# Newton's Laws Of Motion: Question Preview (ID: 21741)

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When an unbalanced force acts on an object, the force
a) is equal to the weight of the object.
b) changes the motion of the object.
c) does not change the motion of the object.
d) its canceled by another force.

According to Newton's second law of motion, force is equal to mass times
a) inertia.
b) acceleration.
c) weight.
d) direction.

When a soccer ball is kicked, the action an reaction forces do not cancel each other out because
a) the forces act at the different times.
b) the force of the foot on the ball is bigger than the force of the ball on the foot.
c) the forces act on two different object.

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

Which of the following has kinetic energy?
a) a car waiting at a red light
b) a rock poised for a fall
c) an archer’s bow that is drawn back
d) a rolling bowling ball

Unlike kinetic energy, potential energy is
a) not measurable.
b) energy of motion.
c) conserved.
d) stored.

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.

A change from one form of energy into another is called
a) gravitational potential energy.
b) conservation of energy.
c) an energy transformation.
d) work.

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

The force that one surface exerts on another when the two rub against each other is called
a) inertia.
b) gravity.
c) friction.
d) acceleration .

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

Objects falling through air experience a type of friction called
a) terminal velocity.
b) rolling friction.
c) inertia.
d) air resistance.

According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail
a) exerts an equal force back on the hammer.
b) disappears into the wood.
c) creates a friction with the hammer.
d) moves at a constant speed.

Balanced forces acting on an object
a) never change the object’s motion.
b) always change the object’s motion.
c) sometimes change the object’s motion.
d) are not related to motion.

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

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

If the speed of an object does NOT change, the object is traveling at a
a) increasing speed.
b) constant speed.
c) average speed.
d) decreasing speed.

Changing direction is an example of a kind of
a) speed.
b) velocity.
c) constant rate.
d) acceleration.

A person traveling in a car that stops suddenly keeps moving forward due to
a) inertia.
b) gravity.
c) air resistance.
d) net force.

The overall force on an object after all the forces are added together is called the
a) net force.
b) inertia.
c) acceleration.
d) air resistance.

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