Exam 1 Part 1

Question 1

What is the study of forces and their effects?

Answer 1

Mechanics

Question 2

What is the study of relationships between the force system acting on the body and the changes it produces in body motion?

Answer 2

Kinetics

Question 3

What is the branch of mechanics that deals with the geometry of the motion of objects?

Answer 3

Kinematics

Question 4

T/F: Kinematics includes things like displacement, acceleration, and velocity.

Answer 4

True

Question 5

What study uses principles of mechanics for solving problems related to structure and function of biologic and physiologic systems?

Answer 5

biomechanics

Question 6

T/F: Scalars consist of magnitude and direction.

Answer 6

False; vectors have both, scalars are magnitude only

Question 7

What are some examples of scalars?

Answer 7

temp, distance, speed, mass

Question 8

Examples of Vectors?

Answer 8

displacement, velocity, acceleration, momentum, and force

Question 9

What is the scalar quantity distance?

Answer 9

how much ground an object has covered during its motion

Question 10

What vector quantity is a measure of overall change of position or “how far out of place an object is”?

Answer 10

Displacement

Question 11

T/F: Velocity is ignorant of direction.

Answer 11

False; velocity is direction aware (displacement/time)

Question 12

What scalar quantity is ignorant of direction and is equal to distance/time?

Answer 12

Speed

Question 13

What term is defined as the change in velocity/time?

Answer 13

Acceleration

Question 14

T/F: Acceleration is a vector quantity.

Answer 14

True

Question 15

T/F: Mass is a scalar quantity.

Answer 15

True

Question 16

What vector quantity is equal to mass x acceleration and can be described as the quantity of motion an object possesses?

Answer 16

Momentum

Question 17

What unit is force measured in?

Answer 17

Newtons

Question 18

T/F: 10 Newtons= 1 Kilogram = 2.2 pounds

Answer 18

True

Question 19

What is the formula for Force?

Answer 19

Force=Mass x Acceleration

Question 20

Which of Newton’s Laws of Motion is aka the law of inertia?

Answer 20

First law

Question 21

Which of Newton’s laws states that an object at rest stays at rest and an object in motion stays in motion….?

Answer 21

1st

Question 22

Which of Newton’s laws is aka the law of force and acceleration?

Answer 22

2nd

Question 23

Which of Newton’s laws is aka the Law of action and reaction?

Answer 23

3rd

Question 24

What is the force that resists the sliding of two objects in contact?

Answer 24

friction

Question 25

T/F: Static friction exists when two surfaces are not sliding relative to one another but do possess the potential for movement.

Answer 25

True

Question 26

What has a higher coefficient of (static) friction, Rubber on concrete or synovial joints?

Answer 26

Rubber on concrete. Higher coefficient means more friction which means less movement.

Question 27

What is aka dynamic friction?

Answer 27

Kinetic Friction

Question 28

What kind of forces elongate or pull things apart?

Answer 28

Tensile forces

Question 29

What kind of forces compact an object?

Answer 29

Compressive forces

Question 30

What is the term for the magnitude of applied force acting over a given area? What is it measured in?

Answer 30

Pressure (P=F/A); | pascals

Question 31

What is performed when an object is displaced by the application of a force? What is it measured in?

Answer 31

Work; | Joules

Question 32

What is the amount of mechanical work performed in a given interval and is measured in watts?

Answer 32

Power (Work/Time)

Question 33

What is the term for the motion of one object with respect to a reference object?

Answer 33

Relative motion

Question 34

What are the 4 categories of movement?

Answer 34

Discrete, Continuous, Repeated discrete, and Serial

Question 35

What is the term for the path of motion around a fixed axis and therefore in a circular path?

Answer 35

Angular motion

Question 36

What is the perpendicular distance from an axis of rotation to a line along which a force acts?

Answer 36

Lever arm aka force arm or moment arm

Question 37

What is torque?

Answer 37

product of force and lever arm

Question 38

What does a lever system consist of?

Answer 38

a rigid or semi-rigid object (lever) that is capable of rotating about an axis (fulcrum)

Question 39

What type of lever system has the fulcrum in the middle?

Answer 39

Type 1

Question 40

What type of lever system has the fulcrum on one end of the lever and the effort on the opposite end?

Answer 40

Type 2

Question 41

What type of lever system has the fulcrum on one end of the lever and the resistance or load on the opposite end?

Answer 41

Type 3

Question 42

What is the point that represents the average location of a system's mass?

Answer 42

Center of mass

Question 43

What is the point at which the force of gravity seems to be concentrated?

Answer 43

Center of Gravity