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# M1-(mechanics) thrust watch

1. can someone explain me the difference between thrust and tension please?
(with example if possible)
2. (Original post by Qer)
can someone explain me the difference between thrust and tension please?
(with example if possible)
This sometimes comes up in situations where are car is towing a trailer and the two are connected by a light inextensible rod. If the car is accelerating and/or going uphill and/or there is a frictional force resisting the trailer's motion, the forces at the ends of the rod will be as follows:

* At the connection between the car and the rod, the car is exerting a force F on the rod in the direction of motion. The rod is exerting an equal force F on the car in the opposite direction. (Newton's third law of motion).

* At the connection between the rod and the trailer, the rod is exerting force F on the trailer in the direction of motion and the trailer is exerting an equal force F on the rod in the opposite direction.

* The forces acting on the rod are acting as though to stretch it, so the rod is said to be in tension. Tension = F.

If the car is decelerating and/or going downhill, the directions of all the forces mentioned above are reversed. The trailer is now pushing the car rather than being pulled by it. The equal forces F acting on the rod are acting as though to compress it. The wording sometimes used in this situation is that there is thrust in the rod rather than tension. Thrust = F.
3. (Original post by old_engineer)
This sometimes comes up in situations where are car is towing a trailer and the two are connected by a light inextensible rod. If the car is accelerating and/or going uphill and/or there is a frictional force resisting the trailer's motion, the forces at the ends of the rod will be as follows:

* At the connection between the car and the rod, the car is exerting a force F on the rod in the direction of motion. The rod is exerting an equal force F on the car in the opposite direction. (Newton's third law of motion).

* At the connection between the rod and the trailer, the rod is exerting force F on the trailer in the direction of motion and the trailer is exerting an equal force F on the rod in the opposite direction.

* The forces acting on the rod are acting as though to stretch it, so the rod is said to be in tension. Tension = F.

If the car is decelerating and/or going downhill, the directions of all the forces mentioned above are reversed. The trailer is now pushing the car rather than being pulled by it. The equal forces F acting on the rod are acting as though to compress it. The wording sometimes used in this situation is that there is thrust in the rod rather than tension. Thrust = F.
What will be the direction of tension Force (opposite to the direction of acceleration )?
4. (Original post by Qer)
What will be the direction of tension Force (opposite to the direction of acceleration )?
There is not a single direction for tension. The directions of the forces acting on the rod are as indicated in my earlier post.

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