Scientific Inquiry
Is the statement “The cart travels 2 meters” objective or subjective?
Objective
Which metric prefix means one thousand?
Kilo
What is the SI unit for velocity?
meters per second
What law explains action and reaction forces?
Newton’s Third Law
Which is measured in kilograms: weight or mass?
mass
Is “The liquid is blue” qualitative or quantitative?
Qualitative
What is the SI unit for electric current?
ampere
Which quantity necessarily changes when an object speeds up?
Velocity and speed
What is the relationship between mass and inertia?
More mass means more inertia
A student says an object cannot be accelerating if it is moving at constant speed.
Explain why this statement can be false.
Acceleration can occur due to a change in direction.
Two students observe the same experiment. One says, “The result is surprising,” and the other records “The object moved 2.3 m.”
Which statement is scientific, and why?
Answer: “The object moved 2.3 m” because it is objective, measurable, and testable.
Convert 2 micrometers to meters.
2*10^(-6) meters
An object changes velocity but not speed.
What must be happening to its motion?
Answer: Its direction is changing.
What happens when net force is unbalanced?
the object accelerates
An object is in equilibrium but is not at rest.
Is this possible? Why or why not.
Yes, balanced forces allow constant velocity motion.
Is “Mass affects acceleration” scientific or non-scientific?
scientific
Which unit combination equals one newton?
kg·m/s²
If time doubles and displacement stays the same, what happens to velocity?
It halves
Can friction exist without contact?
no
A person pushes on a heavy box, but the box does not move.
Is the net force on the box zero or nonzero? Explain.
The net force is zero because the applied force is balanced by friction.
A student says: “If an experiment supports a hypothesis once, the hypothesis is proven.”
Is this statement correct? Why or why not?
No, one experiment cannot prove a hypothesis; scientific knowledge is based on repeated testing and evidence.
Give two physical quantities whose units are derived units.
speed, velocity, acceleration, force and volume...
A motion graph shows a horizontal line on a velocity–time graph.
What does this say about the object’s net force?
net force is zero
A book is pushed against a wall and does not move.
Identify the forces acting on the book and explain why it remains at rest.
Gravity pulls down, friction acts upward, the applied force pushes into the wall, and the wall provides a normal force; forces balance so net force is zero.
A car travels at 36 km/h. Convert it to m/s.
10m/s