There Is No Partial Credit for Any Answer. Each Question Is Worth One Point

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 (Dt) 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.

5. Consider a lever situation in which the following forces acting about the axis:

F1 = 10 N

F3 = 15 N F2 = 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 (wf) if of the lever (I = 10 kgm2) if the initial angular velocity was 0 rad/s (wi) and the forces were applied for 0.5 s (Dt)? (counter-clockwise torque is positive)

Quiz 5 KIN 346 Biomechanics

Name: ______Date:

There is no partial credit for any answer. Each question is worth one point.

1. ______is the measure of the tendency of a ______to cause rotation.

a. Force, acceleration

b. Force, momentum

c. Torque, force

d. Torque, angular acceleration

6. An object will continue to move in the same direction and with the same velocity until a force causes a change in motion is which law of motion?

a. Newton's first law of motion

b. Newton's second law of motion

c. The Law of Force

d. The Law of Action-Reaction

7. Draw the moment arms (i.e., d^) for each lever system.

8. Which term represents an objects resistance to change angular motion?

a. inertia

b. mass

c. moment of inertia

d. weight

9. What is the equation used to calculate impulse?

10. What is the equation used to calculate momentum?

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?

11. 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

12. If an object achieved an angular acceleration of 20 rad/s2 due to a torque of 40 Nm, what was the object’s moment of inertia?

a. 0.5 kgm2 d. 800 kgm2

b. 2 kgm2 e. 0.5 kgm/s

c. 8 kgm2

13. If initial angular velocity is 0 deg/s (wi), what would be the final angular velocity (wf) if a 100 N T was applied for 1 s to an object with a moment of inertia of 2 km2?

14. 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)?