Dynamics of a particle moving in a straight line question

  • Thread starter synkk
  • Start date
  • #1
216
0
A car of mass 900 kg is towing a trailer of mass 300 kg along a straight horizontal road. The car and the trailer are connected by a light inextensible tow-bar and when the speed of the car is 20m s−1the brakes are applied. This produces a braking force of 2400 N. Find

a the deceleration of the car,

b the magnitude of the force in the tow-bar,

c the distance travelled by the car before it stops.

eqbc42.png


Could anyone explain to me why the tension of the car and trailer is against them? Is it because the car is decelerating?
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,836
251
hi synkk! :smile:
ould anyone explain to me why the tension of the car and trailer is against them? Is it because the car is decelerating?

yes

T is actually compression rather than tension (it pushes outward)

if the towbar was a rope, then the car would decelerate but the trailer would carry on at the original speed, so they would get closer

since that isn't happening, the towbar must be keeping them apart, so the force in it must be compression (outward) :wink:
 
  • #3
216
0
hi synkk! :smile:


yes

T is actually compression rather than tension (it pushes outward)

if the towbar was a rope, then the car would decelerate but the trailer would carry on at the original speed, so they would get closer

since that isn't happening, the towbar must be keeping them apart, so the force in it must be compression (outward) :wink:

fast reply, thanks.
 

Related Threads on Dynamics of a particle moving in a straight line question

  • Last Post
Replies
2
Views
1K
Replies
1
Views
2K
Replies
6
Views
2K
Replies
1
Views
4K
  • Last Post
Replies
5
Views
616
  • Last Post
Replies
8
Views
2K
Replies
7
Views
2K
  • Last Post
Replies
7
Views
4K
Top