5 Questions
What is the formula to calculate speed, and what do the variables represent?
Speed = Distance / Time, where S is speed, d is distance, and t is time.
What is the conversion factor to convert kilometers per hour to meters per second?
1 km/h = 0.277778 m/s
A car travels 250 miles in 4 hours. What is its speed in miles per hour?
Speed = Distance / Time = 250 mi / 4 h = 62.5 mi/h
What is an important consideration when calculating speed?
Ensuring consistent units of distance and time.
Is speed a vector or scalar quantity?
Speed is a scalar quantity, meaning it has no direction.
Study Notes
Calculating Speed From Distance And Time
Formula for Speed:
- Speed = Distance / Time
- S = d / t
Units of Speed:
- Speed can be expressed in various units, including:
- Metres per second (m/s)
- Kilometres per hour (km/h)
- Miles per hour (mi/h)
- Feet per second (ft/s)
Converting Between Units:
- To convert between units, use the following conversion factors:
- 1 km/h = 0.277778 m/s
- 1 mi/h = 0.44704 m/s
- 1 ft/s = 0.3048 m/s
Example Calculations:
- Calculate the speed of an object that travels 100 km in 2 hours:
- Speed = Distance / Time = 100 km / 2 h = 50 km/h
- Calculate the speed of an object that travels 200 m in 10 seconds:
- Speed = Distance / Time = 200 m / 10 s = 20 m/s
Important Notes:
- When calculating speed, ensure that the units of distance and time are consistent.
- Speed is a scalar quantity, meaning it has no direction.
Calculating Speed From Distance And Time
Formula for Speed
- Speed is calculated by dividing distance by time: Speed = Distance / Time or S = d / t
Units of Speed
- Speed can be expressed in various units, including:
- Metres per second (m/s)
- Kilometres per hour (km/h)
- Miles per hour (mi/h)
- Feet per second (ft/s)
Converting Between Units
- Conversion factors for speed units:
- 1 km/h = 0.277778 m/s
- 1 mi/h = 0.44704 m/s
- 1 ft/s = 0.3048 m/s
Example Calculations
- Speed calculations:
- 100 km in 2 hours = 50 km/h
- 200 m in 10 seconds = 20 m/s
Important Notes
- Ensure consistent units of distance and time when calculating speed
- Speed is a scalar quantity, meaning it has no direction
Learn how to calculate speed using the formula speed = distance / time, and understand the different units of speed, including meters per second, kilometres per hour, and miles per hour. Also, learn how to convert between units.
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