Force and Motion Part 2

An example of a simple machine is a –

• lever

• engine

• computer

• wagon

When force acts on an object the object will –

• change mass

• increase in size

• change speed, change direction, or both

• change physical state

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Jerry rolled a toy car across the classroom floor. As it was moving, the car was pushed by another student. The car MOST likely changed –

• direction

• mass

• size

• color

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Friction causes an object to change –

• mass

• speed

• size

• matter

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Which of the following surfaces would create the MOST friction?

• A glass tabletop

• A wooden table top

• A bed of rocks

• A tile floor

Janet performed an experiment in which she rolled a toy car across 5 surfaces. She recorded the results on the chart below.

According to Janet’s experiment, which surface had the LEAST friction?

• Glass

• Grass

• Sand

• Pebbles

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According to Janet’s experiment, which surface had the MOST friction?

• Glass

• Steel

• Sand

• Pebbles

If another car was rolled across the same surfaces, it would probably roll the farthest on the –

• Glass

• Grass

• Sand

• Pebbles

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NGSS.MS-PS2-2

When a book is pushed off the edge of a table, it falls to the ground. This is because –

• it cannot fly

• it is pulled by gravity

• wind forces it down

• a magnet pulls it down

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Mr. Jackson dropped four cylindrical objects off a tower. Each object had a different mass. He recorded the time it took each object to hit the ground on the chart below.

If an object with a mass of 30 kilograms was dropped from the same height, which of the following would be true?

• It would fall faster.

• It would fall slower.

• It would not fall.

• It would take 10 seconds to hit the ground.

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