p7

Question 1

momentum

Answer 1

inertia in motion

Question 2

impulse

Answer 2

change in momentum

Question 3

conservation of momentum

Answer 3

in the absence of an external force, the momentum of a system remains the same

Question 4

elastic collision

Answer 4

collision without objects being peramnently deforemed and without generating heat

Question 5

inelastic collision

Answer 5

collision where objects become tangled or attached or permanently deformed

Question 6

What is the formula for momentum? -

Answer 6

mass x speed

Question 7

What is the difference between momentum and inertia? -

Answer 7

inertia is an object’s tendency to stay in motion or at rest until another force acts upon it; momentum is an object’s inertia in motion

Question 8

What is the momentum of a 80 kg object moving 30 m/s? -

Answer 8

2400 kg m/s

Question 9

Why does bungee jumping with a bungee cord hurt less than bungee jumping with a chain? (the word ‘time’ should be included in your answer)

Answer 9

The bungee cord increases the time that you are falling, which increases your impulse and decreases your momentum

Question 10

If a car (1,000kg and 20 m/s) collides with a truck (2,000kg and 0m/s) and gets stuck together, what is their velocity after the crash?

Answer 10

(1,000 x 20 = 20,000 - momentum of car) and (2,000 x 0 = 0 - momentum of truck) so (20,000 + 0 = 20,000 - momentums added together). (1,000 + 2,000 = 3,000 - total mass of truck and car). (20,000 / 3,000 = 6.67 - divide momentum by mass). Their velocity is 6,67 m/s going left?? In the direction that the car is traveling.