Review 3 (Kinetics Concepts) Flashcards by Keeboon Ng

Which of the following will reduce the pressure of a baseball against a catcher’s hand?

Question options:

1) Reduce the force with which the ball is thrown

2) Wear a catcher’s mitt

3) Both reduce the force with which the ball is thrown and wear a catcher’s mitt

4) None of the choices is correct.

Both reduce the force with which the ball is thrown and wear a catcher’s mitt

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A free body diagram includes which of the following?

Question options:

1) Sketch of an object, body, or body part being analyzed

2) Vectors representations of all forces acting on the system

3) Both choices are included in a free body diagram.

4) Neither of the above is included in a free body diagram.

Both choices are included in a free body diagram.

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Mechanical stress in the lumbar vertebrae is less than expected because of which of the following structural details?

Question options:

1) Bears more weight or force than other vertebrae

2) Larger weight-bearing surface area than other vertebrae

3) Both bears more weight or force than other vertebrae and larger weight-bearing surface area than other vertebrae.

4) None of the above

Larger weight-bearing surface area than other vertebrae

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Which of the following is true regarding a shot put and a softball of equal diameter?

Question options:

1) They have the same density.

2) They have the same volume.

3) Both A and B

4) None of the above

They have the same volume.

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When 2 force vectors are acting parallel and in the same direction, how do you compose them into one vector?

Question options:

1) Resolve them

2) Subtract them

3) Divide them

4) Add them

Add them

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When you wear a backpack, your center of gravity shifts in which direction?

Question options:

1) Up

2) Forward

3) Up and back

4) Back

Up and back

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Which of the following is a correct unit of torque?

Question options:

1) Ns

2) kg m

3) N-m

4) N/s

N-m

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The rotary effect created by an eccentric force defines which of the following?

Question options:

1) Moment of force

2) Torque

3) All of the above

All of the above
(Moment of force) , (Torque)

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Which of the following is not true about mass?

Question options:

1) Affects force production

2) Measurement unit = kg

3) Changes depending on gravity

4) Quantity of matter

Changes depending on gravity

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If two vectors lying in the same plane are added together and the result is zero, then which of the following is true of the vector quantities?

Question options:

1) They are equal in magnitude.

2) They are opposite in direction.

3) Both A and B

4) None of the above

Both A and B
(They are equal in magnitude) & (They are opposite in direction)

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Which of the following is the angular equivalent of linear force?

Question options:

1) Stress

2) Torque

3) Pressure

4) Tension

Torque

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When absorbing the force of a baseball, which of the following will change the impulse?

Question options:

1) Reduce the force with which the ball is thrown

2) Wear a catcher’s mitt

3) “Give” with the ball when catching

4) All of the above

All of the above
(Reduce the force with which the ball is thrown) , (Wear a catcher’s mitt) , (“Give” with the ball when catching)

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Which of the following is a correct unit of inertia?

Question options:

1) psi

2) lg/m^3

3) lb/ft^3

4) None of the above

None of the above

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Which of the following defines center of gravity?

Question options:

1) Intersection of the 3 cardinal planes

2) The point around which a body’s weight is equally balanced regardless of body position

3) Both A and B

4) None of the above

Both A and B
(Intersection of the 3 cardinal planes) & (The point around which a body’s weight is equally balanced regardless of body position)

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Which of the following types of force act parallel to a surface?

Question options:

1) Compression

2) Shear

3) Tension

4) All of the above

Shear

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Scalar quantities and vector quantities have which of the following properties in common?

Question options:

1) Magnitude

2) Direction

3) Both A and B

4) None of the above

Magnitude

Which of the following statements is true?

Question options:

1) Pressure is synonymous with weight.

2) Pressure is synonymous with force.

3) Force is always a weight.

4) Weight is always a force.

Weight is always a force.

Which of the following statements is/are true regarding density?

Question options:

1) Muscle tissue is more dense than fat tissue.

2) Specific weight is proportional to density.

