Angular Kinematics Exam Review

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Questions and Answers

What is the angular displacement formula expressed mathematically?

$\omega = \frac{\theta}{t}$ (correct)

$\theta = \frac{d}{r}$ (correct)

$v_T = \omega \times r$

$d = \theta \times r$

In angular kinematics, counter-clockwise motion is considered negative.

False (B)

What does the right-hand-thumb rule help determine in angular kinematics?

The direction of angular displacement or angular velocity.

Angular velocity is calculated using the formula ____ = angular displacement/change in time.

ω Signup and view all the answers

Match the following terms in angular kinematics with their definitions:

Angular distance (φ) = Total rotation angle in radians, degrees, or revolutions Angular displacement (θ) = Change in position of an object from its initial to final angle Tangential velocity (vT) = Linear speed of an object moving along a circular path Radius (r) = Distance from the center of rotation to the point of interest Signup and view all the answers

Which of the following statements about velocity is true?

Angular velocity is greater for longer radii when tangential velocity is equal. (B), Objects with a shorter radius can achieve a higher angular velocity. (D) Signup and view all the answers

The unit of force is measured in Pascals.

False (B) Signup and view all the answers

What formula is used to calculate angular acceleration?

α = (ωf – ωi)/t Signup and view all the answers

Momentum is the product of mass and ______.

velocity Signup and view all the answers

Match the types of friction with their descriptions:

Static Friction = Force preventing motion between two stationary objects Kinetic Friction = Force opposing motion between moving objects Rolling Friction = Resistance encountered when an object rolls over a surface Fluid Friction = Resistance experienced by objects moving through a liquid or gas Signup and view all the answers

Which statement about collisions is correct?

Momentum is conserved in all types of collisions. (B) Signup and view all the answers

The pressure formula is given by P = Area/Force.

False (B) Signup and view all the answers

What is the formula for impulse?

Impulse = Ft Signup and view all the answers

What is torque defined as?

Force multiplied by the distance from the axis of rotation (B) Signup and view all the answers

The moment of inertia (I) is calculated only by mass and does not take into account the distribution of that mass.

False (B) Signup and view all the answers

What defines a 3rd class lever?

The force is applied between the axis and the resistance. Signup and view all the answers

The conservation of angular momentum implies that the total angular momentum of a given system remains constant in the absence of __________.

external torques Signup and view all the answers

Which factor most significantly affects angular momentum?

Distribution of mass (C) Signup and view all the answers

Match the levers with their characteristics:

1st Class = Force and Resistance on opposite sides of the axis 2nd Class = Resistance is in the middle 3rd Class = Force is in the middle Levers in general = Consist of Axis, Force, and Resistance Signup and view all the answers

Mechanical advantage increases as the resistance arm (RA) increases relative to the force arm (FA).

False (B) Signup and view all the answers

What equation represents the mechanical advantage (MA) of a lever?

MA = FA/RA Signup and view all the answers

The quantity of angular inertia is quantified as __________.

moment of inertia Signup and view all the answers

In angular kinetics, which of the following is true about the force arm (FA)?

It is the distance from the axis to the point where the force is applied. (A) Signup and view all the answers

Which principle states that any body in a fluid will experience a buoyant force equal to the weight of the volume of the fluid it displaces?

Archimedes' principle (D) Signup and view all the answers

Turbulent flow describes fluid layers that move smoothly and predictably.

False (B) Signup and view all the answers

What does viscosity refer to in the context of fluid dynamics?

Resistance to flow Signup and view all the answers

The principle that describes how drag increases with the square of the relative velocity of motion is known as the _______ square law.

theoretical Signup and view all the answers

Match the types of drag with their descriptions:

Form drag = Affected by the area on which the fluid acts Surface drag = Affects moving objects due to skin friction Wave drag = Only felt in water, increases with faster movement Lift = Acts at right angles to the relative flow Signup and view all the answers

Which factor does NOT directly affect surface drag?

Density of the fluid (B) Signup and view all the answers

The center of buoyancy is the point at which buoyant forces act, and it coincides with the center of gravity.

False (B) Signup and view all the answers

What is the relationship between the duration of force and the velocity of an object?

Increase duration of constant force increases velocity Signup and view all the answers

The coordination of body segments moving together simultaneously usually aims for ______ or force.

accuracy Signup and view all the answers

What factor influences the buoyancy of an object in a fluid?

Volume of fluid displaced (C) Signup and view all the answers

Flashcards

Angular displacement

The angle through which a point on a rotating body moves. Measured in radians (rad), degrees (°), or revolutions (rev).

Angular velocity (ω)

The rate of change of angular displacement. Calculated as angular displacement over time.

Tangential velocity (vT)

The linear velocity of a point on a rotating body. Calculated as angular velocity times the distance from the rotation axis.

Radians

A unit of angular measure. One radian is the angle subtended by an arc equal in length to the radius of the circle.