Unit 1: Balancing Forces

• Describe the direction the box is pushing on the table.

• Observing that the box is not moving. That means there are not forces acting on it.

• Hang weights from the hook. The weights will push on the box.

• Hang weights from the hook. The weights will pull on the box. The box will slide to the end of the table.

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Jai'Christian wants to move an object using touching forces. Which test will show that touching forces move objects?

• He could drop a feather from several different heights and see how fast it falls.

• He could pull a toy car with a string until it hits another toy car.

• He could rub a balloon on his shirt and hold it over his head to make his hair stand up.

• He could use a magnet to pull a stack of paper clips from one end of the table to another.

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• It will go up.

• It will go down.

• It will go backwards.

• It will stay in the air.

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• It will stay on the left side.

• It will move higher each time it swings to either side.

• It will swing to the right side and then back to the left.

• it will stop in the middle before it reaches the right side.

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• Yes, since the opposite sides of the magnets are facing each other, they will repel each other.

• Yes, since the same sides of the magnets are facing each other, they will repel each other.

• No, because the opposite sides of the magnets are facing each other.

• No, because the same sides of the magnets are facing each other.

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A group of science students needs to teach their classmates about non-touching forces. They will do this by showing them a demonstration. To come up with ideas for their demonstration, the students come up with questions about non-touching forces. Which student asks the most useful question?

• Elaine asks about how many different ways a magnet can slide on a table.

• Elirah asks what color each of the magnets' sides are.

• Lamarcus asks there is a way to make the magnets stronger.

• Malaysia asks if they can make magnets move towards each other.

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Kevin plans an investigation using one magnet to pick up a pile of metal paper clips. He already knows that the paper clips will stick to the magnet because the two objects attract. Which question can Kevin answer by carrying out his investigation?

• What materials are used to make a magnet?

• Why do paper clips bend easily if they are made from metal?

• At what distance will the magnet be able to pick up the paper clip?

• What touching forces are making the paper clip stick to the magnet?

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Leaders in a city want to sort through the city's landfill to pick out metal cans that can be recycled. It would take a long time to do this work by hand. Engineers decide to build a big magnet to move above large piles of trash. Magnets attract metal. What do you thing the engineers believe will happen as a result of their plan?

• The magnets will draw the metal cans up and out of the trash piles.

• The magnet will cause the metal cans to move to the side into a neat pile.

• The magnet will flatten and recycle the cans while they are being collected.

• The magnet will use electricity to sort the metal cans from the nonmetal items.

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What conclusion can Juan make by looking at his data?

• Magnets will attract paper clips at any distance.

• Magnets will attract paper clips the farther they are from the magnet.

• Magnets will attract paper clips that are made of nonmental.

• Magnets will attract paper clips that are closer to the magnet.

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• The ball would pick up speed.

• The ball would soon stop bouncing.

• The ball would stay in the air longer.

• The ball would roll back to the student.

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