Physics, Friday Bell Ringer, 11.8.17

The law of conservation of momentum states that, 

• p before is less than p after

• p before is the same as p after

• p before is more than p after

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

If 2 objects collide and stick together, what will happen to their velocities?

• velocities will increase

• velocities will decrease

• velocities will stay the same

• none of the above

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

Momentum is a ____________________ quantity

• science

• scalar

• vector

• energy

Shaniqua noticed a collision outside the coffee shop where two cars collided and stuck together.  What type of collision did she observe?

• Elastic

• Inelastic

A 2.5 kg ball moving at 4.2 m/s collides with a 2.5 kg stationary ball. If the first ball is at rest after the collision, what is the velocity of the second ball? 

• 2.1 m/s

• 2.5 m/s

• 4.2 m/s

• 8.4 m/s

A 3,000 kg truck moving at +10 m/s hits a 1,000 kg parked car which moves off at +15 m/s. What is the velocity of the truck?

• 10 m/s

• 0 m/s

• 5 m/s

• 2 m/s

If you double the velocity of an object, then its momentum will ______________.

• will double 

• will half

• will quadruple (x4)

• will be quartered (x 1/4)

A 2kg box is moving at 2m/s when it get pushed with 10N of force over a period of 3 seconds. What will be its velocity after the push?

• 13m/s

• 17m/s

• 58m/s

• 62m/s