Magnitude and direction of acceleration

AI Thread Summary
The discussion focuses on calculating the magnitude and direction of acceleration for a car that stops from an initial speed of 35 km/hr over a distance of 15 meters. The initial response incorrectly suggested a speed instead of acceleration, prompting clarification on the need for uniform acceleration and the correct use of SUVAT equations. Participants emphasized the importance of showing work and using appropriate terminology, specifically distinguishing between "braking" and "breaking" force. Additionally, the connection between acceleration and force was highlighted, indicating the need for a relevant equation. Overall, the thread underscores the necessity of clear problem-solving steps in physics homework.
AshleyAg
Messages
1
Reaction score
0

Homework Statement


A car with a mass of 1.3x10^4kg is initially moving at 35 km/hr in a straight line when the car comes to a complete stop at 15m. What is the magnitude and direction of acceleration?b) the magnitude and direction of the breaking force c) thetime required to stop

Homework Equations

The Attempt at a Solution


I got a) 20 m/s b) I didn't understand & c) I didn't understand eathier[/B]
 
Last edited:
Physics news on Phys.org
Hi! You need to include an attempt at a solution, or we can't help you with the problem. Please edit your post and give us any attempts you've made. :smile:
 
Technically, the question ought to state that acceleration is uniform. Do you know the SUVAT equations?

A) asks for the magnitude and direction of an acceleration. Your proposed answer is a speed. If you meant 20m/s2 then I don't think that is right (and you still have not specified a direction). Please post the equations you applied and show your working.

For b), what equation connects acceleration with force? (And it's braking force, not breaking force. Nothing gets broken in the process.)
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

Finding the magnitude and direction of a boat's motion
Replies
7
Views
2K
Intuition on the direction of friction in a rotational dynamics problem
Replies
13
Views
2K
Resistance force changing the velocity of an object
Replies
8
Views
1K
Magnitudes and Directions In Uniform Circular Motion
Replies
1
Views
2K
Calculate the magnitude and direction of the torque
Replies
1
Views
2K
How Do You Calculate the Magnitude of Acceleration in an Elevator?
Replies
4
Views
4K
What is the displacement and average velocity of a classic car in a road rally?
Replies
1
Views
2K
What is the magnitude of acceleration?
Replies
6
Views
2K
Calculating the magnitude of the total electric field at P
Replies
3
Views
3K
Car Rounding Curve: Acceleration Calculation with C=2piR
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top