8.6A and 8.6C STAAR Practice

An unbalanced force of 32 newtons is shown acting on an 8.0-kilogram object. Based on this information, complete the sentence to predict the motion of the object. Enter your answer in the box. Your answer must be a whole number. As lon as the force acts on the object, the object will continue to move toward the east and its velocity will increase by ____.

Tags

NGSS.MS-PS2-2

Carts of different masses are pulled along a flat surface. The table shows some variables for each cart. Which two carts experience the same net force?

• Carts 1 and 2

• Carts 1 and 3

• Carts 2 and 3

• Carts 2 and 4

Tags

NGSS.MS-PS2-2

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/s squared?

Tags

NGSS.MS-PS2-2

Four students designed and build air propelled rockets that were launched into the air. Their data are recorded in the table. Which rocket had the greatest acceleration?

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

Tags

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/s squared

• 3,450.5 m/s squared

• 15.5 m/s squared

• 0.77 m/s squared

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 stop and then start moving again.

• The duck will continue moving in its current direction.

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

Tags

NGSS.MS-PS2-2

A toy truck is at rest on the floor. Which statement describes the forces acting on the toy truck?

• The forces are balanced so motion occurs.

• The forces are balanced so no motion occurs.

• The forces are unbalanced so motion occurs.

• The forces are unbalanced so no motion occurs.

A plastic tube is arranged on a lab tabletop as shown. A small sphere enters one end of the tube with enough speed to come out the other end of the tube. Which diagram shows where the sphere will go first when it leaves the tube?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A 1.5-kilogram block is pushed rapidly and released. The block continues to slide some distance until it comes to a stop. The figure shows the block after it has been released and before it comes to a stop. Name the forces that directly affect the block's motion both before and after the block has been released. Describe the effects of each force named.

Tags

NGSS.MS-PS2-2

A photograph of a bird perched ona fence post is shown. Which description best identifies the action-reaction pair between the bird and the fence post?

• Action: The force of the bird on the wires.

  Reatction: The force of the wires on the fence post.

• Action: The force of the wires on the fence post.

  Reaction: The force of the fence post on the bird.

• Action: The force of the fence post on the bird.

  Reaction: The force of the bird on the wires.

• Action: The force of the bird on the fence post.

  Reaction: The force of the fence post on the bird.

Tags

NGSS.MS-PS2-1