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

1. Moment is the

Turning effect of a force

Airflow

Mass

Weight

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.

Explanation

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.

2. For a see-saw to balance, the anti-clockwise moment must equal the ________________

Clockwise Moment

Weight

Mass

None

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.

Explanation

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.

3. Newtons (N) is the unit of force.

True

False

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.

Explanation

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.

4. A see-saw is like a lever, turning around a pivot, also called a fulcrum. A lever is a simple machine that amplifies the effort force.

True

False

A see-saw balances when the anti-clockwise moment (turning effect) is equal to the clockwise moment. This is because a see-saw is like a lever that pivots around a fulcrum. A lever is a simple machine that amplifies the effort force. Therefore, for a see-saw to balance, the moments on both sides of the fulcrum must be equal.

Explanation

A see-saw balances when the anti-clockwise moment (turning effect) is equal to the clockwise moment. This is because a see-saw is like a lever that pivots around a fulcrum. A lever is a simple machine that amplifies the effort force. Therefore, for a see-saw to balance, the moments on both sides of the fulcrum must be equal.

5. What's the unit of the moment?

Km

Nk

Kn

Nm

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.

Explanation

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.

6. Another name for a pivot is a

Falcon

Tool

Fulcrum

None of these

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.

Explanation

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.

7. A SEE-SAW. On one side, there is a person with a weight of 600N. He is sitting 3m away from the pivot. On the other side is a person weighing 450N. How far away must (s)he sit?

2m

4m

6m

3.5m

3m

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

Explanation

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

8. Newtons (K) is the unit of weight.

True

False

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).

Explanation

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).

9. Connect the opposite sides of the see-saw. Make the see-saw balance.

400N, 3m from the pivot

1000N, 1.5m from the pivot

600N, 3m from the pivot

500N, 5m from the pivot

Submit

10. The force applied to a lever is called?

Force

Mass

Effort

Torque

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.

Explanation

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.