Lecture 10

Question 1

What is translation force

Answer 1

Applied through the middle of the object to move the object along some distance

Question 2

What is rotation force

Answer 2

Applied through the edge of the object to move the object some distance

Question 3

What is torque

Answer 3

The turning effect produced by force (moment of force)

Tendency of a force to cause rotation about a specific axis

Question 4

What is the equation for torque

What are the Units

Answer 4

Torque = Force x Lever arm

Units: Nm

Question 5

What is the lever arm

When is this seen on a diagram

Answer 5

Shortest distance between force line of action and the point about which rotation will happen

Shortest distance between one point and a line (perpendicular)

Question 6

What quantity is torque

Answer 6

Vector

Question 7

What is the decription of torque

Answer 7

Magnitude

Axis of location (turning effect)

Direction (Clockwise/counterclockwise)

Question 8

Class 1 lever systems involve

Example

Answer 8

Effort
Fulcrum
Load

Head/neck

Question 9

Class 2 lever systems involve

Example

Answer 9

Fulcrum
Load
Effort

Plank or tip toe

Question 10

Class 3 lever systems involve

Answer 10

Fulcrum
Effort
Load

Bicep

Question 11

What do bones, joints and muscles all represent in a human bony lever

Answer 11

Bones = rigid frame of the lever

Joints = provide movement rotation axis

Muscles = generate force