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Inertia, Newton's 1st, 2nd and 3rd Law of Motion - Quiz for Practice | KIN 346, Quizzes of Biomechanics

University of Nevada - Las Vegas (UNLV)Biomechanics

Material Type: Quiz; Class: BIOMECHANICS; Subject: Kinesiology; University: University of Nevada - Las Vegas; Term: Unknown 1989;

Typology: Quizzes

2009/2010

Uploaded on 02/24/2010

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Quiz __ KIN 346
Biomechanics
Name: ________________ Date:
There is no partial credit for any answer. Each question is worth one point.
1. Define Newton’s First Law of Motion.
2. Define Newton’s Second Law of Motion.
3. Define Newton’s Third Law of Motion.
4. Define inertia.
5. If a 100 N force (F) was applied for 2 s (t) to a 20 kg (m) object initially moving at 2 m/s (vi), what
would be the object’s final velocity (vf)?
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Quiz __ KIN 346 Biomechanics Name: ________________ Date: There is no partial credit for any answer. Each question is worth one point.

  1. Define Newton’s First Law of Motion.
  2. Define Newton’s Second Law of Motion.
  3. Define Newton’s Third Law of Motion.
  4. Define inertia.
  5. If a 100 N force (F) was applied for 2 s (t) to a 20 kg (m) object initially moving at 2 m/s (vi), what would be the object’s final velocity (vf)?

Quiz __ KIN 346 Biomechanics Name: ________________ Date: There is no partial credit for any answer. Each question is worth one point.

  1. Which of the following terms represents an object’s resistance to change motion? a. Weight b. Force c. Inertia d. Acceleration
  2. If an object is dropped with zero initial velocity (vertical direction), how fast would it be going if it was in the air for 2 seconds (neglecting air resistance)?
  3. During riding on an elevator from the 1st^ to 5th^ floor, the floor force increased initially. Which of the following statements best explains this observation? a. The person’s mass increased initially. b. The elevator underwent negative acceleration. c. The velocity of the elevator increased while motion was in the positive direction. d. The velocity of the elevator decreased while motion was in the negative direction.
  4. Draw the moment arms (i.e., d) for each lever system. a. b. c.
  5. Consider a lever situation in which the following forces acting about the axis: F 1 = 10 N F 3 = 15 N F 2 = 8 N Given the moment arms (d 1 = 0.05 m; d 2 = 0.25 m; d 3 = 0.10 m), what would be the final angular velocity (f) if of the lever (I = 10 kgm^2 ) if the initial angular velocity was 0 rad/s (i) and the forces were applied for 0.5 s (t)? (counter-clockwise torque is positive)

Quiz 6 KIN 346 Biomechanics Name: ________________ Date: There is no partial credit for any answer. Each question is worth one point.

  1. What is the equation used to calculate impulse?
  2. What is the equation used to calculate momentum?
  3. How much impulse would be required to increase an object’s (mass = 50 kg) velocity from 2 m/s to 5 m/s?
  4. How long would a 150 N force need to be applied in order to cause a 75 kgm/s change in an object’s momentum?
  5. If a person pushed on a door with a force of 25 N, and the moment arm was 0.5 meter, what would be the torque? a. 25 Nm c. 100 Nm b. 50 Nm d. 12.5 Nm
  6. If an object achieved an angular acceleration of 20 rad/s^2 due to a torque of 40 Nm, what was the object’s moment of inertia? a. 0.5 kgm^2 d. 800 kgm^2 b. 2 kgm^2 e. 0.5 kgm/s c. 8 kgm^2
  7. If initial angular velocity is 0 deg/s (i), what would be the final angular velocity (f) if a 100 N T was applied for 1 s to an object with a moment of inertia of 2 km^2?
  8. Consider a situation when only two torques are acting about the elbow: torque due to the biceps and torque due to resistance (i.e., weight). During a bicep curl exercise, if the biceps generate 250 N of force with a moment arm of 0.05 m, what type of contraction would occur if the resistance force was 62 N (moment arm = 0.2 m)?