Momentum and Impulse

Question 1

momentum

Answer 1

product of mass and velocity

Question 2

what is momentum measured in?

Answer 2

kgm/s

Question 3

is momentum scalar or vector?

Answer 3

vector

Question 4

law of conservation of linear momentum

Answer 4

in absence of external forces, the total momentum just before a collision/explosion is equal to the total momentum just after the collision/explosion

Question 5

what does the law of conservation of linear momentum apply to?

Answer 5

collisions between two objects in straight line

Question 6

What are the two types of collisions?

Answer 6

elastic and inelastic

Question 7

What happens in an elastic collisions to the objects?

Answer 7

objects bounce apart after collision

Question 8

What happens to the momentum in elastic collisions?

Answer 8

conserved

Question 9

What happens to the kinetic energy in elastic collisions?

Answer 9

conserved

Question 10

What happens to the objects in inelastic collisions?

Answer 10

stick together

Question 11

What happens to momentum in inelastic collisions?

Answer 11

conserved

Question 12

What happens to kinetic energy in inelastic collisions?

Answer 12

decreases - changed into sound, heat, energy of deformation

Question 13

How many objects are there in explosions?

Answer 13

one only

Question 14

What happens to the objects in explosions?

Answer 14

split into two parts and travel in opposite directions in straight line

Question 15

What happens to momentum in explosions?

Answer 15

conserved

Question 16

What happens to kinetic energy in explosions?

Answer 16

increases at start object has no kinetic energy but changed potential energy into kinetic energy

Question 17

impulse

Answer 17

what a force gives to an object when it acts on it

Question 18

impulse equation

Answer 18

impulse = Ft impulse = change in momentum

Question 19

describe a ball striking a wall.

Answer 19

force wall exerts on ball is 0 before impact rises to maximum as ball strikes wall and is deformed decreases to 0 as ball rebounds, regaining shape

Question 20

graph to show ball striking a wall

Answer 20

Question 21

what changes if the ball is hard? (time of contact and maximum force)

Answer 21

time of contact small maximum force large

Question 22

what changes if the ball is soft? (time of contact and maximum force)

Answer 22

time of contact longer maximum force smaller