# Tangential and normal components

1. Jan 3, 2006

### teng125

a particle A is constrained to move in the circular slot of CD.knowing that t=0 the particle A starts from rest and moves so that its speed increases at a constant rate of 0.8in/s^2.Determine the magnitude of its total acceleration when t=2.pls help....

thanx.....

2. Jan 3, 2006

3. Jan 3, 2006

### teng125

i have no idea about it .pls help.....

4. Jan 3, 2006

5. Jan 3, 2006

### Hootenanny

Staff Emeritus
Do you know how to do it or do you still need help?

6. Jan 3, 2006

### teng125

no,i don't know how to do it.those replies are things that i have missed to type

7. Jan 3, 2006

### Staff: Mentor

Hints:
(1) The tangential component is given.
(2) The radial component is also known as centripetal acceleration.

8. Jan 3, 2006

### teng125

i have got acc for tangential=0.8 , but the acc for normal i can't find because i don't know what is the velocity

9. Jan 3, 2006

### Hootenanny

Staff Emeritus
Is the acceleration centripital or tangental?

10. Jan 3, 2006

### teng125

the centripetal acc i can't find

11. Jan 3, 2006

### Staff: Mentor

What's the formula for centripetal acceleration?

12. Jan 3, 2006

### teng125

13. Jan 3, 2006

### Staff: Mentor

Good. So figure out the speed at t = 2 secs and you can calculate the centripetal component of the acceleration.

14. Jan 3, 2006

### teng125

i still can't figure out

15. Jan 3, 2006

### Staff: Mentor

What's the speed at t = 2 seconds? (Hint: the tangential acceleration is constant so it's just uniformly accelerated motion.)

16. Jan 3, 2006

### teng125

is it equals to zero??

17. Jan 3, 2006

### teng125

oh....is it using the formula v=u + at ??

18. Jan 3, 2006

### Staff: Mentor

That's the one.

19. Jan 3, 2006

### teng125

but then i got the velocity=1.6 and try to find the centripetal acc and then the total acc and got the wrong answer.did u get the correct answer??

20. Jan 3, 2006