00: Introduction to Dynamics

Question 1

Definition of Dynamics

Answer 1

The branch of mechanics which deals with the study of bodies in motion.

Question 2

This is used to define motion of a particle or body without consideration of the forces causing the motion. It essentially deals with relation between displacement (S), velocity (V), and acceleration (a).

Answer 2

Kinematics

Question 3

This is used to relate the force acting on a body to
its mass and acceleration. When acceleration
of a body caused by the forces acting on it
has been determined, the principles of
kinematics may be now be applied to
determine the displacement or velocity at any
instant.

Answer 3

Kinetics

Question 4

Any object thrown into space upon which the only acting force is gravity. The primary force acting on a projectile is gravity. This doesn’t necessarily mean that other forces do not act on it, just that their effect is minimal compared to gravity.

Answer 4

A projectile

Question 5

The path followed by a projectile is known as a ____.

Answer 5

Trajectory

Question 6

This is defined as motion that occurs when a particle travels along a curved path. The curved path can be in two dimensions (in a plane), or in three dimensions. This type of motion is more complex than rectilinear (straight-line) motion.

Answer 6

Curvilinear Motion

Question 7

The rate at which work is done

Answer 7

Power

Question 8

Watts or Joules/sec. or N-m/s

Answer 8

P

Question 9

Using less energy to perform the same task,
eliminating energy waste

Answer 9

Efficiency

Question 10

It came from Newton’s 2nd Law

Answer 10

Impulse - Momentum

Question 11

It states that the acceleration of an object depends directly upon the net force acting upon the object and inversely upon
the mass of the object

Answer 11

Impulse - Momentum

Question 12

Principle of Force, Acceleration, and Mass in Impulse - Momentum

Answer 12

Force is directly proportional to Acceleration
Mass is indirectly proportional to Acceleration

The Value of Impulse = The Value of Momentum

Impact Time is Indirectly proportional to Impact Force

Question 13

Force experienced by our object once it hit
something

Answer 13

Impact Force

Question 14

Time that it is in contact both objects due to the
collision

Answer 14

Impact Time

Question 15

For a collision occurring between Object 1 and Object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by Object 1 is equal to the momentum gained by Object 2.

Answer 15

Law of Conservation of Momentum

Question 16

The ratio of the velocity after the impact to the velocity before the impact, between two object after their collision.

Answer 16

Coefficient of Restitution

Question 17

The force applied to an object causing displacement.

Answer 17

Work

Question 18

Work - Energy Principle

Answer 18

Positive Force > Acting on the same direction
Negative Force > Acting on the opposite direction
No Work > Acting on perpendicular direction