2.1.1 Reading Quiz - Mechanics
Answer all questions. These should test to see if you have read the material.
- 1.
What is the definition of displacment?
- A.
Distance from a fixed point.
- B.
Distance moved from a fixed point.
- C.
Distance and direction from a fixed point.
Correct Answer
C. Distance and direction from a fixed point.Explanation
Displacement is a vector quantity that refers to the distance and direction from a fixed point. It is different from distance, which only measures the length of the path traveled. Displacement takes into account both the magnitude and direction of the movement, providing a more comprehensive description of an object's change in position.Rate this question:
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- 2.
What is the definition of average velocity
- A.
Distance travelled divided by time taken
- B.
Displacement travelled divided by time taken
- C.
Rate of change of distance
- D.
The rate of change of velocity
Correct Answer
B. Displacement travelled divided by time takenExplanation
Average velocity is defined as the displacement travelled divided by the time taken. Displacement refers to the change in position from the starting point to the ending point, while time refers to the duration of the journey. By dividing the displacement by the time, we obtain the average velocity, which represents the overall change in position per unit time. This measure is different from average speed, which only considers the total distance travelled divided by the time taken.Rate this question:
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- 3.
Definition of acceleration
- A.
Rate of change of distance
- B.
Rate of change of velocity
- C.
Rate of change of displacement
- D.
Rate of change of speed
- E.
When something speeds up
- F.
When something slows down
Correct Answer
B. Rate of change of velocityExplanation
The correct answer is "rate of change of velocity". Acceleration is defined as the rate at which an object's velocity changes over time. It measures how quickly an object's speed or direction changes. Therefore, the rate of change of velocity is the most accurate explanation for acceleration.Rate this question:
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- 4.
Gradient of a distance time graph gives...
- A.
Average speed
- B.
Average velocity
- C.
Instantaneous speed
- D.
Instantaneous velocity
- E.
Average acceleration
- F.
Instantaneous acceleration
Correct Answer
C. Instantaneous speedExplanation
The gradient of a distance-time graph represents the rate at which the distance is changing with respect to time. Instantaneous speed is the magnitude of the instantaneous velocity, which is the rate at which an object is moving at a particular moment in time. Therefore, the gradient of a distance-time graph gives the instantaneous speed.Rate this question:
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- 5.
Gradient of a dispacement time graph gives...
- A.
Average speed
- B.
Average velocity
- C.
Instantaneous speed
- D.
Instantaneous velocity
- E.
Average acceleration
- F.
Instantaneous acceleration
Correct Answer
D. Instantaneous velocityExplanation
The gradient of a displacement-time graph represents the rate of change of displacement with respect to time. This rate of change is equivalent to the velocity of an object at a specific moment in time. Therefore, the correct answer is instantaneous velocity.Rate this question:
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- 6.
Gradient of a velocity time graph gives...
- A.
Average speed
- B.
Average velocity
- C.
Instantaneous speed
- D.
Instantaneous velocity
- E.
Average acceleration
- F.
Instantaneous acceleration
Correct Answer
F. Instantaneous accelerationExplanation
The gradient of a velocity-time graph represents the rate of change of velocity with respect to time. Since acceleration is defined as the rate of change of velocity, the gradient of a velocity-time graph gives the instantaneous acceleration.Rate this question:
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- 7.
A ball is thrown downward (not dropped) from the top of a tower. After being released, its downward acceleration will be
- A.
Greater than g
- B.
Exactly g
- C.
Smaller than g
- D.
Zero
Correct Answer
B. Exactly gExplanation
When a ball is thrown downward from the top of a tower, it experiences the force of gravity acting in the downward direction. This force causes the ball to accelerate in the same direction as gravity, which is downward. The magnitude of this acceleration is equal to the acceleration due to gravity, denoted as "g". Therefore, the correct answer is "exactly g". The downward acceleration of the ball will be equal to the acceleration due to gravity.Rate this question:
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- 8.
A stone is dropped from a flying helicopter. Ignoring air resistance, how far will it have fallen after 10 seconds?
- A.
50m
- B.
100m
- C.
500m
- D.
1000m
Correct Answer
C. 500mExplanation
The stone will have fallen 500m after 10 seconds because the distance fallen by an object in free fall is determined by the equation d = 1/2gt^2, where d is the distance, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time. Plugging in the values, we get d = 1/2 * 9.8 * (10^2) = 1/2 * 9.8 * 100 = 490m. Rounded to the nearest meter, the stone will have fallen 500m after 10 seconds.Rate this question:
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- 9.
Without air resistance, an object dropped from a plane flying at constant speed in a straight line will
- A.
Quickly lag behind the plane
- B.
Remain vertically under the plane
- C.
Move ahead of the plane
- D.
Stay still
Correct Answer
B. Remain vertically under the planeExplanation
When an object is dropped from a plane flying at a constant speed in a straight line, it will continue to move horizontally with the same velocity as the plane. Since there is no air resistance, there are no external forces acting on the object horizontally. Therefore, the object will remain vertically under the plane as it falls vertically due to gravity.Rate this question:
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- 10.
When a stone is thrown vertically upwards, what can be said about when it is at its highest point?
- A.
Velocity is a maximum, acceleration is zero
- B.
Velocity is zero, acceleration is zero
- C.
Velocity is a maximum, acceleration is 10ms-2
- D.
Velocity is zero, acceleration is 10ms-2
Correct Answer
D. Velocity is zero, acceleration is 10ms-2Explanation
When a stone is thrown vertically upwards, it reaches its highest point when its velocity is zero. At this point, the stone momentarily stops moving upwards and starts to fall back downwards due to the force of gravity. However, the acceleration of the stone at its highest point is still 10ms-2, as gravity continues to act on it and accelerate it downwards. Therefore, the correct answer is "velocity is zero, acceleration is 10ms-2".Rate this question:
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- 11.
Are there any parts of this section that you found confusing? If so, describe it here.
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Mar 20, 2023Quiz Edited by
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Oct 16, 2012Quiz Created by
Gboulton
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