Day 4 STAAR® Blitz Exit Ticket: Changes in Motion

Speeding up, slowing down, or changing directions

• Acceleration

• Newton’s first law

• Newton’s second law

• Newton’s third law

Answer explanation

Acceleration refers to the change in velocity, which includes speeding up, slowing down, or changing directions. Therefore, the correct answer is Acceleration.

Tags

NGSS.MS-PS2-2

States that for every action, there is an equal and opposite reaction

• Acceleration

• Newton’s first law

• Newton’s second law

• Newton’s third law

Answer explanation

Newton's third law states that for every action, there is an equal and opposite reaction. This principle explains how forces interact, making it the correct choice among the options provided.

States that an object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an unbalanced force

• Acceleration

• Newton’s first law

• Newton’s second law

• Newton’s third law

Answer explanation

The statement describes Newton's first law, which states that an object at rest remains at rest and an object in motion continues in motion unless acted upon by an unbalanced force. Thus, the correct answer is Newton’s first law.

States that the acceleration of an object depends on the mass of the object and the net force acting on the object

• Acceleration

• Newton’s first law

• Newton’s second law

• Newton’s third law

Answer explanation

Newton’s second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This law is fundamental in understanding how forces affect motion.

Tags

NGSS.HS-PS2-1

A student sets up an experiment to investigate Newton’s laws of motion. She places a bowl filled with water on top of a wooden cart and applies a force by pushing it forward. According to Newton’s first law, what happens to the water in the bowl just after the cart stops?

• Because of inertia, the water moves backward.

• Because of friction, the water moves forward.

• Because of inertia, the water moves forward.

• Because of friction, the water moves backward.

Answer explanation

According to Newton's first law, an object in motion stays in motion. When the cart stops, the water, due to inertia, continues moving forward, resulting in the water spilling over the front of the bowl.

A volleyball player spikes a 0.5 kg volleyball with a force of 12.2 newtons. Assuming no resistive forces are acting on the ball, what is the acceleration of the volleyball to the nearest m/s²?

Answer explanation

To find acceleration, use F = ma. Rearranging gives a = F/m. Here, a = 12.2 N / 0.5 kg = 24.4 m/s². Rounding to the nearest m/s² gives 24. The correct answer is not 0.

Tags

NGSS.MS-PS2-2

The table shows the motion data for two objects during two trials of an investigation. Which object travels at the greater average speed?

• Object 1, because it travels the greater distance per unit of time

• Object 1, because it travels the longer amount of time

• Object 2, because it travels the shorter amount of time

• Object 2, because it travels the shorter distance per unit of time

Answer explanation

Object 1 travels at a greater average speed because it covers a greater distance per unit of time compared to Object 2. Average speed is calculated as distance divided by time.

Tags

NGSS.MS-PS3-1

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

• A

• B

• C

• D

Answer explanation

The action-reaction pair involves the bird exerting a downward force on the fence post due to its weight, while the fence post exerts an equal and opposite force upward on the bird, illustrating Newton's third law of motion.

Tags

NGSS.MS-PS2-2