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Phycics: A-Level AQA > Moments > Flashcards

Moments Flashcards

1
Q

What is the definition of a moment in physics?

A

A moment is the measure of the tendency of a force to rotate an object about an axis.

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2
Q

What is the formula for calculating the moment?

A

Moment = Force x Distance from the pivot.

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3
Q

True or False: The unit of moment in the SI system is Newton-meter (Nm).

A

True

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4
Q

Fill in the blank: The moment is also known as the ________.

A

torque

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5
Q

What does the distance refer to in the moment formula?

A

The perpendicular distance from the line of action of the force to the pivot point.

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6
Q

If a force of 10 N is applied 2 m from the pivot, what is the moment?

A

20 Nm

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7
Q

What is the principle of moments?

A

For an object in equilibrium, the sum of clockwise moments about a pivot equals the sum of anticlockwise moments.

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8
Q

True or False: A moment can exist without a force.

A

False

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9
Q

What is the moment of a 15 N force applied at a distance of 3 m from the pivot?

A

45 Nm

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10
Q

In what scenario would a moment be zero?

A

When the line of action of the force passes through the pivot.

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11
Q

Multiple Choice: Which of the following is NOT a factor affecting the moment? A) Force magnitude B) Distance from pivot C) Type of material D) Angle of application

A

C) Type of material

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12
Q

What happens to the moment if the distance from the pivot is doubled?

A

The moment is also doubled, assuming the force remains constant.

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13
Q

True or False: Moments can be added algebraically.

A

True

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14
Q

What is the moment caused by a 50 N force acting at a 4 m distance from the pivot?

A

200 Nm

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15
Q

Fill in the blank: The point around which moments are calculated is called the ________.

A

pivot

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16
Q

If a moment is 30 Nm and the distance from the pivot is 5 m, what is the force applied?

A

6 N

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17
Q

Multiple Choice: Which equation represents the equilibrium condition for moments? A) ΣF = 0 B) ΣM = 0 C) F = ma D) v = u + at

A

B) ΣM = 0

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18
Q

True or False: The direction of the moment depends on the direction of the applied force.

A

True

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19
Q

What is the effect of applying a force at an angle to the lever arm?

A

The effective moment is reduced, calculated as Moment = Force x Distance x sin(θ).

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20
Q

If two equal forces are applied at equal distances on opposite sides of a pivot, what is the net moment?

A

Zero

21
Q

What is a couple in terms of moments?

A

A couple consists of two equal and opposite forces acting at a distance apart, creating a moment.

22
Q

True or False: Increasing the force will always increase the moment.

A

True

23
Q

Fill in the blank: The moment of inertia is a measure of an object’s ________ to rotational motion.

A

resistance

24
Q

What is the relationship between moment and angular momentum?

A

Moment is the rate of change of angular momentum.

25
Q

Multiple Choice: Which of the following best describes a lever? A) A type of force B) A simple machine C) A type of energy D) A unit of measurement

A

B) A simple machine

26
Q

What is the moment produced by a force of 25 N applied at a distance of 0.5 m from the pivot?

A

12.5 Nm

27
Q

True or False: The moment can be negative.

A

True

28
Q

If a force of 40 N is applied at an angle of 30 degrees to the lever arm of 2 m, what is the moment?

A

20 Nm

29
Q

What is the effect of increasing the distance from the pivot on the moment?

A

It increases the moment.

30
Q

Fill in the blank: The lever arm is the ________ distance from the pivot to the line of action of the force.

A

perpendicular

31
Q

What is the moment produced by a 100 N force acting at an angle of 90 degrees at a distance of 2 m?

A

200 Nm

32
Q

Multiple Choice: Which of the following does NOT affect the moment? A) Distance B) Force C) Mass D) Angle of force

A

C) Mass

33
Q

True or False: The sum of moments about any point is equal to zero when the object is in equilibrium.

A

True

34
Q

What is the moment when a 10 N force is applied 1.5 m from the pivot?

A

15 Nm

35
Q

Fill in the blank: The moment is also referred to as the rotational ________.

A

force

36
Q

How does changing the angle of application of a force affect the moment?

A

It changes the effective distance, thus affecting the moment.

37
Q

What is a uniform beam in the context of moments?

A

A beam with a constant mass distribution, where the center of mass is at its midpoint.

38
Q

Multiple Choice: The moment of a force that is perpendicular to the lever arm is greatest at which angle? A) 0 degrees B) 45 degrees C) 90 degrees D) 180 degrees

A

C) 90 degrees

39
Q

What is the effect on moment if the force is halved while the distance remains unchanged?

A

The moment is also halved.

40
Q

Fill in the blank: The moment acting on a body determines its ________ about a pivot.

A

rotation

41
Q

True or False: A moment can cause an object to accelerate in a linear direction.

A

False

42
Q

What is the moment of a 12 N force acting at a distance of 4 m from the pivot?

A

48 Nm

43
Q

Multiple Choice: Which device uses the principle of moments? A) Pulley B) Lever C) Wheel D) All of the above

A

D) All of the above

44
Q

What is the moment created by a 5 N force applied at a distance of 0.2 m?

A

1 Nm

45
Q

Fill in the blank: For an object to be in rotational equilibrium, the ________ of moments must be balanced.

A

sum

46
Q

True or False: The moment can be calculated using both the force and the distance from the pivot.

A

True

47
Q

What is the unit of measurement for moment in the imperial system?

A

Foot-pound (ft-lb)

48
Q

What is a common application of moments in engineering?

A

Designing beams and structures to ensure they can support loads without collapsing.

Phycics: A-Level AQA (6 decks)

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