CW Newtons Laws

A jeep is coming to a stop at a red light. According to Newton's law of action-reaction, which of the following is true?

• The brakes do not apply a force to the wheels, but the wheels apply a force to the brakes.

• The brakes apply a force to the wheels, but the wheels do not apply a force to the brakes.

• The brakes apply a force to the wheels, and the wheels apply a force to the brakes.

• The brakes do not apply a force to the wheels, and the wheels do not apply a force to the brakes.

Tags

NGSS.MS-PS2-1

The diagram below shows a man fastened in a car seat while driving. Based on Newton's law of action-reaction, which arrow represents the force that the seat belt would exert on the man's body if he had to slam on the brakes?

• W

• X

• Y

• Z

Tags

NGSS.MS-PS2-1

A student pushes a 12 kg box across a smooth floor with a force of 36 N. There is no friction. Question: What is the acceleration of the box? a = F / m

• 3 m/s²

• 0.33 m/s²

• 48 m/s²

• 12 m/s²

Tags

NGSS.MS-PS2-2

A child pulls a 15 kg sled with a horizontal force of 45 N across smooth ice (ignore friction). The sled has added mass, now making it 30 kg. What is the acceleration of the sled with the added mass? a = F / m

• 3 m/s²

• 1.5 m/s²

• 0.33 m/s²

• 6 m/s²

Tags

NGSS.MS-PS2-2

Two friends, Ava and Diego, are riding a tandem bike with a combined mass of 80 kg (including the bike). They both pedal forward, exerting a total driving force of 250 N. The frictional force from the road acting against the motion is 70 N. What is the net force on the bike? What is the acceleration of the bike? a = F / m

• Net Force = 180 N Acceleration = 2.25 m/s²

• Net Force = 250 N Acceleration = 2.25 m/s²

• Net Force = 180 N Acceleration = 5 m/s²

• Net Force = 200 N Acceleration = 2.25 m/s²

Tags

NGSS.MS-PS2-2

An astronaut needs to move from one part of the space station to another to fix a satellite without using the handrails, just a push off of the space station interior. Which THREE of the following statements correctly describe the motion and forces involved in Maya's journey? Choose the best three answers.

• Maya and the spacecraft will move in opposite directions due to the action-reaction pair of forces.

• After the initial push, Maya will continue to move at a constant velocity due to the absence of significant forces in space.

• Maya will experience a continuous acceleration towards the satellite due to the satellites gravitational pull.

• Maya's mass determines how much force she needs exert to achieve a certain velocity change.

• Maya's momentum never changes through the entire process of moving.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The following demonstration shows a common experiment that represents Newton's 3rd Law. What is the initial ACTION here?

• air leaves the balloon and shoots backwards

• the balloon travels forward

• the string pulls the balloon

Tags

NGSS.MS-PS2-1

What is the REACTION in this example?

• The balloon travels forward in the same direction as the air.

• The balloon pushes off of the air, traveling forward

• The balloon travels forward due to the shrinking of the balloon

Tags

NGSS.MS-PS2-1

The diagram below shows a person applying an action force to a diving board. Which statement best applies to the reaction force?

• The reaction force is not as large as the action force.

• The reaction force acts in the same direction as the action force.

• The reaction force is greater than the action force.

• The reaction force acts in the direction opposite to the action force.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

A ball rolls along a flat surface and slowly comes to a stop. Which statement best describes the reason for the ball's change in motion?

• The force that keeps the ball rolling slowly decreases.

• The force of gravity gets stronger as the ball slows down.

• The ball's velocity decreases because of the force of friction.

• The ball's inertia is greater than the force applied to the ball.

Tags

NGSS.MS-PS2-2