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KNS 422 Final Concepts Quiz
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Gravity
Terms in this set (45)
An increase in the radius of a rotating object will __________ its tangential (linear) velocity
Increase
The stiffer an object is, the greater its strain energy is when it is deformed, T or F?
True
The distance between one right step and the next left step is the __________
Step Length
To which component of a projectile's velocity does Newton's 1st Law apply?
Horizontal
Force per cross sectional area is know as what?
Stress
What is the ultimate goal of biomechanics?
Performance Improvement
If the force actions on the object is in the opposite direction of the object's motion (displacement) the mechanical work is _____________.
Negative
If the displacement of an object is 0, the work done on the object is_______________.
Zero
If the take of height is lower than the landing height, what is true about the flight time of the projectile?
Time up is GREATER than time down
An object's resistance to change in its state of motion is ___________.
Inertia
Which force describes the direction a rotating object would fly if released?
Centrifugal
If the static friction force is 100 N, how much force must be applied to cause the object to move?
More than 100 N
Which of Newton's laws explains what will happen if a net force acts on an object?
Newton's 2nd Law
How will an increase in velocity affect the momentum of an object?
Increase it
Which of Newton's Laws of Motion explains why the angular momentum of an object remains constant unless there is a net external torque acting on it?
Newton's 1st Law
A decrease in step length while keeping cadence constant will result in _________.
Decreased walking velocity
The vertical velocity of a projectile on its flight up _________.
Decreases
How will an increase in the surface area in contact affect the static friction?
It won't affect it
Which of Newton's Laws best explains why using a long pole during tightrope walking helps the acrobat maintain their balance?
Newton's 3rd Law
A force platform will best measure which type of force?
External, Contact
Why does the subtalar joint invert during terminal stance?
To make the foot more rigid for propulsion
Which is a scalar? Velocity, Mass, Acceleration
Mass
An increase in the normal contact force will increase the friction force T or F?
True
Any two points on a rotating object will experience the same relative angular displacements T or F?
True
If an object's velocity is constant, what is true about the net force acting on it?
= 0 N
An object makes 1 revolution in 1 second. Which of the following is true? 360 degrees, 6.28 rad/s, 57.3 rad/s
360 degrees, 6.28 rad/s
Which factor has the greatest impact on the horizontal distance a projectile travels? Take off speed, take off height, take off angle
Take off speed
When catching a pitched baseball, the glove does negative work to reduce the ball's kinetic energy T or F?
True
In a perfectly elastic collusion of objects of equal mass, the pre-collision total momentum will be equal to the post-collision total momentum T or F?
True
Impulse will increase momentum when impulse and momentum are in what direction?
Same
The horizontal velocity of a projectile is _________.
Constant
When tangential linear velocity is constant, centripetal acceleration and the radius are inversely related T or F?
True
When an object moves in a straight line and all points on that object move the same distance and direction it is ___________.
Rectilinear
At heel-strike during normal walking, the knee will be ___________________.
Close to maximum extension
Will a point on a rotating object experience a tangential (linear) acceleration if mu is constant and At = 0?
Yes
If torque is constant, an increase in the moment arm requires an increase in the force applied T or F?
False
Samantha runs 2 laps around a 400 m track. Danielle runs 1. What is true?
Samantha's distance traveled is greater, their displacements are equal
As a projectile falls to the Earth, what is true about its mechanical energy?
PE Decreases, KE increases, Total energy is constant
When the angular momentum of an object is constant, a decrease in its moment of inertia will results in what ___________?
An increase in its angular velocity
An increase in the radius of point on a rotating object will increase its linear distance traveled T or F?
True
It takes an equal amount of force to accelerate an object vertically as it does to accelerate it horizontally T or F?
False
When determining an object's moment of inertia, which has a greater effect?
Radius of gyration
The study and description of movement in space is called _____________.
Kinematics
An increase in the force applied to an object will increase its acceleration proportionally is Newton's _________ Law?
Newton's 2nd Law
The rate of doing mechanical work is known as_________________.
Power
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