Mechanics

Question 1

Define: momentum

Answer 1

The product of the mass and velocity of the object.

Question 2

State: Newton’s Second Law of Motion in terms of momentum

Answer 2

The resultant/net force acting on an object is equal to the rate of change of momentum of the object in the direction of the resultant/net force.

Question 3

Define: impulse

Answer 3

The product of the resultant/net force acting on an object and the time the resultant/net force acts on the object.

Question 4

State: The Principle of Conservation of Linear Momentum

Answer 4

The total linear momentum of an isolated system remains constant.

Question 5

Define: normal force

Answer 5

the force or the component of a force which a surface exerts on an object with which it is in contact, and which is perpendicular to the surface.

Question 6

Define: A non-conservative force

Answer 6

a force for which the work done in moving an object between two points depends on the path taken. Examples are frictional force, air resistance, tension in a chord, etc.

Question 7

Define: Inelastic collision

Answer 7

Momentum remains the same. Kinetic energy does not remain the same.

Question 8

Define: Elastic collision

Answer 8

Momentum remains the same. Kinetic energy remains the same.

Question 9

State: The principle of conservation of mechanical energy

Answer 9

The total mechanical energy (sum of gravitational potential energy and kinetic energy) in an isolated system remains constant. (A system is isolated when the resultant/net external force acting on the system is zero).

Question 10

Define: Conservative force

Answer 10

a force for which the work done in moving an object between two points is independent of the path taken. Examples are gravitational force, the elastic force in a spring and electrostatic forces (coulomb forces).

Question 11

The relationship of Fnet and the change in momentum

Answer 11

Directly proportional

Question 12

Impulse SI unit

Answer 12

N.s

Question 13

Momentum SI unit

Answer 13

kg.m.s-1

Question 14

State: The equation of momentum

Answer 14

p=mv

Question 15

State: What 2 factors could change the objects momentum?

Answer 15

momentum can change if

1) the object speeds up or slows down
2) the object changes direction

Question 16

A _____ is required to increase, decrease, or change the direction of momentum

Answer 16

force

Question 17

State what happens when rebound impacts occur

Answer 17

Velocity and momentum are in the opposite direction if object is collided with another object the momentum then has the opposite sign

Question 18

State: Partially inelastic collision

Answer 18

Colliding objects move apart and have less kinetic energy after the collision than before.

Question 19

Define: Isolated system

Answer 19

An isolated system is a physical configuration of particles and or objects that we study
that doesn’t exchange any matter with its surroundings and is not subject to any force
whose source is external to the system.

Question 20

Define: System

Answer 20

A system is a physical configuration of particles and or objects that we study.