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

Reviewed by Matt Balanda
Matt Balanda, BS, Science |
Physics Expert
Review Board Member
Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.
, BS, Science
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In this "Physics Test: Practice Questions On Moments, Levers, And Gears!" on the scientific topic of physics, we'll be taking a look at the moment of force – which is defined as the measure of its tendency to cause a body to rotate about a specific point of axis. One example you might find easiest to wrap your head around is the see-saw. Think of what causes the see-saw to balance and what tilts it to either side. What do you know about these moments? Take this quiz and find out.

• 1.

### 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.

• A.

True

• B.

False

A. True
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.

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• 2.

### Another name for a pivot is a

• A.

Falcon

• B.

Tool

• C.

Fulcrum

• D.

None of these

C. Fulcrum
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.

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• 3.

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

• A.

Clockwise Moment

• B.

Weight

• C.

Mass

• D.

None

A. 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.

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• 4.

### Moment is the

• A.

Turning effect of a force

• B.

Airflow

• C.

Mass

• D.

Weight

A. Turning effect of a force
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.

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• 5.

### What's the unit of the moment?

• A.

Km

• B.

Nk

• C.

Kn

• D.

Nm

D. Nm
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.

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• 6.

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

• A.

True

• B.

False

A. 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.

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• 7.

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

• A.

True

• B.

False

B. False
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).

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• 8.

### 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?

• A.

2m

• B.

4m

• C.

6m

• D.

3.5m

• E.

3m

B. 4m
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

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• 9.

### The force applied to a lever is called?

• A.

Force

• B.

Mass

• C.

Effort

• D.

Torque

C. Effort
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.

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Matt Balanda |BS, Science |
Physics Expert
Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.

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• Nov 30, 2023
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• Apr 22, 2012
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