BIOMECH 3 USE but dont trust too much

Which of the following is not a component of Hill's muscle model?

series of viscous component

Electromechanincal delay (EMD), the time gap between the arrival of neural stimulus (or onset of muscle contraction) and the actual tension development by the muscle, is caused by ___ of the musculotendinous unit.

The series elastic component (SEC)

Which of the following statements about muscular power is incorrect?

Individuals with predominance of slow-twitch (ST) fibers (motor units) generate more power at a given load than individuals with high percentage of fast-twitch (FT) composition since ST fibers are characterized by slower but higher maximal tension

Over 95% of the joints found in the human body form _________, which are characterized by disadvantage in force but advantage in motion (displacement or velocity)

3rd class levers

______ compose the contractile component (CC) of the muscle model.

Actin and Myosin filaments

Which of the following statements about the moment arm is incorrect?

Moment arm of a muscle becomes minimum when its angle of pull is 90 degrees

In human-machine systems, _____________ as motors

skeletal muscle

In slow flexion/extension of the elbow in the arm curl exercise, with a dumbbell on the hand, _______ are the agonists

elbow flexors

Which of the following is not a role assumed by skeletal muscles?A) AgonistB) EqualizerC) StabilizerD) Antagonist

B) Equalizer

The order of motor unit recruitment during an activity is ________.

SO > FOG > FG

_____ in rotary force produced by an eccentric force and is the cause of angular motion

Torque

______ is a simple form motion in which the object rotates about an axis

Angular motion

Which of the following joint-DOF combinations is incorrect?

Gliding-1

Which of the following is NOT a basic property of the musculotendinous (muscle tendon) unit?

repeatability

The area of study in biomechanics that deals with the description of motion is?

Kinematics

A vector quantity has both _____ and ________

magnitude and direction

Which of the following is not a kinematic quantity?

force

Which of the following statements about angular motion is incorrect?

A counterclockwise rotation gives a negative angular displacement

_____ is the tendency of an object to maintain it current state of motion, or the difficulty in chainging the current state of motion

inertia

Which of the following statements about linear velocity is incorrect?

A negative vertical velocity means the object is moving downwards

A driver is on the 10-m platform. Which of the following statements about mechanical energy is incorrect?

The mechanical energy increases as the driver moves downward

A 90-kg ice hockey player collides head-on with an 80-kg player. If the first player exerts force of 450N on the second player, the second player exerts a force of _______N to the first player simultaneously.

450

Angular momentum of an object is the product of and angular velocity

moment of inertia

_____ the amount of motion is the product of mass of the object and its velocity and is primarily related to giving or receiving of impact (collision)

momentum

The mechanical energy of an object due to its vertical position is the _____ energy

potential

Which of the following statements about center of gravity (CG) is incorrect?

The CG is always located in the inside of the body

The point around which the weight of a body is balanced in all direction is?

center of gravity

A 883-N high jumper exerts a force of 3,000N against the ground during takeoff. How much force is exerted by the ground on the high jumper?

3,000N

Which of the following statements about friction coefficient is incorrect?

since the rolling coefficient is much larger

The procedure to build a vector from perpendicular component is vector _______

resolution

Which of the following statements about work is incorrect?

Work is a vector quantity

180 is = to _____ rad

Pie

_______ is primarily related to the force required to initiate the motion of an object.

static friction coefficient

In the case of eccentric contraction of a muscle. The mechanical work done is ______

negative

Which of the following statements about linear acceleration is incorrect?

When the instantaneous acceleration is 0, the velocity should be 0

A 55-kg diver is in her swan dive. If she is at 7.5m above the water level with her velocity being 5m/s. What is her kinetic energy?

6744.375 J

The mass of a 735-N person is kg

74.949

____ is the accumulated effect of force exertion on a body over time. When this acts on a system, the total momentum of the system changes accordingly

impulse

Velocity is the ____ divided by the elapsed time while seep is ____ divided by the elapsed time

displacement, distance

T or F: If there is no external force acting on a system, the total linear momentum remains constant

True

T or F: If a diver goes from a full layout position to a pike position in the air, the angular momentum of the diver increases

True

T or F: If angular acceleration is constant (non-zero), then angular velocity must be increasing or decreasing

True

T or F: An orienteer shows two consecutive displacement of 100m and 150m. The magnitude of the overall (resultant) displacement is 250m.

False

T or F: Slowing down in the negative direction (leftward or downward) yields a negative acceleration

True

T or F: The amount of mechanical work done while catching a 13kg ball traveling at a velocity of 40 m/s is 1.040 J

False

T or F: The magnitude of the gravitation is proportional to the product of the masses of the two bodies, and linearly proportional to the separation distance between the objects.

False

T or F: When an object is motionless, the static friction is equal to the force exerted.

True

T or F: Carl Lewis changes his velocity from 8 m/s to 11 m/s in a 100-m race. Michael Johnson changes from 7 m/s to 10 m/s in a 400m race. Since they have the same changes in velocity, their accelerations must be equal.

False

T or F: The direction of the friction is opposite to the direction of motion or motion tendency and its magnitude is inversely proportional to the normal reaction force.

False