Exam 1 TB Flashcards
The study of the time and space characteristics of movement is called?
Kinematics
The study of systems with no change in their state of motion is called?
Statics
The study of the force and energy factors associated with systems in motion is called?
Kinetics
Kinematics is the branch of mechanics that?
Describes the pattern of motion.
Which of the following could not be involved in a kinematic description of a tennis serve?
a. angular velocity
b. linear velocity
c. force
d. angular acceleration
e. all of the above
c. force
The primary focus of sport and exercise biomechanics is to?
Improve performance and reduce the risk of injury.
Interia is
A body’s resistance to having its state of motion changed.
Mass is an important quantity in kinetics because it quantifies
a. the rate of change of motion of a body
b. the quality of matter in a body
c. the net force acting on a body
d. the inertia of a body
e. none of the above
The inertia of the body
The process of taking all of the independent forces acting on an object and calculating the net force is termed?
Force composition or force resolution?
Force resolution.
A free body diagram displays
the forces acting on a body
If two forces lying in the same plane are added together and the result is zero, which of the following is true of the forces?
a. They are in opposite directions
b. They are equal in magnitude
c. Both a and b are true
d. None
c. Both a and b are true
The forces that acts perpendicular to an object in contact with a surface is called?
Normal force
The force that acts parallel to an object in contact with a surface is called?
Friction force
As the normal contact force increases, what happens to the friction force?
It increases
If a normal force of 500N is acting on two surfaces in contact with a coefficient of friction equal to 0.50, what would be the maximum force of static friction.
250N
As the surface area of two objects in contact increases (for instance laying a refrigerator on its side), what happens to the force of friction?
It remains constant.
How does mass differ from weight?
Weight is force and mass is the quantity of matter in a body.
Which objective is always desirable in human movement?
The amount of friction desired varies with the particular situation within a given activity.
To fully define a vector quantity, you must specify
A direction and a magnitude
Which of the following statements is true of the amount of horizontal force required to start in motion an object sitting on a horizontal surface?
It must be greater than the maximum static friction FORCE.