Law of Conservation of Momentum

Law of Conservation of Linear Momentum and Impulse

Multiple Choice

The Law of Conservation of Momentum states:

• The total momentum before a collision is equal to the total momentum after a collision.

• The total momentum before a collision is greater than the total momentum after a collision.

• The total momentum before a collision is less than the total momentum after a collision.

• The total momentum before a collision is not related to the total momentum after a collision.

Multiple Choice

If two objects collide or explode, they experience

• the same force for the same amount of time.

• different forces for the same amount of time.

• different forces for different amounts of time.

• the same force for different amounts of time.

Q2:

What is COLLISION?

COLLISION

Collision is also called as impact.

In physics, a forceful coming together in direct contact of two bodies.

TYPES OF COLLISION

Elastic Collision

Perfectly Inelastic Collision

Inelastic Collision

Multiple Choice

When two bodies of the same masses join together during collision and move together as one after the collision.

Example : Clay

• Elastic Collision

• Collision

• Inelastic Collision

• Perfectly inelastic Collision

Multiple Choice

A collision in which both momentum and Kinetic energy are conserved.

Example : Sphere with the same mass

• Elastic Collision

• Collision

• Inelastic Collision

• Perfectly Inelastic Collision

Multiple Choice

It is the interaction that occurs when the two or more object hits each other.

• Elastic Collision

• Collision

• Inelastic Collision

• Perfectly inelastic Collision

Multiple Choice

In this type of collision, objects tend to "stick" together.

• elastic

• inelastic

• They "stick" together in both types of collisions

Equation:

 $m_1v_1+m_2v_2=m_1v_1’+m_2v_2’$  

Multiple Choice

The total momentum of two objects before collision is 450 kg.m/s. What will be their total momentum after collision?

• 0 kg.m/s

• 350 kg.m/s

• 175 kg.m/s

• 450 kg.m/s

Multiple Choice

Which of the 0.5kg spheres in the image experiences the greater impulse?

• Black

• White

• Same

• Not Enough Info

Multiple Choice

An 1 kg object moving to the right at 2 m/s collides inelastically with a 1 kg object moving to the left at 2 m/s. The final velocity of both objects will be

• 0 m/s

• 1 m/s

• 2 m/s

• 4 m/s

Multiple Choice

A 0.250 kg cart moving at 0.400 m/s has how much momentum?

• 0.1 kg-m/s

• 1 kg-m/s

• 10 kg-m/s

• 100 kg-m/s

Multiple Choice

A 10kg toy truck moves at 5m/s East. It collides head-on with a 5kg toy car moving 10 m/s moving west. What is the total momentum of the system?

• 0 kgm/s

• 30 kgm/s

• 50 kgm/s

• 10 kgm/s

Multiple Choice

A 125-kg car moving at 12 m/s hits a 200-kg car moving at -13 m/s. If the first car bounces back at -12.5 m/s, what is the velocity of the second car after the collision?

• 1.2 m/s

• 2.3 m/s

• 3.2 m/s

• 4.1 m/s

Multiple Choice

Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:

• 2 m/s

• 3.4 m/s

• 4.6 m/s

• 7.1 m/s