What is inertia and how does it relate to motion?
Hint: Inertia is a property of matter. How does it affect an object at rest or in motion?

List two examples of action-reaction pairs from everyday life.
Hint: Remember, for every action, there is an equal and opposite reaction.

Explain the difference between mass and weight.
Hint: One is the amount of matter in an object, and the other is the force exerted by gravity on that object.

How does friction affect motion? Give an example.
Hint: Think about how surfaces interact when they slide against each other.

Calculate the force required to accelerate a 10 kg object at 2 m/s².
Hint: Use the formula F=m×a.

A car slows down from 80 km/h to a stop in 5 seconds. What is its acceleration?
Hint: First, convert the speed to m/s, then use a=Δv/Δt.

If the gravitational force on Earth is 9.8 m/s², what is the weight of a 50 kg object?

Hint: Weight is calculated as Weight=mass×gravity.

A force of 20 N acts on an object and causes an acceleration of 4 m/s². What is the mass of the object? Hint: Rearrange the formula F=m×a to find the mass.

Find the net force when two forces of 5 N and 3 N act in the opposite direction.

Hint: When forces act in opposite directions, they subtract.

How is Newton's Third Law of Motion related to his Second Law of Motion?

Hint: Think about how forces act in pairs and how acceleration is involved.

Prove that in Newton's Second Law of Motion, mass is inversely proportional to force when acceleration is constant.

Hint: Consider what happens to the force when the mass increases while acceleration stays the same.

Discuss how friction plays a role in walking.

Hint: Consider the interaction between your shoes and the ground.

Show how the unit of acceleration can be derived from its formula.

Hint: Break down the units of velocity and time in the acceleration formula.

An object is moving in a circle at a constant speed. Explain the role of centripetal force in this motion.

Hint: Think about what keeps the object moving in a circular path, rather than in a straight line.

A runner completes a 400-meter lap on a track, starting and finishing at the same point, in 50 seconds. What was the runner's average speed and average velocity?

Hint: Remember, speed is the total distance divided by time, while velocity considers displacement.

A student walks 3 km east, then 4 km north. What is the student's total distance traveled and displacement?

Hint: Total distance is the sum of all segments traveled, while displacement is the straight-line distance from the start to end point.

A car accelerates from rest to 60 km/h in 5 seconds. What is its acceleration?

Hint: Convert the speed to meters per second and then use the formula.

Assume you are charged for your taxi fare based on displacement. You started from home, traveled 100 km away, and then came back home. The taxi fare is 10 baht per km. How much do you have to pay?

A train travels 150 km in 3 hours, stopping for 30 minutes at a station midway. What is the train's average speed for the trip, and what could be its instantaneous speed after it resumes its journey from the station?

Hint: Average speed is total distance divided by total time (including stops). Instantaneous speed is the speed at a specific moment in time.