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प्रश्न
Explain why it is easier to pull a lawn mower than to push it.
उत्तर
While pulling a lawn mower, a force at an angle θ is applied to it, as depicted in the figure shown.
The vertical component of the applied force acts upward, reducing the effective weight of the mower.
Conversely, when pushing a lawn mower, a force at an angle θ is exerted on it, as illustrated in the following figure.
In this case, the vertical component of the applied force acts in the direction of the weight of the mower. This increases the effective weight of the mower.
Since the effective weight of the lawn mower is lesser in the first case, pulling the lawn mower is easier than pushing it.
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संबंधित प्रश्न
A mass m is suspended from a rigid support P by means of a massless string as shown in figure. A horizontal force F is applied at point O of the rope. The system is in equilibrium when the string makes an angle θ with the vertical. Then the relation between the tension T, force F and angle θ is P
There are three forces F1, F2 and F3 acting on a body, all acting on a point P on the body. The body is found to move with uniform speed.
- Show that the forces are coplanar.
- Show that the torque acting on the body about any point due to these three forces is zero.
Figure shows (vx, t) and (vy, t) diagrams for a body of unit mass. Find the force as a function of time.
 (a) |
 (b) |
There are four forces acting at a point P produced by strings as shown in the figure, which is at rest. Find the forces F1 and F2.
