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Questions and Answers
What is the formula for calculating speed?
What is the formula for calculating speed?
- Speed = time/distance
- Speed = distance/time squared
- Speed = distance + time
- Speed = distance/time (correct)
What would be necessary to find the actual speed of a moving object at an instant?
What would be necessary to find the actual speed of a moving object at an instant?
- Knowing the distance covered over a short time period (correct)
- Measuring the distance without any time limit
- Using a constant speedometer reading
- Calculating the average speed over a long distance
If a car travels 300 km in 5 hours, what is the average speed of the car?
If a car travels 300 km in 5 hours, what is the average speed of the car?
- 60 km/h (correct)
- 75 km/h
- 90 km/h
- 30 km/h
What is the relationship between average speed, total distance, and total time taken?
What is the relationship between average speed, total distance, and total time taken?
How is the speed of the golf club-head as it hits the ball measured in the provided context?
How is the speed of the golf club-head as it hits the ball measured in the provided context?
What happens to the speedometer reading during a journey, if the average speed is 60 km/h over 5 hours?
What happens to the speedometer reading during a journey, if the average speed is 60 km/h over 5 hours?
If a car maintains a constant speed of 60 km/h, how far will it travel in 5 hours?
If a car maintains a constant speed of 60 km/h, how far will it travel in 5 hours?
What does average speed definitively equal?
What does average speed definitively equal?
What method can be used to determine an object's speed at an exact moment in time?
What method can be used to determine an object's speed at an exact moment in time?
Why is it important to consider average speed instead of instantaneous speed?
Why is it important to consider average speed instead of instantaneous speed?
At what speed did the golfer's club-head hit the ball?
At what speed did the golfer's club-head hit the ball?
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Study Notes
Definition of Speed
- Speed is defined as the distance traveled per unit of time.
- Formula: Speed (v) = Distance (s) / Time (t)
Average Speed
- Average speed is calculated by dividing the total distance by the total time taken.
- Example: For a journey of 300 km in 5 hours, the average speed is 60 km/h (300 km / 5 h).
Instantaneous Speed
- Instantaneous speed refers to the speed of a body at a specific moment.
- Requires knowledge of distance covered in a very short time interval to measure.
Measurement Techniques
- Multiflash photography can capture the movement of objects at high speeds by illuminating them rapidly, aiding in speed measurement.
- An example includes the speed of a golf club-head, which can reach about 200 km/h at impact.
Key Insights
- Speedometers do not always reflect average speed due to variations in speed during a journey.
- Understanding both average and instantaneous speed is critical for accurate assessment of motion.
Definition of Speed
- Speed is defined as the distance traveled per unit of time.
- Formula: Speed (v) = Distance (s) / Time (t)
Average Speed
- Average speed is calculated by dividing the total distance by the total time taken.
- Example: For a journey of 300 km in 5 hours, the average speed is 60 km/h (300 km / 5 h).
Instantaneous Speed
- Instantaneous speed refers to the speed of a body at a specific moment.
- Requires knowledge of distance covered in a very short time interval to measure.
Measurement Techniques
- Multiflash photography can capture the movement of objects at high speeds by illuminating them rapidly, aiding in speed measurement.
- An example includes the speed of a golf club-head, which can reach about 200 km/h at impact.
Key Insights
- Speedometers do not always reflect average speed due to variations in speed during a journey.
- Understanding both average and instantaneous speed is critical for accurate assessment of motion.
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