Newtons Laws & Momentum (impulse)

Question 1

Normal force (N)

Answer 1

Force which a surface exerts on an object which is perpendicular to its surface

Question 2

Frictional force (f)

Answer 2

Force which opposes motion of an object acting parallel to its surface

Question 3

Static force fs

Answer 3

Force opposing tendency of motion of a stationary object relative to surface

Question 4

Kinetic force fk

Answer 4

Force opposing motion of moving object relative to a surface

Question 5

Weight

Answer 5

Gravitational force the earth exerts on any object

Question 6

Newtons 1st law

Answer 6

A body will remain in its state of rest or constant velocity unless acted upon by a non zero net force

Question 7

Newtons 2nd law

Answer 7

When a net force acts on an object, the object will accelerate in the direction of the force. Acceleration is directly proportional to force & inversely proportional to mass of object

Question 8

Newtons 3rd law

Answer 8

When a body exerts a force on a second body, the 2nd body will exert of equal magnitude in opposite direction of body 1

Question 9

Universal Law of gravitation

Answer 9

Each body in the universe attracts every other particle with a gravitational force that is directly proportional to the product of their masses but inversely proportional to distance squared.

Question 10

Momentum

Answer 10

Product of an objects mass & velocity

Question 11

Newtons 2nd law of Motion in terms of momentum

Answer 11

Net force acting in object is equal to rate of change of momentum of object in direction of net force

Question 12

Impulse

Answer 12

Product of net force acting on an object & time net force acts on the object

Question 13

Closed/isolated system

Answer 13

A system which the net external force is zero

Question 14

Principle of conservation of linear momentum

Answer 14

Total linear momentum of a closed system remains constant

Question 15

Projectile

Answer 15

Object upon which the only force acting is gravitational force

Question 16

Collision

Answer 16

Isolated event where 2 or more bodies exert forces on each other over short time

Question 17

System

Answer 17

A collection of 2 or more objects that interact with each other

Question 18

Internal forces

Answer 18

Forces that resule from a source within a system

Question 19

Elastic collision

Answer 19

Kinetic energy which is conserved/does not change during a collision.
Sum of kinetic energy before collision is exactly equal to kinetic energy after collision

Question 20

Inelastic collision

Answer 20

Kinetic energy which is not conserved after Collison.
Could be lost to sound, give off light, heat up etc.