Ch 7 Impulse And Momentum

Question 0

What type of quantity is linear momentum and in which direction does it point

Answer 0

Vector quantity

Points in the same direction as the velocity

Question 1

What type of quantity is impulse and then which direction does it point

Answer 1

Vector quantity

Has the same direction as the average force

Question 2

What is used to reveal a relationship between impulse and momentum

Answer 2

Newton’s second law

Question 3

What is the impulse momentum theorem

Answer 3

States that when a net force acts on an object, the impulse of this force is equal to the change in momentum of the object

Question 4

Essentially what is impulse equal to

Answer 4

Change in momentum

Question 5

Forces that the objects within the system exert on each other

Answer 5

Internal forces

Question 6

Forces exerted on the objects by agents external to the system

Answer 6

External forces

Question 7

The system where the sum of the external forces is zero

Answer 7

Isolated system

Question 8

What is the principle of conservation of linear momentum

Answer 8

States that the total linear momentum of an isolated system remains constant ( is conserved )

Question 9

What is the first step in applying momentum conservation

Answer 9

Make sure that the net external force is zero

Question 10

Can the total linear momentum be conserved even when the kinetic energies of the individual parts of the system change

Answer 10

YES

Question 11

What is an elastic collision

Answer 11

Collision in which the total kinetic energy of the system after the collision is equal to the total kinetic energy before the collision

Question 12

What is an inelastic collision

Answer 12

Collision in which the total kinetic energy of the system is not the same before and after the collision

Question 13

What is a completely inelastic collision

Answer 13

When the object stick together after colliding and they have the same final velocity

Question 14

What is the center of mass

Answer 14

The point at which the mass of the entire object or system can be considered to be located

Question 15

Where’s the center of mass located

Answer 15

Closer to area of greater mass density does not have to be located within the physical object

Question 16

How does the center of mass illustrate the law of conservation of momentum

Answer 16

If no external impulses act to change the motion of the center of mass of the system it continues its original motion

Question 17

Does the center of mass change

Answer 17

It does not change what it’s doing before the collision after the collision

Continuous velocity and direction if not it rest