Deck 12: Linear Kinetics of Human Movement

Question 1

The principle of conservation of momentum restates which of Newton's laws?

A)inertia
B)acceleration
C)action/reaction
D)gravitation

Answer 1

inertia

Question 2

Which of the following is true of the coefficient of restitution of a racquetball?

A)it depends solely on the type of material of which the ball is made
B)it depends on the size of the ball as well as the type of material
C)it depends solely on how hard the ball is hit
D)it is a number relating to the elasticity of a ball against a particular surface

Answer 2

it is a number relating to the elasticity of a ball against a particular surface

Question 3

The higher the jump,the "harder" the landing. This statement reflects which of the following laws?

A)the law of inertia
B)the law of momentum
C)the law of torque
D)the law of action-reaction

Answer 3

the law of action-reaction

Question 4

Which of the following correctly describes impact?

A)large force applied over a long period of time
B)large force applied over a short period of time
C)small force applied over a long period of time
D)small force applied over a short period of time

Question 5

Energy of motion is also called what?

A)potential energy
B)kinetic energy
C)strain energy
D)elastic energy

Question 6

The product of a force and the time during which it acts defines what?

A)momentum
B)velocity
C)acceleration
D)impulse

Question 7

Which of the following relationships is correct?

A)m = F / a
B)F = m / a
C)a = m / F
D)none of these answers is correct

Question 8

What variable may be described as "the quantity of motion" possessed by an object?

A)force
B)inertia
C)momentum
D)velocity

Question 9

Which of the following mechanical quantities is not dependent on time?

A)potential energy
B)power
C)kinetic energy
D)velocity

Question 10

If an object of constant mass travels with a constant velocity,which statement is true?

A)momentum is constant
B)acceleration is 0
C)both momentum is constant and acceleration is 0
D)none of these answers is correct

Question 11

Which quantity is not a force?

A)friction
B)mass
C)weight
D)gravity

Question 12

Which of the following pairs of quantities are expressed in the same units of measure?

A)friction and weight
B)work and energy
C)both friction and weight and work and energy
D)neither friction and weight nor work and energy

Question 13

The 2 variables that determine momentum are

A)velocity and time.
B)velocity and mass.
C)mass and acceleration.
D)velocity and acceleration.

Question 14

Which of the following mechanical quantities is evident in explosive track and field events,such as the long jump and the shot put?

A)kinetic energy
B)potential energy
C)mechanical work
D)mechanical power

Question 15

Which of the following is a correct unit of mechanical energy?

A)joules
B)watts
C)kg-m
D)kg/m

Question 16

A skater gliding on ice will continue to move in the same direction and with the same speed (in the absence of the action of additional forces). This exemplifies which of the following laws?

A)Newton's first law of inertia
B)Newton's second law of acceleration
C)Newton's third law of action/reaction
D)Newton's law of gravitational force

Question 17

The capacity for doing work that a body possesses because of its height or position is called what?

A)potential energy
B)kinetic energy
C)moment of inertia
D)mechanical power

Question 18

When two bodies collide head-on and then continue to travel collectively in the original direction of motion of one of the bodies,what factor determines the direction of collective motion after the collision?

A)the relative moments of the two bodies
B)the relative masses of the two bodies
C)the relative acceleration of the two bodies
D)the relative weights of the two bodies

Question 19

A 500 N gymnast performing a giant swing with an angular velocity of 5 rad/sec,exerts 90 Nm of torque on the support bar. How much torque is exerted by the bar on the gymnast's hands?

A)100 Nm
B)2500 Nm
C)590 Nm
D)90 Nm

Question 20

What determines the time a horizontally projected object remains in the air?

A)weight
B)mass
C)projection height
D)all of these answers are correct

Question 21

Choose the term that describes the product of force and the time interval over which the force acts.

A)impulse
B)kinetic energy
C)kinetic friction
D)linear momentum

Question 22

Which of the following is closest to a perfectly elastic impact?

A)modeling clay dropped on a hard surface
B)modeling clay dropped on a trampoline
C)superball dropped on a hard surface
D)superball dropped on a trampoline

Question 23

Negative mechanical work involves which of the following?

A)net torque and angular motion are same direction
B)net torque and angular motion are in different directions
C)concentric muscle contraction
D)none of these answers is correct

Question 24

What type of energy is strain energy?

A)potential
B)kinetic
C)caloric
D)entropic

Question 25

How does wearing gloves increase the friction between the hands and the bat?

A)changes μ_k
B)changes μ_s
C)changes R
D)friction is not increased

Question 26

Which of the following is a correct unit for linear momentum?

