STAAR Review Warm-Up 8.7A Calculating Force and Acceleration

A sledgehammer has a mass of 3.5 kilograms. What net force to the nearest whole newton, will a person need to apply to accelerate the sledgehammer at a rate of 4.0 m/s²?

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NGSS.MS-PS2-2

Four students designed and built air propelled rockets that were launched into the air. Their data are recorded in the in the table.

Which rocket had the greatest acceleration?

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

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NGSS.MS-PS2-2

A student pushes a 51.5 kilogram bookshelf across a smooth floor with a net force of 67 N.

What is the approximate acceleration of the bookshelf?

• 1.3 m/s²

• 3,450.5 m/s²

• 15.5 m/s²

• 0.77 m/s²

Tags

NGSS.MS-PS2-2

The diagram shows a duck swimming in a stream in the opposite direction the stream is flowing. The duck pushes against the water, so the water pushes the duck forward with 20 newtons of force. The water also exerts 15 newtons of resistive force against the duck.

Which statement best describes the resulting motion of the duck?

• The duck will stop moving.

• The duck will continue moving in its current direction.

• The duck will stop and then start moving again.

• The duck will move in the direction that the stream is flowing.

Tags

NGSS.MS-PS2-2

A mother and daughter press their hands together and then push apart while ice skating.

Immediately after they push away from each other, how does the motion of the mother and daughter change?

• The mother moves forward, and the daughter moves backward with a greater acceleration.

• Both move forward, but the mother moves with a greater acceleration.

• The mother moves backward, and the daughter moves forward with a greater acceleration.

• Both move backward, but the daughter moves with a greater acceleration.

Tags

NGSS.MS-PS2-1

The diagram 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