Science End of the Year

Look at the middle diagram, where the large dog and the small dog tug on the rope. Which statement correctly explains the amount and direction of the net force acting on the rope, and in which direction the rope will move?

• The net force is 8 N to the left, and the rope will move to the right.

• The net force is 8 N to the left, and the rope will move to the left.

• The net force is 32 N to the left, and the rope will move to the left.

• The net force is 32 N to the right, and the rope will move to the right.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Mr. Wang works in a recycling center. Recyclable materials arrive at the center mixed together. Workers use magnets to separate steel cans from other items. Which two statements are true about the force between a steel can and a magnet?

• Gravity pushes the can toward the magnet.

• The force between the can and the magnet is a non-contact force.

• The attraction between the can and the magnet is a pull.

• The attraction between the can and the magnet is a push

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NGSS.MS-PS2-5

Which of the following objects will change speed the slowest when the same force is applied?

• an 8 kg bicycle

• a 1 kg toy truck

• a 20 kg wagon full of sand

• a 2 kg playground ball

Tags

NGSS.MS-PS2-2

How far down the lane, was the ball after two seconds?

• 6 M

• 9 M

• 12 M

• 15 M

Tags

NGSS.MS-PS3-1

Vivian went on a bicycle trip through Germany with her family. One afternoon, she rode her bicycle along a long, flat road at a constant speed for 24 kilometers (km). The ride took her 1.2 hours (h). At what speed did she ride her bicycle?

• 0.05 h/km

• 20 m/h

• 20 km/h

• 28.8 km•h

Miko is blowing up balloons for her little sister’s birthday party. One of the balloons slips out of her hand before she ties it off, and it shoots through the air until it is empty. Which statement explains what caused the balloon to accelerate?

• The air leaving through the balloon's mouth pulls the balloon in the same direction as the exiting air, so the balloon experiences a net force.

• All air surrounding the balloon pushes the balloon forward.

• The mass of the air leaving the balloon is greater than the mass of the balloon, so the balloon moves forward

• When the balloon pushes on the leaving air, the leaving air pushes back on the balloon, so the balloon experiences a net force.

Tags

NGSS.MS-PS2-1

The bumpy pattern on the soles of shoes is called the tread. Melanie and Keisha are at the store looking at the treads on different basketball shoes. They want new shoes so that they do not slide around on the basketball court. Which of these situations produces the most friction between the shoes and the floor?

• a girl with less mass wearing shoes with more tread

• a girl with less mass wearing shoes with less tread

• a girl with greater mass wearing shoes with more tread

• a girl with greater mass wearing shoes with less tread

Tags

NGSS.MS-PS2-2

Two school classes are playing tug-of-war with a rope. One class pulls on the rope with a 75 N force to the left, while the other pulls with a 40 N force to the right. Which two statements describe this situation?

• The forces are balanced, and the rope does not move.

• The forces are unbalanced, and the rope will move to the left

• The net force on the rope is 115 N to the right

• The net force on the rope is 35 N to the left.

Tags

NGSS.MS-PS2-2

Which of the following statements correctly defines Newton's 3rd Law of motion?

• Force equals the mass of an object times the object’s acceleration.

• For every action force, there is an equal and opposite reaction force.

• A moving object will stay in motion in a straight line due to its inertia.

• An object at rest tends to stay at rest until affected by an outside force

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NGSS.MS-PS2-1

A slingshot is a great example of Newton's Laws of Motion. Which statement below is TRUE? Read carefully, only one is correct.

• a. The marshmallow is at rest, and will stay at rest until a balanced force acts on it.

• The more force added to the slingshot, the less the marshmallow will accelerate.

• The action pulling/releasing the rubber bands results in the reaction of the marshmallow accelerating forward.

• You can calculate the amount of force needed by using the following equation: f=m/a

Tags

NGSS.MS-PS2-1