Big Idea 13

• an iron nail

• an aluminum can

• the north end of another bar magnet

• the south end of another bar magnet

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• wind

• friction

• gravity

• cable tension

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To move the heavy box shown, Kylie and her friends lifted it onto a cart with wheels. Why was it easier to move the box by placing it on wheels than by sliding it?

• There was less mass.

• There was less friction.

• There was less density.

• There was less gravity.

When you drop an object, what causes it to fall to the ground?

• air resistance

• gravity

• the push from you

• magnetism

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You are pushing a box. The force is shown with an arrow. The box does not move. What keeps the box from moving even though you are pushing on it?

• You are pushing the box in the wrong direction.

• There is too much air resistance to move the box.

• The force of friction is opposing the force you exert.

  .

• The force of gravity is opposing the force you exert.

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. Felipe and Marsha were studying friction and decided to do an experiment. They place four equally sized blocks made of different materials on an elevated plastic tray. They watched the blocks move down the tray. Which block would experience the least amount of friction as it moved down the tray?

• ice block

• sponge block

• sandpaper block

• plastic block

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How does the mass of the shopping cart affect the amount of force needed to push the cart?

• The greater the mass of the cart, the faster it will travel when you push it.

• b. The lesser the mass of the cart, the less force required to push it.

• c)The greater the mass of the cart, the less force required to push it.

• The lesser the mass of the cart, the more force required to push it.

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Jamal is testing paper airplanes to see which design makes a plane fly farther. Jamal's first design has straight wings and his second design has bent wings. He threw his planes with the same amount of force. For each trial, he threw from the same location in the same direction. He did this six times for each plane, measuring how far each plane went from the starting line in meters. He decided that his second design with bent wings travels farther. What should he do next to see if his results are valid?

• He should throw planes in different locations.

• He should throw with his eyes shut each time.

• He should bend the wings up even more on his plane.

• He should have other friends replicate the same experiment.

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Julio and Tammy are moving a dresser. They are arguing about which direction to move it. Julio is pushing the dresser with a force of 5 Newtons towards Tammy. Tammy is pushing the dresser towards Julio with a force of 10 Newtons. What happens to the dresser due to the forces applied?

• The dresser does not move.

• The dresser moves towards Julio.

• The dresser moves towards Tammy.

• The dresser moves towards Tammy, then back towards Julio.

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What is the primary reason why a ball rolls down a slope?

• A) Air resistance

• B) Gravity

• C) Friction

• D) Magnetism

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