9th Grade Cycle 1 CFA

Which option below would create equilibrium in the system? *

• Daniel and Maria should decrease their force by 3 newtons. .

• Daniel and Maria should pull with 2 more newtons.

• Bryan and Alyssa should pull with 2 more newtons.

• Daniel and Maria should decrease their force by 3 newtons.

Scenario: A tennis player hits two different tennis balls with the same force using the same racket. The first tennis ball has a mass of 100 grams, and the second tennis ball has a mass of 200 grams. Which of the following statements accurately represents Newton's second law of motion based on this scenario? Mark only one oval.

• A) The net force acting on an object is directly proportional to its acceleration and inversely proportional to its mass.

• B) The net force acting on an object is directly proportional to its mass and inversely proportional to its acceleration.

• C) The net force acting on an object is directly proportional to both its mass and acceleration.

• D) The net force acting on an object is inversely proportional to both its mass and acceleration.

If the net force applied to the car remains constant and its mass is tripled (while the force stays the same), how will the acceleration change according to Newton's second law of motion based on this scenario? Mark only one oval.

• A) The acceleration will triple.

• B) The acceleration will become one-third of the original.

• C) The acceleration will double.

• D) The acceleration will remain unchanged.

Imagine two identical vehicles, one with seat belts and one without. Both vehicles accelerate at the same rate. How does Newton's second law apply differently to passengers in these vehicles? Mark only one oval.

• A) Passengers in both vehicles experience the same forces.

• B) Passengers in the vehicle with seat belts experience greater forces.

• C) Passengers in the vehicle with seat belts experience lesser forces.

• D) Newton's second law doesn't apply to these situations.

Push a cart along a track so twice as much net force acts on it. If the acceleration remains the same, what is a reasonable explanation? Mark only one oval.

• The mass of the cart doubled when the force doubled.

• The cart experiences a force that it didn't before.

• The track is not level.

• Friction reversed direction.

What is the netforce on a dragster with a mass of 900 kg if its acceleration is 32.0 m/s squared west? Mark only one oval.

• A) 28.8 N west

• B) 14.4 N west

• C) 28,800 N west

• D) 14,400 N west

How does increasing the mass of the wagon affect the acceleration? *

• A) Increasing mass will decrease acceleration.

• B) Increasing mass will have no effect on acceleration.

• C) Increasing mass will increase acceleration.

• D) Increasing mass will initially increase, then decrease acceleration.

Imagine two cars, one with a mass of 1,000 kg and the other with a mass of 2,000 kg. If both cars experience the same net force, which car will accelerate more? Mark only one oval.

• A) The car with a mass of 1,000 kg.

• B) The car with a mass of 2,000 kg.

• C) Both cars will accelerate the same amount.

• D) Neither car will accelerate.

Consider a rocket of mass 500 kg being launched into space with a net force of 2000 N pushing it upwards. Calculate the acceleration of the rocket using Newton's second law. Mark only one oval.

• A) 2 m/s²

• B) 4 m/s²

• C) 10 m/s²

• D) 20 m/s²