What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object from the opposite direction

• a force that continually acts on the object in the direction the object is moving

• an increase in the mass of the object

• a decrease in the mass of the object

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A pencil falls off of a desk. What moves the pencil toward the floor?

• mass

• friction

• gravity

• speed

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A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is

most responsible for causing the wagon to stop?

• gravity acting on the wagon

• friction acting on the wagon

• the mass of the wagon

• the mass of the child

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NGSS.MS-PS2-2

A wagon is pushed in a straight line. How would an increase in friction on the

wagon wheels affect the wagon?

• It would cause the wagon to move faster.

• It would cause the wagon to change mass.

• It would cause the wagon to change direction.

• It would cause the wagon to slow down.

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Which best explains why a bicycle slows down when its brakes are applied?

• The brakes heat the rubber on the bicycle tires.

• The brakes add energy to the bicycle.

• The brakes increase the force of gravity on the bicycle.

• The brakes cause frictional forces on the wheels of the bicycle.

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NGSS.MS-PS2-2

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A ball is kicked and rolls along a level field until it comes to a stop. What is most

responsible for the ball coming to a stop?

• air

• gravity

• mass

• friction

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NGSS.MS-PS2-2

What causes a wagon to speed up when going down a hill?

• gravity

• friction

• air pressure

• mass

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A girl walked for 30 minutes. She noticed that she traveled farther in the first 15

minutes of her walk than in the second 15 minutes. What can she conclude about

her walk?

• She walked over many hills.

• Her average speed was faster during the first half of her walk.

• She walked in two different directions.

• She was walking at a constant speed.

A runner measured the time it took him to run 5 km. What can he calculate from

the distance and time measurements?

• direction

• mass

• speed

• force

If a car is moving backward along a road, can its speed be measured?

• Yes, it can, because the car does not have friction acting on it.

• Yes, it can, because the car travels a distance in a certain amount of time.

• No, it cannot, because speed can only be measured if the car is moving

  forward.

• No, it cannot, because the distance traveled backward by a car cannot be

  measured.