Unit 1: Elementary Mechanics and Dynamics

Question 1

Force

Answer 1

may be defined as any action on a body that changes its size, shape, or state of rest/motion

Question 2

Velocity

Answer 2

is the rate of change in position/displacement that occurs in a given time.

Question 3

Force SI unit?

Answer 3

Newton

Question 4

Scalar Quantity

Answer 4

Only contain magnitude. Examples of scalar quantities include time , volume , speed, mass , temperature , distance, entropy, energy , work ,

Question 5

Vector Quantity

Answer 5

a quantity that has both magnitude and direction. Examples of vector quantities include displacement, velocity, position, force, and torque.

Question 6

What is Work?

Answer 6

When force is applied to a body and it causes it to move a distance then work is done.

Question 7

Work Formula

Answer 7

Work Done = Force in Newtons * Distance in meters

Question 8

What is work measured in?

Answer 8

In joules

Question 9

Power

Answer 9

Is the rate at which work is done in a given time.

Question 10

Acceleration of Gravity

Answer 10

9.81 m/s^2

Question 11

Space Diagrams

Answer 11

Illustrates a systems of vectors

Question 12

Coplanar Vectors

Answer 12

If all vectors are in the same plane or quadrant they are coplanar

Question 13

Concurrent Vectors

Answer 13

Simply vectors one after another

Question 14

Resultant

Answer 14

A single vector that can represent a number of vectors displacement

Question 15

Displacement Formula

Answer 15

D = Average Velocity * Time

Question 16

Average Velocity

Answer 16

Avg V = Intial veloc

Question 17

Static Frition

Answer 17

The resistance or friction to overcome required to start a body in motion

Question 18

Kinetic Friction

Answer 18

The friction that must be overcome to keep a body in motion

Question 19

Belt Drives

Answer 19

Moves mechanical energy between pulleys. If there is no slippage between the belt and pulleys the linear speed of any point on each pulley will be the same and equal to the linear speed of the belt.
If the driver is smaller the follower will rotate slower. The opposite is also true. A bigger driver will move a smaller follower faster

The tension of the bottom belt is always greater than the tension in the top belt.

Question 20

Intermediate Gears

Answer 20

Do not affect speed of driven gears, they just transmit power

Question 21

Tensile Stress

Answer 21

A bar or uniform cross-section is subjected to a pair of forces acting in different directions. Such as a pipe being stretched.

Question 22

Compressive Stress

Answer 22

Forces being applied towards, or inwards on to a bar or plate.

Question 23

Shear Stress

Answer 23

The stress experienced by a bolt or rivet holding two pieces of metal together. as the two metal pieces move or experience pull the bolt may break or sheer apart.