The object’s velocity is positive in region(s) II.
Question 6
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of
gravity is 9.8 m/s2. The ball is referred to at the two-second time.
The distance the ball is below the rooftop in meters is: Answer 19.6.
Question 7
The acceleration of a ball as it rolls down a ramp is 4 m/s2. The ball is referred to 2 s after it
starts to roll. The acceleration in m/s2 after starting from rest is Answer: 4.
Question 8
The acceleration of a ball as it rolls down a ramp is 4 m/s2. The ball is referred to 2 s after it
starts to roll. The distance from the starting point in meters is Answer: 8.
Question 9
A ball thrown upwards reaches a maximum height and then comes back down to the original
level. As the ball is going downwards Answer: the velocity and acceleration both point
down.
IncQuestion 10
Motion in a circle at constant speed is motion with Answer: none of the above
Rationale: Both v and a are continuously changing direction and therefore not
constant.
Question 11
A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is
Answer: 8 m/s2.
Question 12
Question 15
The slope of a distance vs. time graph is the Answer: velocity.
Question 16
If an object’s speed is constant, its velocity must also be constant. Answer: False
Question 17
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III.
The object is never at rest. Answer: False
Question 18
Motion in a circle at constant speed is motion with constant velocity. Answer: False
Question 19
The figure shows a distance versus time graph for an object.
The velocity of the moving object is a non-zero constant. Answer: True
Question 20
The terms velocity and speed have identical meanings in physics. Answer: False
Question 21
The figure shows a distance versus time graph for an object.
The acceleration of the moving object is a non-zero constant. False
Question 22
A fast-moving body must have a larger acceleration than a slow-moving body. False
Question 23
The acceleration of a ball as it rolls down a ramp is 4 m/s2. The ball is referred to 2 s after it
starts to roll. The acceleration after starting from rest is 8 m/s2. Answer: False
Question 24
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III.
The object’s speed is greatest in region I. Answer: False
Question 25
A race car goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is 8
m/s2. Answer: True
Question 26Select the closest matching pairs possible. 3 pts for each response.
Velocity : Vector quantity including displacement per time with direction.
Acceleration: Change of velocity with time
Speed: Scalar quantity including displacement per time.
Centripetal Acceleration : Acceleration of an object moving in a circular path
Circular Motion: Velocity would have a continuously changing direction
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