A ball thrown vertically upward, at the top of its path (just before it starts to fall) has:
a. an instantaneous speed of zero.
b. the same instantaneous speed it had throughout its trajectory.
c. gone as low as it is going to go.
d. an instantaneous speed of 10 meters per second.
e. an acceleration of zero.
[Ques. 2] Ignoring air resistance, which of these is the acceleration of a falling object?
a. The length of time it takes to reach the ground.
b. About 10 (meters per second) per second.
c. About 10 (meters per second) per meter.
d. About 10 meters per second.
e. Falling objects fall at different speeds, so none of these answers can be right.
[Ques. 3] Which unit is a unit of acceleration?
a. (meters per second) per second
b. kilograms
c. meters
d. seconds
e. (meters per second) per meter
[Ques. 4] In part (a) of this figure, three identical, equally spaced objects are dropped. In part (b), the two green blocks are moved closer together before they are dropped. In part (c), the two green blocks are combined to form one larger block. Contrasting Galileo's and Aristotle's views, what is the most plausible statement about the speed of the large green block compared with that of the small red block?
a. The green block must fall faster because it is more massive.
b. The green block can be seen as two side-by-side smaller blocks falling at the same rate, hence the larger and smaller blocks fall at the same rate.
c. The larger and smaller blocks fall at the same rate only in a vacuum.
d. The larger block speeds up the fall of the lighter block, but only if they are tied together.
e. The lighter block slows the fall of the heavier block, but only if they are tied together.
[Ques. 5] The astronaut's experiment with the hammer and the feather illustrate that:
a. hammers and feathers have the same mass on the Moon.
b. hammers and feathers have the same weight on the Moon.
c. objects of different size, shape, and mass fall at the same rate in a vacuum.
d. the absence of air on the Moon results in different rules of physics.
e. there is no gravity on the Moon.
[Ques. 6] In his experiment with rolling balls down a ramp at different ramp angles, what did Galileo discover?
a. For any fixed ramp angle, the speed of a ball was always constant, regardless of its weight.
b. For any fixed ramp angle, the acceleration of a ball was always constant, regardless of its weight.
c. For any fixed ramp angle, the velocity of a ball was always constant, regardless of weight.
d. The velocity and acceleration were both constant.
e. The heavier balls rolled down the ramp faster.
[Ques. 7] Which of these things did Galileo NOT do?
a. Make up a thought experiment that indicated that objects would fall at the same rate.
b. Invent the concept of acceleration.
c. Stop publishing his scientific work after being convicted of heresy.
d. Experiment with rolling balls down ramps of increasing steepness to test how objects would fall.
e. Argue that Earth moves around the Sun.
[Ques. 8] Which of these statements is true?
a. Aristotle believed that the speed at which objects fall depends on their weight (and he was right).
b. Aristotle believed that the speed at which objects fall depends on the medium they fall through (and he was wrong).
c. Aristotle believed that a falling object was not trying to reach a goal.
d. Aristotle believed that the speed at which objects fall depends on both their weight and the medium they fall through (and he was partly right).
e. Aristotle believed that how fast objects fall depends on both their weight and their surrounding medium (and he was right).
[Ques. 9] Which of the following actions in a car cause it to accelerate?
a. Stepping on the gas pedal to speed the car up.
b. Pressing the brake pedal to slow the car down.
c. Turning the steering wheel to drive in a curved path at constant speed.
d. Any of the above.
e. Only a. or b. above.
[Ques. 10] Which of these would be represented by a vector?
a. fifteen feet north
b. speed
c. volume
d. time
e. distance
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