Forces & Motion
This force pulls objects toward Earth and causes two objects of different mass to fall at the same rate when air resistance is negligibl
What is gravity?
When iron and oxygen combine to create rust, what kind of change has happened?
What is a chemical change (a new substance formed)?
Why do metal pans often have handles made of plastic or wood?
What is because plastic and wood do not conduct heat well and protect hands from heat?
If you melt a 500 gram block of ice into water, what will the water weigh (ignoring evaporation)?
What is 500 grams?
A car travels 60 miles in 2 hours. What is the car’s speed in miles per hour?
What is 30 miles per hour?
When a parachute opens, it slows a skydiver because it increases this force opposing motion through the air.
What is air resistance (or friction with air)?
If you mix sugar in water and it seems to disappear but its mass stays the same, is this a new substance or the same substance dissolved?
What is the sugar dissolves but remains the same substance (a physical change)?
What happens to chocolate when it is heated enough?
What is it melts into a liquid?
You dissolve 50 grams of salt into 300 grams of water. What is the weight of the solution?
What is 350 grams?
Which choice best describes "position" — direction, location compared to a reference point, distance over time, or speed?
What is the location of an object compared to a reference point?
If you roll a ball on grass and then on a smooth floor, the ball rolls farther on the smooth floor because there is less of this force.
What is friction?
You mix oil and water and they do not make a new substance. Which word best describes this — mixture or chemical reaction?
What is a mixture?
When you place a balloon in a freezer, what happens to the air inside and the balloon's size?
What is the air inside contracts and the balloon gets smaller?
Which tool is best to measure the weight of an object before and after an interaction?
What is a balance scale?
A train travels 100 kilometers in 2 hours. If it continues at the same speed, how far in 5 hours?
What is 250 kilometers?
A ball is thrown up and slows, stops at its highest point, then falls down. Name the two forces involved and explain briefly how they act.
What are gravity and air resistance (gravity pulls down; air resistance slows upward motion)?
You mix baking soda and lemon juice and observe fizzing. What does that fizzing indicate?
What is a chemical reaction forming a new substance (gas produced)?
Why are metals commonly used for cooking pots?
What is because metal heats up quickly and spreads heat evenly?
If you bake a cake and notice it becomes lighter, give one likely explanation based on matter changing state.
What is water turned into steam and escaped?
If an object starts at rest and moves 20 meters in the first 4 seconds, what is its average speed in meters per second?
What is 5 meters per second?
A scientist drops a heavy metal ball and a lighter plastic ball (same size) from the same height and they land together. Explain why they land at the same time using the concept of forces and acceleration (ignore air resistance).
What is gravity causes the same acceleration for both objects, so they fall at the same rate?
Give one observation (from the list below) that usually indicates a new substance has formed: color change without added dye, substances separate after mixing, mixture is filtered, or mixture is stirred.
What is a color change without adding dye?
A candle is heated and the wax changes form. Name the change and what happens to the wax.
What is a physical change: the wax melts and can flow as a liquid?
Lucas has a toy truck with 4 identical blocks. The truck with blocks weighs 38 g and the truck alone weighs 22 g. How many grams does each block weigh? (Show work if needed.)
What is 38-22/4=4 grams per block?
Refer to the distance-time graph from the original packet (questions 5–7). By the end of the 2nd second the ball is at 2 feet; between which two seconds does the ball stop moving and remain at the same position; and what is the average speed between 0 and 2 seconds?
What is: end of 2nd second — 2 feet; the ball stops between 2 and 4 seconds; average speed between 0 and 2 s is 1 foot per second?