Conductors and Insulators
Give an example of a material that would make a good conductor.
Possible answers: Metal, aluminum, nickel, copper, water. etc
True or false: A physical change creates a new substance.
False
A 50 lb rock was split into two pieces. What is a possible weight of piece 1 and piece 2?
Answer must add up to 50.
Which cart would need a stronger force in order to move?
-cart full of bricks
-cart full of feathers
Cart full of bricks.
What force causes a parachute to float in the wind to safely allow a skydiver to return to earth?
air resistance
Why is the handle of a cooking utensil often made out of rubber, but the spoon itself is made out of metal?
The handle is made out of rubber because rubber is an insulator and/or the metal is a conductor so heat will travel easily and the rubber protects your hand.
What two things are needed in order for something to be Matter?
-weight/mass and take up space
The ingredients of a cake are below:
-eggs: 2 grams
-flour/sugar/baking soda: 8 grams
-milk/butter: 3 grams
-icing: 5 grams
What is the total weight of the cake after it has been baked?
18 grams
What causes a balloon to fly forward when filled with air and then released?
Air is being pushed out of the balloon in the opposite direction.
A ball is dropped from a tall height. What causes the ball to fall to the ground?
Gravity
Which of the following is an insulator?
-penny
-sweater
-soda can
-sweater
A student claimed that when water freezes and turns to ice, it is a chemical change. Explain why they are wrong.
Possible answers: changes in state of matter are always physical; ice can be melted and turned back into water
A full water bottle has a mass of 35 grams. Some of the water is accidentally spilled on the ground. If the new weight of the water bottle is 15 grams. How much of the water was spilled?
20 grams
A student ran for 8 seconds at a speed of 4 feet/second. How far did the student run?
(Distance= Speed x Time)
32 feet
Why does a toy car travel farther on tile than on grass?
Less friction on tile/tile is slippery
Why are the outsides of charging cords for phones/laptops made out of rubber?
The rubber is an insulator, so it will protect you from getting hurt by the electrical wire.
Which of these would most likely indicate a chemical change:
-change in odor and bubbles forming
-change in shape
-being cut in half
-change in odor and bubbles forming
A pot of water weighed 75 grams. After it was boiled, it weighed 50 grams. What was the weight of the water vapor that left the pot?
25 grams
A soccer ball is rolling on a flat surface. What is a force that could stop the ball from rolling?
Possible answers: friction, someone kicking/pushing/picking up the ball, the ball running into something, etc
On a Distance-Time graph, you see a flat, horizontal line. What does this tell you about the speed of the object represented on the Distance-Time graph?
The object is stationary.