05d. Biomechanics - Newtons laws

Question 1

List Newton’s 1st law of motion

Answer 1

An object will remain at rest or continue in a state of constant motion unless acted upon by external force to change its state of motion.

Question 2

List Newton’s 2nd law of motion

Answer 2

The rate of acceleration of a body is directly proportional to the force applied to it and in the direction in which the force is applied.

Question 3

List Newton’s 3rd law of motion

Answer 3

For every action there is an equal and opposite reaction

Question 4

List Newton’s 1st law of angular motion

Answer 4

The angular motion of a body remains constant unless acted upon by an external torque.

Question 5

List Newton’s 2nd law of angular motion

Answer 5

A torque applied to an object will produce a change in angular motion in the direction of the applied torque that is directly proportional to the size of the torque and inversely proportional to the objects moment of inertia.

Question 6

List Newton’s 3rd law of angular motion

Answer 6

For every torque there is an equal and opposite torque.

Question 7

Describe a 2nd Class lever using an example from the human body

Answer 7

Resistance in middle, axis and force at either end. Eg when doing a push up or calf raise.

Question 8

Describe a 3rd Class lever using an example from the human body

Answer 8

Force/Effort in middle. Axis and resistance at either end. Most common in human body eg bicep curl.

Question 9

Identify the mechanical advantage of a 2nd class lever

Answer 9

Allow you to produce more force with less effort (greater than 1)

Question 10

Identify the mechanical advantage of a 3rd class lever

Answer 10

They can increase the range of motion and angular speed at the end of the lever (less than 1)

Question 11

Describe the force arm in a lever

Answer 11

the distance from the axis to the force

Question 12

Describe the resistance arm in a lever

Answer 12

distance from the axis to the resistance

Question 13

Which of newtons laws state that an object will remain at rest or continue in a state of constant motion unless acted upon by external force to change its state of motion.

Answer 13

Newtons first law

Question 14

Which of newtons laws states the rate of acceleration of a body is directly proportional to the force applied to it and in the direction in which the force is applied.

Answer 14

Newton’s 2nd law

Question 15

Which of newtons laws states for every action there is an equal and opposite reaction

Answer 15

Newtons 3rd law

Question 16

Which of newtons laws states the angular motion of a body remains constant unless acted upon by an external torque.

Answer 16

Newtons first law of angular motion

Question 17

Which of newtons laws states a torque applied to an object will produce a change in angular motion in the direction of the applied torque that is directly proportional to the size of the torque and inversely proportional to the objects moment of inertia.

Answer 17

Newtons second law of angular motion

Question 18

Which of newtons laws states for every torque there is an equal and opposite torque.

Answer 18

Newtons third law of angular motion

Question 19

What is the difference between force and torque?

Answer 19

Torque is force around an axis (rotational force)

Question 20

What is the distance from the axis to the force called?

Answer 20

Force arm

Question 21

What is the distance from the axis to the resistance called?

Answer 21

Resistance arm

Question 22

In a third class lever will the force or resistance arm be greater?

Answer 22

Resistance