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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?
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?
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?
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?
In uniform motion, how does an object cover distances in equal intervals of time?
What type of motion involves unequal distances covered in equal intervals of time?
What type of motion involves unequal distances covered in equal intervals of time?
What does it mean when an object has zero displacement?
What does it mean when an object has zero displacement?
What is the difference between speed and velocity?
What is the difference between speed and velocity?
Define acceleration in terms of velocity.
Define acceleration in terms of velocity.
How can you differentiate between uniform and non-uniform motion?
How can you differentiate between uniform and non-uniform motion?
What is average velocity and how is it calculated?
What is average velocity and how is it calculated?
Explain how the rate of change of velocity relates to acceleration.
Explain how the rate of change of velocity relates to acceleration.
Give an example of an object moving under uniform circular motion.
Give an example of an object moving under uniform circular motion.
What are the equations used to describe the motion of an object moving at uniform acceleration?
What are the equations used to describe the motion of an object moving at uniform acceleration?
Define uniform circular motion.
Define uniform circular motion.
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.
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.
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?
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?
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?
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?
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?
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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