Calculating Power to Overcome Friction

This video tutorial explains how power is required to overcome friction when moving an object. It covers the forces acting on an object, including weight and normal force, and how to calculate the friction force. The video also demonstrates how to calculate the power needed to maintain constant speed against friction, using the formula power equals force times velocity. The example provided involves a 40 kg object moving at 10 meters per second with a friction coefficient of 0.5, resulting in a power requirement of 1960 watts or 2.6 horsepower.

What is the coefficient of friction between the object and the surface in the given scenario?

• 0.3

• 0.5

• 1.0

• 0.7

What is the mass of the object being pushed?

• 20 kg

• 30 kg

• 40 kg

• 50 kg

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NGSS.HS-PS2-1

Which force acts downward on the object?

• Applied force

• Normal force

• Friction force

• Weight

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What is the direction of the friction force relative to the motion of the block?

• No specific direction

• Perpendicular

• Opposite direction

• Same direction

What is the formula for friction force in terms of normal force and coefficient of friction?

• Friction force = normal force * coefficient of friction

• Friction force = normal force / coefficient of friction

• Friction force = normal force + coefficient of friction

• Friction force = normal force - coefficient of friction

What is the formula for power in terms of force and velocity?

• Power = force / velocity

• Power = force * velocity

• Power = force + velocity

• Power = force - velocity

What is the value of gravitational acceleration (g) used in the calculations?

• 10.8 m/s²

• 11.8 m/s²

• 9.8 m/s²

• 8.9 m/s²

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NGSS.HS-PS2-4

What is the calculated power required to overcome friction in watts?

• 1460 W

• 2460 W

• 960 W

• 1960 W

How many horsepower is equivalent to the calculated power in watts?

• 1.6 HP

• 2.6 HP

• 3.6 HP

• 4.6 HP

What is the constant speed at which the object is being pushed?

• 20 meters per second

• 15 meters per second

• 10 meters per second

• 5 meters per second