Midterm

Question 1

True or False: The best way to mathematically represent a vector is force and direction.

Answer 1

False: Magnitude and Direction

Question 2

True or False: Two vectors in the same direction can be added together.

Answer 2

True

Question 3

True or False: You represent a vector on a graph by an arrow starting at the origin.

Answer 3

True

Question 4

True or False: An arrow is the only way to represent a vector on a graph.

Answer 4

False: Rectangular coordinates can also be used

Question 5

True or False: The vertical coordinate of a force at an angle is equal to amplitude.

Answer 5

False: Vertical Velocity, altitude, or velocity against gravity.

Question 6

True or false: The horizontal coordinate of a force of an angle is equal to the horizontal velocity.

Answer 6

True

Question 7

True or False: Newton’s first law is F=MA

Answer 7

False: An object in motion stays in motion and an object at rest stays at rest.

Question 8

True or False: Newton’s second law is F=MA

Answer 8

True

Question 9

True or False: Newton’s Third law is For every action there is an equal and opposite reaction.

Answer 9

True

Question 10

True or False: Inertia is the tendency to resist change in state.

Answer 10

True

Question 11

True or False: The less mass you have the more inertia you have

Answer 11

False: The more mass you have the more inertia.

Question 12

True or False: The more velocity you have the more inertia you have.

Answer 12

True

Question 13

True or False: If a weight is hanging from the ceiling and you pull slowly, the lower string will break.

Answer 13

False: the upper string.

Question 14

True or False: If a weight is hanging from the ceiling and you pull quickly, the lower string will break.

Answer 14

True

Question 15

True or False: Newton’s third law of motion is demonstrated when you break a car and your head hits the windshield.

Answer 15

False: Newton’s first law

Question 16

True or False: Kinetic friction is when there is enough force between the object and the surface it’s on to not move.

Answer 16

False: Static Friction

Question 17

True or False: Static Friction is when there I enough force to overcome the friction of the ground to move the object.

Answer 17

False: Kinetic Force

Question 18

True or False: All the force of the biceps muscle is used to move the elbow.

Answer 18

False: The force also is used to stabilize the joint.

Question 19

True or False: Potential energy is stored energy.

Answer 19

True

Question 20

True or False: Gasoline does not have potential energy.

Answer 20

False: Gasoline has potential energy

Question 21

True or False: An object in motion has kinetic energy.

Answer 21

True

Question 22

True or false: The slower the velocity, the greater the kinetic energy

Answer 22

False: faster the velocity

Question 23

True or false: The greater the mass the greater the kinetic energy.

Answer 23

True

Question 24

True or false: Kinetic energy involves mass and velocity.

Answer 24

True

Question 25

True or False: Momentum is mass X velocity.

Answer 25

True

Question 26

True or False: Work is a unit of power.

Answer 26

False: It's a unit of energy

Question 27

True or false: Work is force x distance

Answer 27

True

Question 28

True or false: Torque is used to measure linear motion.

Answer 28

False: Rotary motion

Question 29

True or False: Torque is force x distance

Answer 29

True

Question 30

True or False: The center of gravity for women is 2 inches above the hips.

Answer 30

False: It is at the hips

Question 31

True or False: The center of gravity of men is the same as women.

Answer 31

False: It's two inches above the hips

Question 32

True or false: A first order lever has the fulcrum in the middle.

Answer 32

True

Question 33

True or false: A second order lever has the load in the middle and an example is a see saw

Answer 33

False: Load is in the middle, but an example is a wheelbarrow.

Question 34

True or false: A third order lever has the force in the middle and gets little range of motion.

Answer 34

False: Third order lever gets a lot of range of motion.

Question 35

True or False: Biceps is an example of a first order lever.

Answer 35

False: third lever

Question 36

True or false: limits of stability is related to the center of gravity centered over the silhouette of the foot.

Answer 36

True

Question 37

True or false: The center of gravity is always within the body.

Answer 37

False: It can be outside.

Question 38

True or False: To stabilize a wheelchair the center of gravity should be behind the axil.

Answer 38

False: In front of the axil.

Question 39

True or false: Elasticity is when the object bends and stays bent, but doesn't break.

Answer 39

False: Plasticity

Question 40

True or false: Elasticity is when the material bends then returns to its original shape.

Answer 40

True

Question 41

True or false: The fracture point of a material is within the plastic region.

Answer 41

False: After

Question 42

True or false: Bone is very plastic.

Answer 42

False: Elastic not plastic

Question 43

True or False: The muscle keeps from tearing because of ligaments.

Answer 43

False: tendons

Question 44

True or False: A spiral fraction is because of twisting or rotation.

Answer 44

True

Question 45

True or False: Hylain cartilage protects the tendon by covering the bone during motion.

Answer 45

True

Question 46

True or False: Discs are elastic.

Answer 46

True

Question 47

True or False: discs do not lose their elasticity.

Answer 47

False: Get dehydrated and lose elasticity

Question 48

True or false: The center of rotation on an orthotic device should be right over the center of rotation of the knee.

Answer 48

True

Question 49

True or false: There is no center of rotation of the knee.

Answer 49

True

Question 50

True or False: Standing on your toes is a first class lever:

Answer 50

False: Second

Question 51

True or False: Muscle is a linear force generator

Answer 51

False: Nonlinear

Question 52

True or False: Pennet muscle generates more force then long ranged fibers

Answer 52

True