Momentum

Question 1

Define momentum

Answer 1

The pruduct of an object’s mass and its velocity

Question 2

Linear momentum

Answer 2

Vector quantity with the same direction as the velocity of an object

Question 3

State Newton’s second law in terms of momentum

Answer 3

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

Question 4

What is a SYSTEM?

Answer 4

A system is a collection of two or more objects that interact with each other

Question 5

What are INTERNAL FORCES in a asystem?

Answer 5

They are the forces exchanged by the objects of a system

Question 6

What are EXTERNAL FORCES of a system?

Answer 6

They are forces originated from a source other than the objects within the system and which are not balanced by other forces

Question 7

What is an ISOLATED SYSTEM?

Answer 7

It is a system on which the external net force is zero

Question 8

State the principle of CONSERVATION OF LINEAR MOMENTUM

Answer 8

-the total linear momentum of an isolated system remains constant (is concerved)

Question 9

In a isolated system the sum of the initial momentum is equal to

Answer 9

The sum of the final momentum

Question 10

Define INELASTIC COLLISIONS

Answer 10

Collisions where kinetic energy is not conserverd

Question 11

Define ELASTIC COLLISIONS

Answer 11

Collisions where kinetic energy is conserverd

Question 12

Name the type of collision where kinetic energy is not conserverd

Answer 12

Inelastic collision

Question 13

Name the type of collisions where kinetic energy is conserverd

Answer 13

Elastic collision

Question 14

Newton’s craddle is an example of what type of collision?

Answer 14

Elastic collision

Question 15

Define IMPULSE

Answer 15

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

Question 16

Explain how you can prevent getting hurt while catching an object

Answer 16

• instead of suddenly stopping the object, you must stop it slowly
• because by extending the length of the impact
• you decrease the force of the impact
• which is makes catching the object less sore

Question 17

Explain how airbags can decrease the chance of fatality during an impact

Answer 17

• airbags increase the time taken for passenger to come to a rest
• therefore the net force acting on the passenger will decrease

Question 18

Explain how arrestor beds can prevent truck casualties

Answer 18

• when the breaking system of a truck overheats or fails, they can drive into arrestor beds
• as they decrease the truck’s momentum to 0
• over a long period of time
• therefore the force exerted on the truck is small enough to not hurt driver or damage the truck