[size=150]The applet can help you to understand speed as a rate : It is the distance travelled per unit of time.[br]In the applet, unit for time is seconds, and unit for distance is metres.[br]After you explore the applet, answer the 4 questions below the applet,[/size]
[size=150]1. How far (in metres) can the red car go if it continues for 150 seconds [/size]
[size=150][br]Total distance travelled by red car after 150 seconds [br]=150 x 20 = 3000 m[/size]
[size=150]2. How long (in seconds) will it take the blue car to move 1200 m?[/size]
[size=150][br]Total time taken by blue car to travel 1200 m[br]= 1200 /4 = 300 seconds[/size]
[size=150]3. If the blue car engine is replaced with a more powerful engine, and it can travel 1200 m in 30 s, will it be faster than the red car?[/size]
[size=150][br]Speed of blue car with new engine[br][/size]= 1200/30 = 40 m/s[br][size=150]The red car's speed is 20 m/s. [br][/size][size=150]Yes the blue car will be faster than the red car with the new engine[/size]
[size=150]4. Can you write down the relationship (formula or equation) between distance (d), speed(v) and time (t) using algebraic notation ie. d, s and t ?[br][br]Distance d = __________? (in terms of v & t)[br]Speed v = __________? in terms of d & t)[br]Time t = __________? (in terms of v & d)[/size]
[size=150][br]Distance d = v t (in terms of v & t)[br]Speed v = d/t (in terms of d & t)[br]Time t = d/v (in terms of v & d)[/size]