I CAN CALCULATE SPEED USING THE SPEED = DISTANCE/TIME FORMULA
SPEED DISTANCE TIME FORMULA
The speed distance time triangle is a way to describe the relationship between speed, distance and time as shown by the formula below.
Speed = distance ÷ time “Speed equals distance divided by time”
Let’s look at an example to calculate speed.
If a car travels 66km in 1.5 hours then we can use this formula to calculate the speed.
Speed = distance ÷ time = 66÷ 1.5 = 44km/h
MAKE SURE YOUR UNITS ARE CORRECTWhen you use the speed distance time formula you must check that each measure is in the appropriate unit before you carry out the calculation. Sometimes you will need to convert a measure into different units. Use the calculations cheat sheet above when you need.
It is very important to be aware of the units being used when calculating speed, distance and time.
When you use the speed distance time formula you must check that each measure is in the appropriate unit before you carry out the calculation. Sometimes you will need to convert a measure into different units. Use the calculations cheat sheet above to help.
The speed distance time triangle is a way to describe the relationship between speed, distance and time as shown by the formula below.
Speed = distance ÷ time “Speed equals distance divided by time”
Let’s look at an example to calculate speed.
If a car travels 66km in 1.5 hours then we can use this formula to calculate the speed.
Speed = distance ÷ time = 66÷ 1.5 = 44km/h
MAKE SURE YOUR UNITS ARE CORRECTWhen you use the speed distance time formula you must check that each measure is in the appropriate unit before you carry out the calculation. Sometimes you will need to convert a measure into different units. Use the calculations cheat sheet above when you need.
It is very important to be aware of the units being used when calculating speed, distance and time.
- Examples of units of distance: mm, cm, m, km, miles
- Examples of units of time: seconds (sec), minutes, (mins) hours (hrs), days
- Examples of units of speed: metres per second, (m/s), miles per hour (mph), kilometres per hour (km/hr)
When you use the speed distance time formula you must check that each measure is in the appropriate unit before you carry out the calculation. Sometimes you will need to convert a measure into different units. Use the calculations cheat sheet above to help.
I CAN IDENTIFY ACCELERATION & DECELERATION IN DISTANCE TIME GRAPHS
I CAN CALCULATE F = MA
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Force = mass x acceleration or F=ma.
EXAMPLE: A boat with a mass of 1400kg accelerates from rest to a speed of 40m/s in 15 seconds. What is the force acting on the car during this acceleration? Given: Mass =1400 kg Initial speed u = 0m/s (as it starts from rest) final speed v = 40m/s Time t = 15 seconds First, we need to calculate the acceleration (a) using the formula: a = v - u / t a = 40 m/s − 0 m/s divided by 15 s a =40 m/s divided by 15 s a ≈2.67 m/s Now, we can calculate Force = Mass × Acceleration Force = 1400 kg × 2.67 m/s2 Force ≈ 3738 N. So, the force acting on the boat during its acceleration is approximately 3738 N |
math_problem_solving_strategy.docx | |
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File Type: | docx |