Use what you learned in the previous lesson to solve real-world problems.

Check what you understood with a short quiz.

Turn a measured distance and time into an average speed. Reason through why a runner, cart, or falling object can have one average speed even while its speed changes during the trip.

Use what you learned in the previous lesson to solve real-world problems.

Read acceleration as a change in speed over a time interval. Use everyday cases—speeding up, slowing down, and steady motion—to recognize when acceleration is present.

Use what you learned in the previous lesson to solve real-world problems.

Check what you understood with a short quiz.

Trace what happens to a dropped object near Earth when air resistance is small: it gains about 10 meters per second of downward speed each second.

Use what you learned in the previous lesson to solve real-world problems.

Estimate how far an object falls after 1, 2, or 3 seconds using the idea that its speed keeps increasing. See why fall distance grows faster than time, not in equal steps.

Use what you learned in the previous lesson to solve real-world problems.

Check what you understood with a short quiz.

Compare a stone, a feather, and a crumpled paper ball to separate gravity’s downward pull from air resistance. Predict when shape and speed make falling objects deviate from the simple falling rule.

Use what you learned in the previous lesson to solve real-world problems.

Read a position-time graph by looking at its slope: flat means not moving, a steady slope means steady speed, and a curve means changing speed. Connect each graph shape to a visible motion.

Use what you learned in the previous lesson to solve real-world problems.

Check what you understood with a short quiz.

Read a speed-time graph for falling and non-falling motion. Use the graph’s height to identify speed and its tilt to tell whether the object is accelerating.

Use what you learned in the previous lesson to solve real-world problems.

Use a simple motion table with time, position, speed, and acceleration columns. Fill in missing values from easy measurements and check whether the pattern looks like steady motion or falling motion.

Use what you learned in the previous lesson to solve real-world problems.

Check what you understood with a short quiz.

Measure weight as the downward pull shown by a spring scale or bathroom scale. Compare common weight units and recognize that a scale reading depends on gravity acting on the object.

Use what you learned in the previous lesson to solve real-world problems.

Use a balance to compare two objects without needing to know their exact weights. Reason through why equal pulls on both sides make the beam level and unequal pulls make it tip.

Use what you learned in the previous lesson to solve real-world problems.

Check what you understood with a short quiz.

Review this chapter with practice based on your mistakes.