Physics Test: Practice Questions On Moments, Levers And Gears!

A pivot is a point or shaft on which a mechanism turns or oscillates. Similarly, a fulcrum is a point on which a lever pivots. Therefore, a pivot and a fulcrum are essentially the same thing, making "Fulcrum" the correct answer.

In order for a see-saw to balance, the anti-clockwise moment (force multiplied by distance from the pivot) must equal the clockwise moment. This means that the forces acting on either side of the pivot point must be in equilibrium, with the clockwise moment exerted by one side being counterbalanced by the anti-clockwise moment exerted by the other side. The weight or mass of the objects on the see-saw is not directly related to the balancing of the see-saw, as it is the distribution of these weights or masses that determines the moments. Therefore, the correct answer is Clockwise Moment.

The given answer "Turning effect of a force" is correct because moment refers to the turning effect or rotational force produced by a force acting on an object. It is a measure of how effectively a force can cause an object to rotate around a pivot point. This concept is widely used in physics and engineering to understand and analyze the behavior of objects under the influence of forces.

The unit of the moment is Nm, which stands for Newton-meter. This unit is used to measure torque or rotational force. The Newton is the unit of force, and the meter is the unit of distance. Therefore, Nm represents the force applied at a distance from a pivot point, resulting in a rotational effect.

The explanation for the given correct answer is that Newtons (N) is indeed the unit of force. It is named after Sir Isaac Newton, who formulated the laws of motion and gravity. The Newton is defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. This unit is widely used in physics and engineering to quantify and measure different types of forces. Therefore, the statement "Newtons (N) is the unit of force" is true.

The given statement is false. Newtons (N) is the unit of weight, not Newtons (K). Weight is a measure of the force of gravity on an object, and it is measured in Newtons (N).

Moment = distance from pivot x force = 600N x 3 = 1800 Nm Therefore, on the other side, the see-saw must have a moment of 1800 Nm 1800/450 = 4

The force applied to a lever is called effort. In a lever system, the effort refers to the force that is exerted on one end of the lever to overcome the resistance or load on the other end. The effort force is what is used to move or balance the lever, making it an essential component in leveraging mechanical advantage.