Turning Effects Of Forces- An Jun

1. The turning effect of a force on a door is greater when it is applied at

A point near the hinges and perpendicular to the door

A point near the hinges and parallel to the door

A point far away from the hinges and perpendicular to the door

A point far away from the hinges and parallel to the door

When a force is applied at a point far away from the hinges and perpendicular to the door, it creates a larger turning effect or torque. This is because the distance between the point of application and the axis of rotation (hinges) is greater, resulting in a longer lever arm. The longer the lever arm, the greater the torque produced by the force. Additionally, the force being applied perpendicular to the door allows for the maximum rotational effect. Therefore, the combination of a point far away from the hinges and perpendicular to the door creates the greatest turning effect.

Explanation

When a force is applied at a point far away from the hinges and perpendicular to the door, it creates a larger turning effect or torque. This is because the distance between the point of application and the axis of rotation (hinges) is greater, resulting in a longer lever arm. The longer the lever arm, the greater the torque produced by the force. Additionally, the force being applied perpendicular to the door allows for the maximum rotational effect. Therefore, the combination of a point far away from the hinges and perpendicular to the door creates the greatest turning effect.

2. Two equal and oppositely directed forces acting on an object will be in equilibrium

Only if they act on the same point on the object

If they are separated by a distance

When they are balanced by a third force

When their moments about the same point are equal

Two equal and oppositely directed forces acting on an object will be in equilibrium when their moments about the same point are equal. This means that the forces are balanced and there is no net torque acting on the object. The concept of moments refers to the rotational effect of a force, and when the moments of the two forces about the same point are equal, they cancel each other out and the object remains in a state of equilibrium.

Explanation

Two equal and oppositely directed forces acting on an object will be in equilibrium when their moments about the same point are equal. This means that the forces are balanced and there is no net torque acting on the object. The concept of moments refers to the rotational effect of a force, and when the moments of the two forces about the same point are equal, they cancel each other out and the object remains in a state of equilibrium.

3. Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?

Jack

Jill

Both of them

None of them

Jill will move down because the see-saw will rotate around the pivot point due to the imbalance of weights. The torque exerted by Jill's weight is greater than the torque exerted by Jack's weight. Torque is calculated by multiplying the weight by the distance from the pivot. Since Jill's weight is greater and she sits closer to the pivot, her torque is larger, causing the see-saw to rotate in her direction and move her down.

Explanation

Jill will move down because the see-saw will rotate around the pivot point due to the imbalance of weights. The torque exerted by Jill's weight is greater than the torque exerted by Jack's weight. Torque is calculated by multiplying the weight by the distance from the pivot. Since Jill's weight is greater and she sits closer to the pivot, her torque is larger, causing the see-saw to rotate in her direction and move her down.

4. The diagram shows a light beam pivoted at one end. What is the effort required to lift the load?

50

67

100

200

The diagram shows a light beam that is pivoted at one end. The effort required to lift the load is represented by the value of 50.

Explanation

The diagram shows a light beam that is pivoted at one end. The effort required to lift the load is represented by the value of 50.

5.

The cone is in ____________ because if it is tilted slightly, it returns to its _______________________

The cone is in stable equilibrium because if it is tilted slightly, it returns to its original position without toppling. This means that the cone is balanced and any small disturbance does not cause it to fall over. The cone's shape and weight distribution allow it to maintain its stability and remain upright.

Explanation

The cone is in stable equilibrium because if it is tilted slightly, it returns to its original position without toppling. This means that the cone is balanced and any small disturbance does not cause it to fall over. The cone's shape and weight distribution allow it to maintain its stability and remain upright.

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