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4th grading > Physics (4th) > Flashcards

Physics (4th) Flashcards

1
Q

The measure of the force that can cause an object to rotate about an axis.

A

Torque

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2
Q

Torque is also called a?

A

Moment of a force

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3
Q

In torque, the force applied to the body should be __________ to the moment arm or lever arm in order for torque to take place.

A

Perpendicular

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4
Q

This is the perpendicular distance from the axis of rotation to the line of action

A

Lever arm

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5
Q

Lever arm is also called a?

A

Moment arm

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6
Q

What is the symbol for torque and its unit?

A

T
N.m

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7
Q

Torque and force has a?

A

Direct relationship

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8
Q

Torque and lever arm/moment arm has?

A

Direct relationship

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9
Q

Force and lever arm/moment arm has?

A

Inverse/indirect relationship

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10
Q

If it rotates counter-clock wise it is?

A

Positive torque

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11
Q

If it rotates clock wise it is?

A

Negative torque

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12
Q

This is commonly used term in sports. An object with ______ is going to be hard to stop

A

Momentum

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13
Q

What is the symbol for momentum?

A

small “p”

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14
Q

What is the unit of momentum?

A

kg.m/s or N.s (Newton seconds)

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15
Q

Momentum is a vector or scalar quantity?

A

Vector

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16
Q

mass, velocity, and momentum has a?

A

Directly proportional/direct relationship

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17
Q

Mass and velocity has?

A

Inverse relationship/indirect

18
Q

Momentum can be applied in real life like?

A

car safety.

19
Q

This is the amount of force applied in certain amount of time to cause a change in momentum

A

Impulse

20
Q

What is the symbol for impulse?

A

Big letter “I”

21
Q

What is the unit for impulse?

A

Kg.m/s or Ns

22
Q

What is the real life application of impulse?

A

Seat belt
Airbag

23
Q

In a collision, an object experiences a force for a specific amount of time that results on a change in momentum. The results of the force action for the given amount of time is that the object’s mass either speeds up or slows down (or changes direction).

A

Impulse-momentum theorem

24
Q

a substance that continually deforms (flow) under an applied shear stress or external force.

A

Fluid

25
Q

Is concerned with the motion of the bodies under the action of forces including special case when the body remains at rest.

A

Mechanics

26
Q

it is the field in physics that studies the motion and properties of static fluids.

A

Fluid mechanics

27
Q

A material defined as the ratio of its mass(m) and volume(v).

A

Density

28
Q

What is the unit for density?

A

kg/m^3 (m/V)

29
Q

A substance is defined as the ratio of the density of the substance and the density of water at 4 degrees celsius.

A

Specific Gravity (SG)

30
Q

SG dont have a

A

unit

31
Q

Formula for SG is?

A

psub/pwater (Density of substance / density of water [1g/ml or 1/cm^3)

32
Q

This is known for as the amount of force applied per unit area

A

Pressure

33
Q

What is the unit for pressure?

A

N/m^2 or Pa

34
Q

“If an external pressure is applies to a confined fluid, the pressure at every point within the fluid increases by the same amount”

A

Pascal’s Principle

35
Q

What are the types of flow?

A

Laminar and turbulent flow

36
Q

It’s a smooth flow?

A

Laminar flow

37
Q

It is chaotic flow?

A

turbulent flow

38
Q

When an object is completely is partially immersed in a fluid exert an upward (Buoyant) force on the object that is equal to the weight of the fluid displaced by the object.

A

Buoyancy and Archimedes’ Principle

39
Q

In fluid dynamics, the continuity equation states that the rate at which mass enters a system is equal to the rate at which mass leaves the system; plus the accumulation of mass within the system.

A

Equation of Continuity

40
Q

Increasing the lever arm will result to?

A

Increase of torque

41
Q

The impulse-momentum relationship is direct result of?

A

Newton’s second law

42
Q

This is the study of fluids in motion?

A

Fluid dynamics

4th grading (4 decks)

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