# ADV 8th Benchmark Review 1-d: Question Preview (ID: 11225)

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When a rocket is launched, the downward motion of the exhaust gases produces a reaction force in which direction?
a) downward
b) upward
c) sideways
d) circular around the nozzle

The combination of all forces acting on an object is called the
a) balanced force.
b) unbalanced force.
c) net force.
d) overall force.

As a car stops suddenly, your body continues to move forward. This is an example of
a) friction.
b) Newton's first law.
c) Newton's second law.
d) Newton's third law.

When the net force on an object equals zero, the forces are
a) balanced.
b) unbalanced.
c) acting in the same direction.
d) acting perpendicular to each other.

Newton's second law states that net force divided by mass equals
a) velocity.
b) gravity.
c) inertia.
d) acceleration.

Which of Newton's laws describes why roller skaters accelerate in opposite directions when they push off of each other.
a) first law of motion
b) second law of motion
c) third law of motion
d) law of universal gravitation

Which of these surfaces has the least amount of friction?
a) sand
b) metal
c) wood
d) ice

Calculate the acceleration of an object with a mass of 10 kg acted upon by a net force of 20 N.
a) 30 m/s^2
b) 0.5 m/s^2
c) 2.0 m/s^2
d) 200 m/s^2

When two objects collide in the absence of friction,
a) the total momentum changes.
b) the total momentum stays the same.
c) one object always gains momentum.
d) both objects lose momentum.

When a golf ball and a baseball are dropped from a meter above the floor, the
a) golf ball will hit first.
b) baseball will hit first.
c) object with the greatest mass will hit first.
d) golf ball and baseball will hit at the same time.

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