational inertia $$ I = 0.048 kg \cdot m^2 $$ about a line through its center of mass, rolls without slipping up a surface inclined at $$ 30 ^ { \circ } $$ to the horizontal. At a certain initial position, the sphere's total kinetic energy is 20 J. (a) How much of this initial kinetic energy is rotational? (b) What is the speed of the center of mass of the sphere at the initial position? When the sphere has moved 1.0 m up the incline from its initial position, what are (c) its total kinetic energy and (d) the speed of its center of mass?
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