Unit 4 Test Review

How do airbags reduce your chance of getting hurt during an accident?

• Airbags increase momentum before collision

• Airbags reduce momentum during a collision

• Airbags increase the time it takes a person to stop moving

• Airbags cause friction which reduced the chance of getting hurt

When comparing the momentum of two moving objects, which of the following is correct?

• The object with the higher velocity will have less momentum if the masses are equal.

• The more massive object will have less momentum if its velocity is greater.

• The less massive object will have less momentum if the velocities are the same.

• The more massive object will have less momentum if the velocities are the same.

The impulse experienced by a body is equivalent to the body’s change in  

• velocity

• position

• force

• momentum

Two objects stick together and move with a common velocity after colliding. Identify the type of interaction.  

• elastic

• inelastic

• explosive

• implosive

Two objects move separately after colliding, and the total momentum remains constant. Identify the type of interaction.

• elastic

• inelastic

• explosive

• implosive

A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.

• The child has a greater momentum than the bike.

• The bike has a greater momentum than the child.

• Neither the child nor the bike has momentum.

• Both the child and the bike have the same momentum.

A soccer ball collides with another soccer ball at rest. The total momentum of the soccer balls

• remains constant

• is zero

• increases

• decreases

What velocity must a 1000 kg car have in order to have the same momentum as a 2000 kg truck traveling at a velocity of 15 m/s to the west?

• 30 m/s East

• 30 m/s West

• 60 m/s West

• 60 m/s East

A 0.15-kilogram baseball and a 7.25-kilogram bowling ball are both rolling along at 3 m/sec. Which object is easier to stop and why?

• The bowling ball because it has less inertia

• The baseball because it has more inertia

• The bowling ball because it has more inertia

• The baseball because it has less inertia

Compare the inertia and momentum of a 0.15 kilogram baseball moving at 50 m/sec with the inertia and momentum of a 7.25 kilogram bowling ball moving at 1 m/sec.

• The bowling ball has both more inertia and more momentum.

• The baseball has more inertia, but the bowling ball has more momentum.

• The baseball has both more inertia and more momentum.

• The bowling ball has both more inertia but the baseball has more momentum.