KINS 382 LAB 16

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KINS 382 LAB 16

• Review Unit 3

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Question 1

• Define Newtons Laws of Motion
• a. Law of Inertia Bodys in motion tend to stay
  in motion and in a straight line unless acted on
  by an external force.
• b. Law of Acceleration a F/m. An increase of
  force increases acceleration and an increase in
  mass decreases acceleration.
• c. Law of Reaction Every action has an equal
  and opposite reaction.

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Question 2

• Every particle in the universe is attracted to
  every other particle. How can you quantify this
  concept? Define the law.
• F Gm1m2 / d²
• The Law of Mass Attraction All bodies are
  attracted to one another with a force
  proportional to the product of their masses and
  inversely proportional to the distance between
  them.

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Question 3

• Write the formula and the unit used for the
  following
• Force F ma
  Newton
• Work W F x d
  Joules
• Power P W/t
  Watts
• Kinetic Energy KE 1/2mV² Joules
• Potential Energy PE wt(ht) Joules

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Question 4

• __________ never changes, but depending on the
  planets gravitational field ________ can change.
• Mass
• Weight or Force

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Question 5

• T or F Weight is a force.
• True

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Question 6

• __________ is a resistance to change in a motion
  state.
• Inertia

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Question 7

• The measure of inertia is ________.
• Mass

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Question 8

• T or F External forces can overcome inertia.
• True

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Question 9

• When describing measures of forces, the ________
  is the preferred unit of measurement.
• Newton

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Question 10

• When no set external forces or torques are
  applied to an object, that object is in a state
  of
• a. acceleration
• b. equilibrium
• c. terminal velocity
• d. a and b

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Question 11

• A skater will continue to spin unless an external
  force is applied. Which law best describes this
  phenomenon?
• a. Newton I
• b. Newton II
• c. Newton III
• d. Force attraction

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Question 12

• When a skydiver jumps from the plane, the work
  done on the skydiver is best described as
• a. positive work by gravity, negative work by the
  drag.
• b. gravity applies a force opposite the
  displacement.
• c. negative work by gravity, positive work by the
  drag force.
• d. a and b

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Question 13

• A shot-putter applies 250lb of force to a shot.
  The distance the force is applied is 2.5ft.
• What is the work performed on the shot?

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Answer 13

• W F x d
• F 250lb or 1112.5N, d 2.5ft or .76m
• W 1112.5N(.76m) 845.5 Joules or Nm

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Question 14

• If the work done in problem 13 occurs in 0.2s,
  what is the power?
• P Work/time
• P 845.5Joules / 0.2s
• P 4227.5 Watts

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Question 15

• When a weight lifter holds a barbell overhead,
  which best describes what is happening?
• a. mechanical work is occurring because energy is
  being expended
• b. since no displacement, occurs there is no work
  being done
• c. energy is being expended
• d. no energy is being expended
• e. b and c

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Question 16

• T or F Positive work occurs when the direction
  of displacement is in the same direction as the
  force.
• True

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Question 17

• Two athletes perform a 250lb barbell chest press.
• Which best describes their performance?
• a. each athlete does the same amount of work
• b. the athlete that performed the press in the
  slowest time frame had the most power
• c. the athlete with the most power performed the
  mechanical work in the least amount of time
• d. a and c

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Question 18

• T or F In relation to work (F x d), if mass and
  velocity are held constant, force increases as
  distance increases.
• True

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Question 19

• The components of force are ________ and
  ________.
• Mass
• Acceleration

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Question 20

• T or F Newtons First Law expresses the
  interrelationships between mass, force, and
  acceleration.
• False (Newton II would be True)

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Question 21

• Newtons Law of gravitation indicates that
• a. the greater the mass of either body, the
  greater the attractive force
• b. the greater the distance between the bodies
  the greater the attractive force between them
• c. the greater the distance between the bodies
  the smaller the attractive force between them
• d. both a and c

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Question 22

• In explosive track and field events, which
  statement is most accurate
• a. a combination of force and velocity is
  critical
• b. the ability to produce mechanical power is
  critical
• c. mass is the critical component
• d. a and b

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Question 23

• T or F If a body is motionless its velocity is
  equal to zero, therefore its kinetic energy is
  also zero.
• True

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Question 24

• As a ball gains height, the following statements
  apply to the ball
• a. the ball is losing velocity with increasing
  height
• b. because of gravitational acceleration the ball
  loses kinetic energy
• c. at the apex of the balls trajectory, the
  balls velocity and kinetic energy are maximum
• d. as the ball gains height it gains potential
  energy
• e. a, b and d

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Matching

• 1. 2 (kg)m/s²
• 2. F x d
• 3. (kg)m²/s²
• 4. Nm
• 5. J/s
• 6. Unit of power
• 7. Work/time
• 8. 1 hp
• 9. KE
• 10. PE
• 11. Constant Force

• a. Joule
• b. Work
• c. Power
• d. Watt
• e. 2 Newtons
• f. 746 Watts
• g. Energy of position
• h. gravity
• i. Energy of motion

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Conclusion

• Good luck on your test!