Newton's Laws and Balanced Forces Review

Look at the free-body diagram. Based on this, which direction is the object going to move?

• Up

• No motion

• Left

• Right

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NGSS.MS-PS2-1

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Are the forces acting on this object balanced or unbalanced? Is it moving or not moving?

• unbalanced; the object is not moving.

• unbalanced; the object is in motion

• balanced; the object is not moving

• balanced; the object is in motion

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NGSS.MS-PS2-2

Which is an example of Newton's 1st law?

• It takes more force to lift a brick than it does to lift a feather

• A ball will continue to roll around on the ground until the forces acting on it become balanced.

• The air is let out of a balloon and it flies around the room in the opposite direction.

According to Newton’s First Law of Motion, the object will only start to move if ______.

• the net forces acting on object equal zero (are balanced)

• an unbalanced force is applied to an object

• the upward force of the object is equal to its acceleration

• two forces that are equal and opposite are applied to the object

Which of the following is an example of Newton's 3rd law of motion?

• A baseball player swings at an approaching ball.

• A basketball thrown in the air falls to the ground.

• A soccer ball remains motionless until it is kicked by a player..

• An ice skater pushes off from a wall and moves backwards.

Force is...

• an invisible force that attracts and pulls objects towards each other

• a push or pull on an object that can cause a change in motion

• an object's tendency to do nothing or stay the same

• an object's resistance to motion; usually involves objects rubbing together

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Force = mass times acceleration. Example: An object with a larger mass will take more force to accelerate than a smaller object.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

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NGSS.MS-PS2-2

Look at the free-body diagram. Based on this, which direction is the object going to move?

• Up

• No motion

• Left

• Right

Read the following scenario: Mario wants to see how mass affects acceleration. He tests a 100g ball and a 200g ball, and measures how fast each of them moves when rolled. Both objects are rolled with 20N of force. Which of the following is the DEPENDENT VARIABLE?

• the masses of the objects

• the distances the objects traveled

• the amount of force used to roll the objects

• the acceleration (speed) of the objects

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NGSS.MS-PS2-2

Read the following scenario: Mario wants to see how mass affects acceleration. He tests a 100g ball and a 200g ball, and measures how fast each of them moves when rolled. Both objects are rolled with 20N of force. Which of the following is the CONTROL (CONSTANT)?

• the masses of the objects

• the distances the objects traveled

• the amount of force used to roll the objects

• the acceleration (speed) of the objects