3) Both A and B

4) None of the above

Both A and B
(Muscle tissue is more dense than fat tissue) & (Specific weight is proportional to density)

Which of the following is a correct unit of pressure?

Question options:

1) slugs

2) kg/cm^2

3) Newtons

4) N/cm^2

N/cm^2

Which of the following types of force exerts a pull on the body as in muscle contraction?

Question options:

1) Compression

2) Shear

3) Tension

4) All of the above

Tension

In a free body diagram of the human body, which direction would the vector representing weight of the body point?

Question options:

1) Down

2) Depends on body orientation

3) Up

4) Not possible to determine

Down

Which of the following quantities is calculated the same as pressure?

Question options:

1) Shear

2) Strain

3) Tension

4) Stress

Stress

Which of the following is NOT true about weight?

Question options:

1) Measurement unit = kg

2) Weight is a force

3) Changes depending on gravity

4) Measurement unit = kg m s^-2

Measurement unit = kg

Which of the following characteristics of a vector represents magnitude?

Question options:

1) Its angle of orientation

2) Its direction

3) Its length

4) All of the above

Its length

Which of the following is a scalar quantity? Question options: 1) Force 2) Mass 3) Velocity 4) All of the above

Mass

When injury results from a single large force application, such as a tackle, the injury is usually termed what? Question options: 1) Acute 2) Chronic 3) Repetitive 4) All of the above

Acute

Stress fractures result from which of the following types of loading? Question options: 1) Acute loading 2) Repetitive loading 3) Both A and B 4) None of the above

Repetitive loading

A bending load will produce which of the following types of stress? Question options: 1) Torsion 2) Tension 3) Both compression and tension 4) Compression

Both compression and tension

Which of the following statements is/are true? Question options: 1) Increasing the surface area over which a force is distributed increases the amount of stress acting on the surface. 2) Decreasing the surface area over which a force is distributed increases the amount of stress acting on the surface. 3) Both A and B 4) None of the above

Decreasing the surface area over which a force is distributed increases the amount of stress acting on the surface.

Which of the following occurs when a bone is caused to twist about the longitudinal axis? Question options: 1) Compression 2) Tension 3) Torsion 4) None of the above

Torsion

The formula for torque includes force and which other variable? Question options: 1) Force arm 2) Moment arm 3) Perpendicular distance from the axis of rotation 4) All of the above

All of the above (Force arm) , (Moment arm) , (Perpendicular distance from the axis of rotation)

When muscles on opposite sides of a joint develop tension, which determines the direction of joint movement? Question options: 1) Muscle flexibility 2) Muscle strength 3) Net torque 4) None of the above

Net torque

The "quantity of matter composing a body" defines which of the following? Question options: 1) Inertia 2) Weight 3) Momentum 4) Mass

Mass

Which of the following relationships is correct? Question options: 1) a = m / F 2) F = m / a 3) m = F / a 4) None of the relationships is correct.

m = F / a

Inertia is directly proportional to which quantity(s)? Question options: 1) Acceleration 2) Force 3) Mass 4) All of the above

Mass

In a free body diagram of the human body, where would the vector representing weight of the body originate? Question options: 1) Need more information 2) Center of gravity 3) Contact between the feet and the ground 4) Head

Center of gravity

Which of the following is true regarding electromyography? Question options: 1) Measures the electrical activity produced by a muscle 2) Treats muscle injury with electrical impulses 3) Both A and B 4) None of the above

Measures the electrical activity produced by a muscle

Which of the following types of force exerts a squeezing effect on the body? Question options: 1) Compression 2) Shear 3) Tension 4) All of the above

Compression

Which of the following statements is/are true regarding vector algebra? Question options: 1) In vector resolution, when a vector is resolved into two components, they are always perpendicular. 2) In vector composition, only perpendicular components can be composed into a resultant. 3) Both A and B 4) None of the above

In vector resolution, when a vector is resolved into two components, they are always perpendicular.