A)N•m
B)N•m/s
C)kg•m
D)kg•m/s

Question 27

Choose the term that describes the force acting perpendicular to two surfaces in contact.

A)maximum static friction
B)normal reaction force
C)perfectly elastic impact
D)perfectly plastic impact

Question 28

Which of the following affects the coefficient of restitution between a tennis racket and tennis ball?

A)how long the ball has been out of the can
B)how many times the ball has been hit
C)tightness of the grip
D)both how long the ball has been out of the can and how many times the ball has been hit
E)all of these answers are correct

Question 29

Which of the following statements is true of the amount of horizontal force required to start an object sitting on a horizontal surface in motion?

A)it must be greater than the coefficient of kinetic friction
B)it must be greater than the coefficient of static friction
C)it must be greater than the maximum static friction force
D)it must be greater than the maximum kinetic friction force

Question 30

Choose the term that describes the quantity of linear motion.

A)impulse
B)kinetic energy
C)kinetic friction
D)linear momentum

Question 31

Which of the following statements is true about the relationship between impact and impulse?

A)impact is always greater than impulse
B)impulse is always greater than impact
C)impacts generate impulses
D)impulses generate impacts

Question 32

Which of the following factors does not affect the amount of friction generated between two dry surfaces?

A)the coefficient of friction between the two surfaces
B)the surface area in contact
C)the reaction force
D)the normal force

Question 33

What happens to momentum when an impulse acts on a system?

A)momentum is conserved
B)momentum is changed
C)impulse does not affect momentum
D)all of these answers are correct

Question 34

The formula for mechanical work is the product of which of the following?

A)force and displacement
B)force and time
C)acceleration and time
D)power and displacement

Question 35

Choose the term that describes the constant-magnitude friction generated between two surfaces in contact during motion.

A)friction
B)coefficient of friction
C)maximum static friction
D)kinetic friction

Question 36

How does adding weight to the back of a pickup increase the friction between the tires and the icy road?

A)changes μ_k
B)changes μ_s
C)changes R
D)friction is not increased

Question 37

Which of the following is a correct unit of mechanical power?

A)joules
B)watts
C)kg-m
D)kg/m

Question 38

Which of the following is/are correct formula(s)for mechanical power?

A)P = W/t
B)P = Fd/t
C)P = Fv
D)Both P = W/t and P = Fd/t
E)All of these answers are correct

Question 39

Which of the following is/are true statement(s)regarding the law of gravitation?

A)All bodies are attracted to one another with a force proportional to the product of their masses.
B)All bodies are attracted to one another with a force inversely proportional to the square of the distance between them.
C)The law of gravitation ceases to exist outside the earth's atmosphere.
D)Both all bodies are attracted to one another with a force proportional to the product of their masses and all bodies are attracted to one another with a force inversely proportional to the square of the distance between them.
E)All of these answers are correct.

Question 40

Choose the term that describes the number that serves as an index of the interaction between two surfaces in contact.

A)coefficient of friction
B)maximum static friction
C)friction
D)kinetic friction

Question 41

A number that serves as an index of elasticity for colliding bodies is called coefficient of ________.

Question 42

Newton's law of ________ can be restated as the conservation of ________.

Question 43

Choose the term that describes the number that serves as an index of elasticity for colliding bodies.

A)coefficient of friction
B)coefficient of restitution
C)friction
D)impact

Question 44

Elite sprinters display greater impulse against the starting blocks than sub-elite sprinters.

Question 45

A motionless object sitting on a motionless surface,with no horizontal force application,has no friction.

Question 46

Choose the term that describes the rate of work production.

A)potential energy
B)power
C)strain energy
D)work

Question 47

An impact resulting in the total loss of velocity would be called a perfectly ________ impact.

Question 48

Two common forces that act to reduce momentum are ________ and ________ ________.

Question 49

New blade designs have resulted in extremely low values for the kinetic friction coefficients of ice hockey skates on ice.

Question 50

Newton's law of acceleration demonstrates the relationship between acceleration,________ and ________.

Question 51

Choose the term that describes the capacity to do work by virtue of a deformed body's return to its original shape.

A)potential energy
B)power
C)strain energy
D)kinetic energy

Question 52

Choose the term that describes an energy of motion.

A)kinetic energy
B)kinetic friction
C)potential energy
D)strain energy

Question 53

Choose the term that describes an impact during which the velocity of the system is conserved.

A)maximum static friction
B)impact
C)perfectly elastic impact
D)perfectly plastic impact

Question 54

Harder running surfaces result in greater ground reaction forces.