TB = 140 N

TC = 150 N

Problem
Figure 5.7 shows a block with mass m on a frictionless plane, tilted by an angle [theta]. What is the acceleration of the block ?

Figure 5.7. Mass m on an inclined plane.

In order to determine the acceleration of the block we have to determine the total force acting on the block along the inclined plane. Two forces act on the block: the gravitational force exerted by the earth on the block, and a force, called the normal force exerted by the plane on the block (see Figure 5.8). This force must be present since in its absence mass m will experience free fall (instead of sliding motion). Since the normal force is normal to the inclined plane it does not have a component along it. The component of the gravitational force along the inclined plane is given by
The acceleration produced by this force can be determined from Newton's second law

Figure 5.8. Forces acting on mass m.

Motion 5.4.1 Torrent

Sample Problem 5-8
Figure 5.9 shows a block with mass m held by a cord on a frictionless plane, tilted by an angle [theta]. What is the tension in the cord ? What force does the plane exert on the block ?

Figure 5.9. Sample Problem 5-8.

This problem can be solved easily if the coordinate system is chosen carefully. The best choice of coordinate system is shown in Figure 5.10. Since the block is at rest, the net force on it must be zero:
Due to the choice of the coordinate system, both N and T only have components along the y-axis and x-axis, respectively:
The mass will stay at rest if all components of the net force are zero:
From these equations we can obtain N and T:

Figure 5.10. Coordinate System # 1 used in Sample Problem 5-8.

Figure 5.11. Coordinate System # 2 used in Sample Problem 5-8.

The standard choice of coordinate system with the x-axis coinciding with the horizontal direction and the y-axis coinciding with the vertical direction (see Figure 5.11) would have made the problem significantly more difficult. In this coordinate system, N and T have component along both the x and y direction:
In this case, N and T can be obtained by solving the following equations:
Of course, the solutions for N and T are identical to those derived previously, but the derivation is harder.
Sample Problem 5-10
Two blocks are connected by a cord that passes over a (weightless) pulley (see Figure 5.12). Find the tension in the cord and the (common) acceleration.
The blocks are moving with a constant acceleration. Since the cord is assumed to rigid, the acceleration of mass m has to be equal to the acceleration of mass M. However, since the pulley reverses the direction of motion, the direction of the acceleration of mass m is opposed to the direction of the acceleration of mass M. For each of the masses we can write down the following force equations:
The first equation can be used to express T in terms of a:
Substituting this expression for T into the second equation, we obtain:

Figure 5.12. Setup Sample Problem 5-10.

The acceleration a can now be calculated:
Note that a is positive when M > m, and a is negative when M < m. The acceleration is zero if m = M. This of course agrees with what our expectations. The tension in the cord can now be calculated:
Problem
A block of mass m1 on a smooth inclined plane of angle [theta] is connected by a cord over a small frictionless pulley to a second block of mass m2 hanging vertically (see Figure 5.13). The mass of the cord and the pulley can be neglected.
a) What is the acceleration of each block ?
b) What is the tension in the cord ?

Figure 5.13. Inclined plane and pulley.

In order to determine the acceleration and the tension, we have to identify all forces acting on both masses. The following forces act on m1 (see Figure 5.14):

* The gravitational force W1 = m1 g. This force is pointing downwards in the vertical direction.

* The normal force N. This force is exerted by the surface of the inclined plane on the mass and is pointing in a direction perpendicular to the inclined it.

* Tension T. The cord exerts this force on the mass. Its direction is parallel to the inclined plane.
In general, the net force acting on m1 will be non-zero and m1 will have a non-zero acceleration. The acceleration will be along the x-axis (see Figure 5.14) and is defined to be positive if the acceleration is in the same direction as the tension T. The components of the net force acting on m1 are given by

(1)

(2)

Figure 5.14. Forces acting on m1.

Figure 5.15. Forces acting on m2.

The following forces act on m2 (see Figure 5.15):

* The gravitational force W2 = m2 g. This force is pointing downwards along the vertical.

* The tension T. The cord exerts this force on the mass. This force is pointing upwards along the vertical. The tension in the cord is the same at each point, and the magnitude of this force is therefore equal to the one acting on m1 although it points in a different direction.
The net force on m2 will be non-zero and the mass will accelerate. Since m1 and m2 are connected via a cord, they will have the same acceleration. If the direction of the acceleration of m1 is along T, the direction of the acceleration on m2 will be along W2 (see Figure 5.15). None of the forces acting on m2 has a component along the x-axis and we will therefore only consider the net force along the y-axis:

(3)

Equations (1) and (3) are two equations with two unknown (T and a), and can be solved. Equation (3) can be rewritten as

(4)

Substituting equation (4) for T in equation (1), we can determine a:

(5)

Substituting equation (5) into equation (4) we obtain the tension T:

(6)

Send comments, questions and/or suggestions via email to [email protected] and/or visit the home page of Frank Wolfs.
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