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Integrated Science: Grade 10
Activity: Newton’s First Law
Newton’s First Law of Motion
AIMS:
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Accurately describe and interpret situations involving Newton’s first law of
motion.
Understand the concept of inertia (mass)
Draw free body diagrams for balanced and unbalanced forces
Understand the concepts of and differences between mass and weight
INSTRUCTIONS:
Answer the following questions and take good notes when necessary. This assignment
will work well as a study guide if done neatly and properly. The solutions to this
assignment will be posted on Moodle later – be sure to check your answers to the
solutions.
Open http://www.physicsclassroom.com/Class/newtlaws/
Read Lesson 2a: Meaning of Force
Answer the following questions:
a. Define force, identify whether it is a vector or scalar quantity and state the
standard SI unit used for force.
b. What is a “normal” force?
c. Forces and other vectors are represented by arrows. Complete the following
sentence:
The length of the arrow represents the
of the arrow shows the direction the
of the force and the direction
is acting.
d. Distinguish balanced and unbalanced forces
Read Lesson 1a: Newton’s First Law
Answer the following questions:
a. State Newton’s first law – the law of inertia.
b. Complete the following sentence:
When forces are balanced the object has
there are no changes in motion when forces are balanced.
acceleration. Hence,
Integrated Science: Grade 10
Activity: Newton’s First Law
View the two Animations.
c. Use Newton’s first law to explain why the person and the ladder keep moving
after the vehicles come to an abrupt halt.
Read Lesson 1b: Mass and Inertia
Answer the following questions:
a. State the meaning of inertia.
b. Using the following diagrams write a detailed account of how Galileo came up
with the concept of inertia.
c. What did Newton derive from Galileo’s concept of inertia?
d. Identify the unbalanced force that stops objects continuing with constant speed
in a constant direction forever and ever.
e. How are mass and inertia related?
Integrated Science: Grade 10
Activity: Newton’s First Law
Answer the following additional questions.
Integrated Science: Grade 10
Activity: Newton’s First Law
Read Lesson 1c: State of Motion
Answer the following questions:
a. What do we mean by state of motion? Provide two examples: one at rest and
one for constant motion.
Read Lesson 1d: Balanced and Unbalanced Forces
Answer the following questions.
Integrated Science: Grade 10
Activity: Newton’s First Law