How do I find acceleration and tension on an inclined plane

In summary, two objects of 2.8kg and 4.2kg connected by an inextensible cord are resting on a frictionless plane inclined at 22°. With a 60N force pushing the objects downward, the acceleration is calculated to be -12.24 m/s^2 and the tension in the cord is determined to be 25.70N. To solve this problem, drawing free body diagrams for each object can be helpful.
  • #1
ivan ripalda

Homework Statement


Two objects of 2.8kg and 4.2kg are connected by an inextensible cord. The object's at rest on a plane inclined 22°, determine the object's acceleration and tension in the cord if a 60N force is used to push the object downward.

Homework Equations


ΣFnet = ma

the plane is frictionless.

The Attempt at a Solution


a = Σfnet/m
a= weight + F/m
a = -25.70N - 60N / 7kg
a = - 12.24

weight - F -T = ma
T = tension[/B]
 
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  • #2
Welcome to PhysicsForums. The way that this site works for homework problems: you provide your attempt at a solution, then we will provide prompts to help guide you toward the solution. Please add what attempts you have made at a solution.

Hint: it will help you to draw a free body diagram for each object.
 

1. How do I find the acceleration on an inclined plane?

The formula for finding acceleration on an inclined plane is a = gsinθ, where a is the acceleration, g is the acceleration due to gravity (9.8 m/s²), and θ is the angle of the inclined plane. This formula assumes a frictionless surface. If there is friction, the formula becomes a = g(sinθ - μcosθ), where μ is the coefficient of friction.

2. How do I find the tension on an inclined plane?

The tension on an inclined plane can be found using the formula T = mgcosθ, where T is the tension, m is the mass of the object, g is the acceleration due to gravity, and θ is the angle of the inclined plane. This formula also assumes a frictionless surface. If there is friction, the formula becomes T = m(gcosθ - μsinθ), where μ is the coefficient of friction.

3. Can I find the acceleration and tension without knowing the angle of the inclined plane?

Yes, you can find the acceleration and tension without knowing the angle of the inclined plane. You will need to know the height difference between the starting and ending points of the object on the inclined plane and the length of the inclined plane. The formula for finding the angle is θ = arctan(h/l), where θ is the angle, h is the height difference, and l is the length of the inclined plane.

4. How does the mass of the object affect the acceleration and tension on an inclined plane?

The mass of the object does not affect the acceleration on an inclined plane. The acceleration is solely dependent on the angle of the inclined plane and the acceleration due to gravity. However, the mass of the object does affect the tension on an inclined plane. As the mass increases, the tension also increases, assuming the angle and friction remain constant.

5. What is the relationship between the angle of the inclined plane and the acceleration and tension?

The angle of the inclined plane has a direct relationship with both the acceleration and tension. As the angle increases, the acceleration and tension also increase. This is because a steeper angle means there is a greater component of the object's weight acting parallel to the inclined plane, resulting in a greater acceleration and tension.

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