Collisions, Explosions & Impulse

Question 1

The momentum of an object is given by

Answer 1

P=mv

Question 2

Momentum is a what?

Answer 2

vector

Question 3

The law of conservation of momentum is:​

Answer 3

The total momentum of a system does not change in a collision or explosion in the absence of external forces.​

Question 4

Inelastic collisions​

Answer 4

Total momentum is conserved​
Kinetic energy decreases as could be converted into heat or sound

Question 5

Elastic Collisions​

Answer 5

Total momentum is conserved​
Total kinetic energy is conserved

Question 6

Law of conservation of momentum:​

Answer 6

total momentum before = total momentum after
m1u1+m2u2=(m1+m2)V

Question 7

If Ek is conserved

Answer 7

elastic collision i.e. collide and move apart in opposite direction

Question 8

formula for explosion?

Answer 8

(m1+m2)u=m1v1+m2v2

Question 9

In an explosion, the total momentum of the system is

Answer 9

always conserved.

Question 10

Before the explosion, both objects are at rest, so?

Answer 10

the total momentum of the system is zero.

Question 11

What is impulse?

Answer 11

change in momentum

Question 12

The impulse does not depend on __ but __ does?

Answer 12

The impulse does not depend on the time taken for the collision, but the force does.

Question 13

Area under force time graph is equal to what?

Answer 13

impulse

Question 14

Impulse=

Answer 14

mv-mu

Question 15

If the time of impact of a collision is decreases, the average force will___
the impulse will?

Answer 15

increase
unchanged (area under the graph will be the same)

Question 16

increasing time of collision?

Answer 16

reduces average force