5.6D Force and Motion

Some students attach a balloon to a straw and then they tape the straw to the top of a toy car. The students inflate the balloon and release the car. The car travels 40 centimeters across the floor. What should the students do to determine whether the force of the air from a balloon is enough to push the car 40 centimeters across the the same floor in repeated trials?

• Test the car several times using an identical balloon filled with different amounts of air.

• Test the car several times using different-sized balloons filled with the same amount of air.

• Test the car several times using an identical balloon filled with the same amount of air.

• Test the car several times using different-sized balloons with different amounts of air.

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A student uses a spring scale to pull a 50-gram block horizontally across a wood desk. Then the student pulls the block the same distance across surfaces of carpet, sandpaper, and glass. Which question is this investigation most likely designed to answer?

• How do blocks of different sizes react to force?

• How do different surfaces affect the amount of force needed to move a block?

• How do blocks affect spring scales?

• How does the mass of a block change when it is pulled across a desk?

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NGSS.MS-PS2-2

A student designs an experiment to test the force of spring using a spring launcher and four spheres with the same diameter but with different masses. What other piece of equipment would be most useful for this experiment?

• A graduated cylinder to measure a volume of each sphere before the sphere is launched.

• A beaker to collect the spheres after they have been launched

• A stopwatch to measure how long it takes to load each sphere on the spring

• A meter stick to measure the height each sphere reaches after the sphere is launched

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The students drop the same heavy ball onto identical blocks of soft clay from different heights. For each height they measure the depth of the dent the ball makes in the clay. Why is the depth of the dent different in each trial?

• The size of the ball changes

• The material of the ball changes

• The mass of the ball when it hits the clay changes

• The force of the ball when it hits the clay changes

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What is the force that slows down or eventually stops an objects motion?

• Gravity

• Push

• Motion

• Friction

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The location of an object.

• Speed
• Position
• Friction
• Gravity

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A polar bear slides down an ice covered hill. As he slides, he slows down. Eventually he comes to a stop. What force  acts on an object to slow or stop its motion?

• Speed
• Friction
• Gravity
• Direction

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NGSS.MS-PS2-2

A student drops a ball from shoulder height. The ball bounces 5 times before coming to a stop. What force causes the ball to fall to the ground?

• Friction
• Magnetism
• Position
• Gravity

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When conducting an experiment, in order to get reliable results, it is important to:

• Disregard results that do not match your hypothesis
• Test many different variables at the same time
• Test all forces at the same time
• Repeat the investigation several times

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Looking at the picture, what two tools would be needed to measure the effect of friction on the ball?

• Hand lens and balance
• Balance and spring scale
• Measuring tape and stop watch
• Spring scale and hand lens

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NGSS.MS-PS2-2