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Questions and Answers
What is the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?
0 m
What is true for displacement?
Its magnitude is greater than the distance travelled by the object.
What is the average speed of object A between 9:30 am and 11:00 am?
13.33 m/s
In uniform motion, how does an object cover distances in equal intervals of time?
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What type of motion involves unequal distances covered in equal intervals of time?
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What does it mean when an object has zero displacement?
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What is the difference between speed and velocity?
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Define acceleration in terms of velocity.
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How can you differentiate between uniform and non-uniform motion?
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What is average velocity and how is it calculated?
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Explain how the rate of change of velocity relates to acceleration.
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Give an example of an object moving under uniform circular motion.
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What are the equations used to describe the motion of an object moving at uniform acceleration?
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Define uniform circular motion.
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Calculate the distance covered and displacement when an athlete completes one round of a circular track with a diameter of 200 m in 40 s, then continues for 2 minutes 20 s.
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What are Joseph's average speed and velocity when jogging from point A to point B on a 300 m road in 2 minutes 30 seconds?
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Abdul computes an average speed of 20 km/h on his trip to school and 30 km/h on his return trip. What is the average speed for Abdul's entire trip?
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A motorboat accelerates at a constant rate of 3.0 m/s^2 for 8.0 s. How far does the boat travel during this time?
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Study Notes
Motion
- Motion is a change of position, which can be described in terms of distance moved or displacement.
Types of Motion
- Uniform motion: an object covers equal distances in equal intervals of time, e.g., an object moving along a straight line, covering 5m in each second.
- Non-uniform motion: an object covers unequal distances in equal intervals of time, e.g., a car moving on a crowded street or a person jogging in a park.
Speed and Velocity
- Speed: the distance covered per unit time.
- Velocity: the displacement per unit time.
Acceleration
- Acceleration: the change in velocity per unit time.
Uniform Circular Motion
- Uniform circular motion: an object moving in a circular path with uniform speed, e.g., the motion of the moon and the earth, a satellite in a circular orbit around the earth, a cyclist on a circular track at constant speed.
- Examples: an athlete throwing a hammer or discus, a stone moving in a circular path when released.
Equations of Motion
- Equations of motion for an object moving at uniform acceleration:
- v = u + at
- s = ut + ½ at2
- 2as = v2 – u2 where u is initial velocity, a is uniform acceleration, t is time, v is final velocity, and s is distance travelled.
Problems
- Example 1: An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?
- Example 2: Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?
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Description
Test your understanding of displacement and distance in physics with this quiz. Calculate the magnitude of displacement of a farmer moving along the boundary of a square field and determine true statements about displacement. Example questions include time intervals and distance travelled by an object.
