Q1: Define inertia.
A1: Inertia is the property of an
object that resists any change in its state of motion.
Q2: How is inertia related to mass?
A2: Inertia increases with mass;
objects with larger mass have greater inertia.
Q3: Why does a baseball require more force to stop
than a table tennis ball?
A3: Because the baseball has a
larger mass and therefore greater inertia.
Q4: Who formulated the laws of motion and how many
laws are there?
A4: Isaac Newton formulated three
laws of motion.
Q5: What is Newton’s first law also called?
A5: Newton’s first law is called the
Law of Inertia.
Q6: State Newton’s first law of motion.
A6: An object at rest remains at
rest, and an object in motion remains in motion with constant velocity in a
straight line unless acted upon by a net external force.
Q7: Why does a passenger move backward when a car
starts suddenly?
A7: Because the passenger’s body
resists the change from rest to motion due to inertia.
Q8: Why does a passenger move forward when a moving
car stops suddenly?
A8: Because the body resists the
sudden change in velocity and tends to continue moving.
Q9: What type of change does the body resist when a
car moves along a curved path?
A9: The body resists the change in
the direction of velocity.
Q10: Why is it difficult for a small boat to move a
large steamer?
A10: Because the steamer has a large
mass and therefore very large inertia.
Q11: Why does a rider move forward when a horse
stops suddenly?
A11: Because the rider’s body resists
the sudden change in motion due to inertia.
Q12: What physical quantity must act to change the
state of motion of an object?
A12: A net external force.