Unit 3: Momentum & Energy

The momentum of an object is the sum of its mass and its velocity.

• True

• False

When two objects collide, their momentum after the collision is explained by ______.

• Newton’s first law of motion

• Newton’s second law of motion

• Newton’s third law of motion

• the conservation of momentum

A real car moving at 10 km/h has more momentum than a toy car moving at the same rate because ______.

• its mass is greater

• its mass is less

• it moves faster

• of friction

What do objects increasing in velocity NOT have?

• Momentum

• Mass

• Balanced forces

If an object with a mass of 12 kilograms is moving at 10 meters per second, what is its momentum?

• 120 kg*m/s

• 120 kg*m*s

• 1.2 kg*m/s

• 1.2 kg*m*s

Newton's Second Law of Motion can be summarized by which equation?

• M = F/a

• F = ma

• F = m/a

Which scenario would most likely occur when a cue ball strikes a pool ball that is at rest?

• The cue ball will stop making and also be at rest.

• The pool ball will accelerate in the same direction as the cue ball was initially moving.

• The cue ball will bounce back from the pool ball around the same velocity.

• The pool ball will accelerate to a velocity greater then the cue ball moving.

Determine the momentum of a 0.145 kg baseball thrown at 44.7 m/s.

• 6.4815 kg*m/s

• 3.0827 kg*m/s

• 30.2 kg*m*s

• 64.82 kg*m*s

A mass has a momentum of 50 kg*m/s, when its velocity doubles what happens to its momentum?

• The momentum doubles.

• The momentum quadruples.

• The momentum is halved.

• The momentum stays the same.

A projectile of mass 1 kilogram traveling at 9 meters per second collides with another projectile of mass 2 kilograms traveling at 6 meters per second in the same direction. If the projectiles "stick" together after their collision, what is their velocity after colliding?

• 7 m/s

• 8 m/s

• 7.5 m/s

• 9 m/s