Download Unit 06 Test Study Guide Part I. Force and Motion Review the Unit

Unit 06 Test Study Guide
Part I. Force and Motion
Review the Unit 05 Study Guide. There are some problems and vocabulary on it that are good study problems
for this test, too.
Part II. Newton’s First Law
1. Explain Newton’s First Law of Motion.
Newton’s First Law of Motion, also known as the Law of Inertia, states that an object at rest will
remain at rest until acted on by an unbalanced force, and an object in motion will remain in motion
with a constant direction and speed until acted on by a unbalanced force. Basically, this means that
an object will maintain whatever kind of motion it is undergoing, until an unbalanced acts on the
object to change its motion.
2. Inertia is an object’s tendency to resist changes in motion. If no outside force is applied to an object moving
at 5 m/s
a. What will happen to its speed over the course of the trip?
It will maintain a constant speed of 5 m/s in a constant direction, if no outside force is applied.
b. What will be its acceleration during the trip?
Its acceleration will be 0 m/s/s, since its velocity is constant.
3. If a small child is sitting on the handlebars of a bike, and the bike stops suddenly, what will happen to the
child?
a. It stays stationary.
b. He will go straight up.
c. He continues to move forward.
d. He moves backwards.
C; the Law of Inertia says that he will continue his motion forward until an unbalanced force acts to change it.
4. What is the name of Newton’s law that explains why the child in problem 3 moves the way he does when
the bike stops?
The Law of Inertia, Newton’s 1st Law
Part III. Newton’s Second Law of Motion
5. What is the formula that summarizes Newton’s Second Law?
Force = mass x acceleration; this law shows the relationship between force, mass, and acceleration.
6. What causes the force (weight) of an object at rest to increase as its mass increases, if the object is at rest?
The acceleration of gravity (9.8 m/s/s) acts on the object’s mass, increasing its force.
Part IV. Newton’s Third Law of Motion
7. What is Newton’s Third Law of Motion called? Explain it.
Newton’s Third Law is also called the action-reaction law. It states that every force has an equal but opposite
(in direction) force acting against it.
8. Draw arrows to show the action and reaction forces of a skateboarder making a jump.