Newton's Laws and Forces Mastery Bell Ringer

A student pushes a skateboard forward with a force of 25 N. The skateboard and rider together have a mass of 50 kg. What is the acceleration of the system?

• 0.5 m/s²

• 2.0 m/s²

• 25.0 m/s²

• 50.0 m/s²

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A 2,000 kg truck and a 1,000 kg car experience the same amount of force. According to Newton’s Second Law, which statement is true about their acceleration?

• The car will accelerate at half the rate of the truck.

• The car will accelerate twice as fast as the truck.

• Both vehicles will accelerate at the same rate.

• The truck will accelerate twice as fast as the car.

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A rocket launches into space. Which Newton’s Law best explains why the exhaust gases push downward while the rocket moves upward?

• First Law – Objects in motion stay in motion.

• Second Law – Force equals mass times acceleration.

• Third Law – Every action has an equal and opposite reaction.

• None of Newton’s Laws apply to this situation.

A soccer player kicks a ball with a force of 15 N. The ball, with a mass of 0.5 kg, accelerates across the field. However, after a few seconds, the ball slows down. Analyze why the ball does not continue moving at the same speed indefinitely.

• The ball stops due to Newton’s Third Law, which states forces always act in pairs.

• The ball slows down because of friction, which is an unbalanced force acting against motion.

• The ball has no force acting on it after being kicked, causing it to slow down.

• The mass of the ball is too small to continue moving on its own.

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Engineers are designing a new safety system for a roller coaster. They need to apply Newton’s Laws to ensure rider safety. Which of the following design features would best demonstrate Newton’s First Law?

• Adding seat belts and restraints to keep passengers in place.

• Reducing the mass of the coaster to increase acceleration.

• Installing a launch system that exerts a greater force to accelerate the coaster.

• Using larger wheels to reduce rolling friction.

A box is pushed to the right with a force of 40 N while friction applies a 10 N force to the left. What is the net force and direction of motion?

• 30 N to the right

• 50 N to the right

• 30 N to the left

• 50 N to the left

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A skydiver falls at a constant speed of 54 m/s. Which of the following best explains the forces acting on the skydiver?

• The force of gravity is greater than air resistance.

• Air resistance is greater than gravity.

• The forces are balanced, so the skydiver moves at a constant velocity.

• The skydiver is experiencing unbalanced forces that keep them in motion.

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A student pushes a chair with 15 N of force. At the same time, another student pushes the chair in the opposite direction with 10 N of force. What will happen to the chair?

• The chair will remain stationary because the forces are balanced.

• The chair will move in the direction of the larger force with 5 N of net force.

• The chair will move in the direction of the smaller force with 5 N of net force.

• The chair will not move since both forces are acting on it at the same time.

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A team of scientists is designing a Mars rover that must move over rough terrain while minimizing wear and tear. Which factor should they consider when determining how the rover will respond to different forces?

• The mass of the rover, which will affect its acceleration when forces are applied.

• The shape of the rover, which determines how air resistance affects its movement.

• The color of the rover, which affects how much heat it absorbs from the Sun.

• The temperature on Mars, which will impact how the rover experiences gravity.

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A moving truck is carrying a large crate. If the truck suddenly stops, the crate slides forward. How does Newton’s Laws and net force apply to this scenario?

• The crate moves forward because the force of friction is acting in the direction of motion.

• The crate moves forward due to Newton’s First Law, which states objects in motion stay in motion unless acted on by an unbalanced force.

• The crate stops immediately when the truck stops due to Newton’s Third Law.

• The net force acting on the crate is balanced, so it moves at a constant speed.

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