# 8th Grade First Semester Exam Review Part 3 Question Preview (ID: 22504)

### A Review Of Concepts From First Semester To Help Prepare For Exam.[print questions] Answers? Play games to get them!

A place or object used for comparison to determine if something is in motion is called
a) velocity.
b) a position.
c) a constant.
d) a reference point.

The rate at which velocity changes is called
a) motion.
b) direction.
c) acceleration.
d) the rate at which velocity changes.

The force that pulls falling objects toward Earth is called
a) air resistance.
b) free fall.
c) gravity.
d) acceleration.

Average speed is
a) equivalent to velocity.
b) the rate at which a slope changes.
c) the total distance traveled divided by the total time.
d) the rate at which an object is moving at a given instant.

The law of conservation of energy states that when one form of energy is converted into another,
a) no energy is destroyed in the process.
b) energy is destroyed in the process.
c) energy is created in the process.
d) some amount of energy cannot be accounted for.

The tendency of an object to resist change in its motion is known as
a) inertia.
b) balance.
c) mass.
d) force.

To determine the acceleration rate of an object, you must calculate the change in speed during each unit of
a) deceleration.
b) velocity.
c) motion.
d) time.

When you rub your hands together on a cold day, you use friction to convert
a) thermal energy into nuclear energy.
b) mechanical energy into thermal energy.
c) nuclear energy into electrical energy.
d) electrical energy into electromagnetic energy.

Which of these is an example of deceleration?
a) a bird taking off for flight
b) a roller coaster moving down a steep hill
c) an airplane following a straight flight path
d) a car approaching a red light

The overall force on an object after all the forces are added together is
a) inertia.
b) unbalanced force.
c) gravity.
d) net force.

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