Chapter 6 ~ Momentum

Question 1

Definition of momentum and the formula :

Answer 1

° the product of mass and velocity of a body

P=mv

Question 2

The change in momentum formula =

Answer 2

🔼P= m🔼v
🔼P= m(v-u)

Question 3

Is momentum a vector or scalar quantity?

Answer 3

Vector

Question 4

Unit of momentum is

Answer 4

Kgms^-1

Question 5

State the law of conservation of momentum and the formula linked to it :

Answer 5

°for a closed system in any direction, the total momentum of objects before a collision 💥 equals the total momentum of objects after a collision

m1u1 +m2u2 = m1v1 + m2v2

1- referring to body one🚘
2- referring to body 2🚆

Question 6

2 ways to describe a collision 💥

Answer 6

1. Sticky

Or

2. Springy

Question 7

Springy refers to

Answer 7

Both object A and B separate and go in opposite directions after the collision 💥

Question 8

Sticky refers to…

Answer 8

Both object A and B move in the same direction (as one body) after the collision 💥

Question 9

What are the 3 types of collisions 💥?

Answer 9

1. Perfectly elastic collision 💥
2. Inelastic collision 💥
3. Explosive 💣 collision 💥

Question 10

2 characteristics of perfectly elastic collisions 💥

Answer 10

1. Kinetic energy is conserved (KE before collision 💥 = KE after collision 💥)
2. Relative speed of approach = relative speed of separation

Question 11

1 characteristic of inelastic collisions 💥 :

Answer 11

1. Kinetic energy is NOT conserved. It is transferred to other forms of energy e.g. Sound 🔊 or heat 🔥

Question 12

1 characteristic of explosive 💣 collisions 💥 (e.g. Nuclear ⚛ reaction)

Answer 12

1. gain in kinetic energy ⛮

Question 13

Newton’s first law and how it links with momentum

Answer 13

Newton’s first law states that: an object will remain at rest or keep traveling at constant velocity unless acted on by a resultant force.

Link to momentum :
Constant velocity means constant momentum

Question 14

Newton’s second law of motion :

Answer 14

The resultant force acting on an object is directly proportional to the rate of change of the linear momentum of that object.

(the resultant force and the change of momentum are in the same direction)

Question 15

Formula formed from Newton’s second law

Answer 15

F =🔼 p /🔼 t

Resultant force =

Change in momentum(kgms^-1) ÷ change in time ⌚ (s)

Question 16

Newton’s third law of motion

Answer 16

When two bodies interact, the forces they exert on each other are equal in magnitude and opposite in direction.

Question 17

2 equations for force

Answer 17

F= ma

F=🔼 p /🔼 t

Question 18

Resultant force = (2 things)

Answer 18

Rate of change in momentum

Or
the product of mass and acceleration of a body