Before you look at these acceleration word problems, make sure you have mastered the topic about velocity
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.
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!
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!
Dec 16, 16 01:14 PM
Need help with centripetal acceleration? Check this lesson and you will understand perfectly the concept fast