8th Grade 6.4 & 6.5

Multiple Choice

Which of the following, moving at thesame speed, would be hardest to stop?

• car

• fire engine

• frisbee

• stroller

Multiple Choice

Which moving object, in all likelihood,will have the greatest momentum?

• volleyball hit by a fourth-grader

• volleyball hit by an Olympic volleyballplayer

• volleyball hit by a senior adult

• volleyball hit by a basketball coach

Multiple Choice

Which formula is used to calculatemomentum?

• Momentum = Mass × Speed

• Momentum = Weight × Speed

• Momentum = Volume × Velocity

• Momentum = Mass × Velocity

Multiple Choice

In which situation does the law ofconservation of momentum apply?

• in the absence of greatest velocity

• in the presence of least velocity

• in the absence of outside forces

• in the presence of outside forces

Multiple Choice

The total momentum of any group of objects remains the sameunless outside forces act on the objects

• true

• false

Multiple Choice

If outside forces such as friction are negligible, when twoobjects of the same mass collide and do not stick together, the objects multiplyvelocities.

• true

• false

Multiple Choice

Newton’s “quantity of motion” is conservation.

• true

• false

Multiple Choice

The less momentum an object has, the easier it is to stop.

• true

• false

Multiple Choice

Momentum, like velocity, is described by both a direction and a force.

• true

• false

Multiple Choice

 The momentum of a 1000-kg vehicle traveling at a velocity of25 m/s is 40kg × m/s.

• true

• false

Multiple Choice

The state that exists when the onlyforce acting on an object is gravity iscalled

• free fall

• inertia

• acceleration

• momentum

Multiple Choice

The acceleration due to gravity nearthe surface of Earth is equal to

• 9.8 m/s

• 9.8 kg*m/s

• 9.8 N

• 8.8 m/s²

Multiple Choice

Satellites in orbit around Earth travelin an almost circular path because Earth is

• centripetal

• free fall

• curved

• massive

Multiple Choice

The word centripetal means

• center seeking

• gravitational

• continuous

• free falling

Multiple Choice

The force that causes an object to move in a circle is called_____ force.

• centripetal

• gravitational

• balanced

Multiple Choice

Any object that travels around another object in space is a(n)

• satellite

• orbit

• centrifuge

Multiple Choice

An object traveling in a circle is accelerating because it is constantly changing

• direction

• inertia

• gravityu

Multiple Choice

____is the centripetal force that causes a satellite to move in a circle

• gravity

• acceleration

• friction

Multiple Choice

Satellites in orbit around Earth continually fall toward

• Earth

• the sun

• the moon

Multiple Choice

If you could turn off a centripetal force, ____ would cause the object to fly off in a straight line.

• inertia

• velocity

• acceleration