Net Force and Friction: Problem-Solving Techniques

This video tutorial covers various physics problems focusing on calculating net force, acceleration, and displacement. It begins with a 5 kg box subject to horizontal and frictional forces, leading to calculations of net force and acceleration using Newton's second law. The tutorial then explores kinematics to find the distance traveled by the box. A second problem involves a 12 kg box with an angled force, requiring trigonometry to find the net horizontal force. The final problem involves a car's acceleration and the forces acting on it, including friction and engine force. Each section provides step-by-step solutions to enhance understanding of these physics concepts.

What is the net horizontal force acting on a 5 kg box pulled by a 200 N force and opposed by a 60 N frictional force?

• 200 N

• 260 N

• 140 N

• 60 N

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NGSS.HS-PS2-1

According to Newton's second law, what is the acceleration of a 5 kg box if the net force acting on it is 140 N?

• 7 m/s²

• 14 m/s²

• 35 m/s²

• 28 m/s²

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NGSS.HS-PS2-1

How far will a 5 kg box travel in 15 seconds if it starts from rest and has an acceleration of 28 m/s²?

• 2800 meters

• 2250 meters

• 1500 meters

• 3150 meters

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NGSS.HS-PS2-1

What is the net horizontal force acting on a 12 kg box pulled by a 350 N force at a 30-degree angle and opposed by a 120 N frictional force?

• 150 N

• 303.1 N

• 230 N

• 183.1 N

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NGSS.HS-PS2-1

What is the acceleration of a 12 kg box if the net force acting on it is 183.1 N?

• 18.3 m/s²

• 12.5 m/s²

• 14.5 m/s²

• 15.26 m/s²

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NGSS.HS-PS2-1

What is the final speed of a 12 kg box after it has traveled 200 meters, starting from rest and accelerating at 15.26 m/s²?

• 70 m/s

• 50 m/s

• 60 m/s

• 78.1 m/s

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NGSS.HS-PS2-1

What is the acceleration of a 1200 kg car that speeds up from 25 m/s to 60 m/s in 5 seconds?

• 7 m/s²

• 12 m/s²

• 10 m/s²

• 5 m/s²

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NGSS.HS-PS2-1

What is the net force acting on a 1200 kg car if it accelerates at 7 m/s²?

• 12000 N

• 6000 N

• 8400 N

• 7000 N

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NGSS.HS-PS2-1

If a 1200 kg car experiences a constant frictional force of 3500 N, what is the average force exerted by the engines on the car?

• 15400 N

• 11900 N

• 3500 N

• 8400 N

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NGSS.HS-PS2-1

What is the net force in the x direction if a car's engine applies a force of 11900 N and friction opposes it with 3500 N?

• 3500 N

• 15400 N

• 8400 N

• 11900 N

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NGSS.HS-PS2-1