Describing Motion and Force

Suppose a bulldozer is being hauled at 50 km/h to a construction site on the back of a flatbed truck. From which reference point would the bulldozer not appear to be moving?

• A. the road

• B. a traffic light

• C. the truck driver

• D. a roadside tree

Carmen is helping load furniture and boxes onto a moving truck. She picks up boxes of her things, places them on a cart, and pushes the cart to the moving van. Which term best describes the type of force Carmen uses?

• A. contact

• B. friction

• C. gravity

• D. noncontact

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NGSS.3-PS2-1

Ahmed saw all of these things as he walked to school this morning. Which one is an example of a force pushing downward toward the ground?

• A. A bird sat on a telephone wire.

• B. A woman moved her child from one place to another in a wagon.

• C. A man pulled weeds in his garden.

• D. A dog tugged on a rope a child held.

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NGSS.5-PS2-1

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?

• A. Gravity pushes the can toward the magnet.

• B. The force between the can and the magnet is a noncontact force.

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

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

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NGSS.MS-PS2-5

Keisha has two large dogs and a small dog. The dogs like to play tug-the-rope together. Each of these three diagrams shows one way that the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope.

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 which direction the rope will move?

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

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

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

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

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Keisha has two large dogs and a small dog. The dogs like to play tug-the-rope together. Each of these three diagrams shows one way that the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope.

Explain whether the forces shown in each diagram are balanced or unbalanced. Use math-based evidence to support your claim for each diagram.

• A!!! there are three illustrations of two dogs pulling at a toy rope. the left art should show two big dogs pulling on a rope toy each pulling with a force of 20n in the opposite direction. the middle art shows a big dog on left pulling to the left on the rope toy with a force of 20n and a little dog pulling to the right with a force of 12n. the right art shows the rope toy tied to a post, with both dogs pulling on different parts of the toy and in the same direction. one large dog pulls with a force of 20 n and the small dog pulls with a force of 12 n.

• Write what is on A!!!

• Write what is on A!!!

• Write what is on A!!!

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NGSS.MS-PS2-1

NGSS.MS-PS2-2