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Questions and Answers
What is the first step to calculate the speed of an object?
What is the first step to calculate the speed of an object?
- Add distance and time
- Multiply distance and time
- Subtract time from distance
- Divide distance by time (correct)
When changing speed from m/s to Km/h, what should you do?
When changing speed from m/s to Km/h, what should you do?
- Divide by 2.5
- Divide by 3.6
- Multiply by 3.6 (correct)
- Multiply by 2.5
What does the average speed represent?
What does the average speed represent?
- Speed at a specific instant
- Instantaneous speed
- Average value over a time interval (correct)
- Maximum speed reached
Which instrument can display the instantaneous speed of a vehicle?
Which instrument can display the instantaneous speed of a vehicle?
How is instantaneous speed defined?
How is instantaneous speed defined?
What is needed to calculate the average speed of a toy car crossing a room?
What is needed to calculate the average speed of a toy car crossing a room?
Which type of experiment can be conducted to find the average speed of a falling object like a ball?
Which type of experiment can be conducted to find the average speed of a falling object like a ball?
How can you calculate the average speed using a d X t graph?
How can you calculate the average speed using a d X t graph?
Which statement accurately distinguishes speed from velocity?
Which statement accurately distinguishes speed from velocity?
What is the main difference in how speed and velocity are represented symbolically?
What is the main difference in how speed and velocity are represented symbolically?
In the International System of Units (SI), what unit is commonly used to measure both speed and velocity?
In the International System of Units (SI), what unit is commonly used to measure both speed and velocity?
What type of quantity is speed, and why?
What type of quantity is speed, and why?
How does velocity differ from speed?
How does velocity differ from speed?
What does the lack of an arrow over a symbol representing a quantity indicate?
What does the lack of an arrow over a symbol representing a quantity indicate?
How would you define speed in physics as per the information provided?
How would you define speed in physics as per the information provided?
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Study Notes
Speed and Velocity
- Speed and velocity are two different types of quantities: speed is a scalar quantity, while velocity is a vector quantity.
- Speed is defined only by its intensity (or magnitude), while velocity needs to have both magnitude and direction addressed.
Speed Formula
- The formula for speed in physics is: speed = distance / time (or simply: v = d / t)
- Distance is measured in meters (m) and time is measured in seconds (s) according to the International System of Units (SI).
Measuring Speed
- Speed can be measured in different units, such as meters per second (m/s), kilometers per hour (Km/h), miles per hour (Mph), or centimeters per minute (cm/min).
- To transform units between Km/h and m/s, multiply by 3.6 (or divide by 3.6).
Average Speed
- The average speed is calculated by dividing the total distance traveled by the total time taken.
- The average speed is an average value because it includes the speed assumed by the object over a time interval.
Instantaneous Speed
- The calculation of instantaneous speed is more complex and requires mathematical abilities to calculate the rate in one instant (infinitesimal time interval).
- Some instruments, such as the speedometer, can display the instantaneous speed of a vehicle.
Finding Speed
- The required values to calculate average speed can be found in a diagram, such as a graph with a curve indicating time and distance in a movement.
- A homemade experiment can be set up to find average speed by measuring the distance traveled and the time taken.
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