Before you look at these acceleration word problems, make sure you have mastered the topic about velocity
Problem #1:
What is the acceleration of a motorcycle moving on a straight path when the speed goes from 0 to 70 miles per hour in 5 seconds ?
The motorcycle goes from 0 to 70 m/h, so the change in speed is
70 - 0 = 70
It took the motorcycle 5 seconds to reach this velocity so the time interval is 5.
Plug these numbers into the formula.
Acceleration = 14 m/h.s
Remember how to read the answer.
We read 14m/h.s as 14 miles per hour-second.
In order words, each second, the speed increases by 14 miles per hour.
Problem #2:
What is the acceleration of Honda with a constant velocity of 50 km/h for 20 second? Does the car have a constant acceleration?
If the Honda has a constant velocity, this means that the speed is constant and the car is going in a straight path.
Because the speed is constant, the car is not accelerating.
The driver probably put the car on cruise control with a speed of 50 km/h for 20 seconds.
So a = 0.
There is a world of difference between constant acceleration and constant velocity.
Constant acceleration means that the speed is changing. However, it is changing by the same amount.
For example from 10 km/h to 20 km/h, then from 20 km/h to 30 km/h, etc.
The change in speed is always 10 km/h, so this is a constant acceleration.
Constant velocity on the other hand means that the speed is not changing!
Problem #3:
You can speed up from 0 to 25 feet/s in 25 seconds
Your brother can speed up from 0 to 6 feet/s in 6 seconds
Who is faster?
Each second, you speed can increase by 1 foot/second.
If it is hard to see, you can always use the acceleration formula
Therefore, neither you nor your brother is faster.
Problem #4: Your turn! I will not solve this acceleration word problem for you
Two cars are racing on the highway with the same constant acceleration of 10 miles per hour-second. They do this for 12 second.
Do you think the cars set their cruise control?
What was the instantaneous speed of the cars at the 5-second mark?
What is the highest instantaneous speed of the cars?
Share your solution here. Don't submit your own problem here. It will be ignored!
Back to definition of acceleration
Dec 16, 16 01:14 PM
Need help with centripetal acceleration? Check this lesson and you will understand perfectly the concept fast
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