STAAR Review

The diagrams show forces acting on a toy car as it moves to the right. Which diagram shows the toy car that will most likely accelerate to the right based on these conditions?

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A pitcher throws a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10 newton force to the ball. Which statement correctly describes the reaction force between the bat and the ball?

• the reaction force is the force that causes the ball to move toward the bat

• the reaction force is the force applied to the bat by the player holding the bat

• the reaction force is the force that pulls the ball toward the ground

• the reaction force is the force of the ball on the bat

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NGSS.MS-PS2-1

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NGSS.MS-PS3-1

• moving at a constant speed

• accelerating

• moving toward the north

• stopped

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NGSS.MS-PS3-1

Samuel kicks a soccer ball across a grassy field and it eventually comes to a stop. If Newton’s law of inertia is true, why did the ball stop?

• Newton’s law only applies to objects at rest. 

• The mass of the ball is not great enough to have inertia. 

• Friction with the grass applies a net force on the ball causing it to decrease its speed. 

• Gravity slowed the ball until it came to a stop. 

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NGSS.MS-PS2-2

A ball at the top of a hill has ________ ________ because if pushed it will roll down the hill.

• Mechanical Force

• Unbalanced Energy

• Potential Energy

• Unbalanced Force

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NGSS.MS-PS3-2

When a student runs and kicks a ball, they have applied an ___________ force to move the ball.

• Balanced

• Magnetic

• Spring

• Unbalanced

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NGSS.3-PS2-1

Standing in line is an example of a ________ ________ since you are not moving forward, backward, or sideways.

• negative acceleration

• balanced force

• unbalanced force

• 1st law of motion

Which is newtons 3rd law

• for every thing there is reaction

• for every reaction there is a unusual action

• For every reaction there is an equal and opposite reaction

• for every reaction there is an good action

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NGSS.MS-PS2-1

Which is newtons 2nd law

• Acceleration is a change in speed

• Acceleration is a change in action

• Acceleration is a change in name

• Acceleration is a change in velocity

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NGSS.MS-PS2-2