Calculating Forces and Masses

The video tutorial explains how to calculate the horizontal force Superman must apply to a boulder to achieve a specific acceleration. It covers finding the mass of the boulder using its weight and gravity, and then determining the horizontal force using Newton's second law. Additionally, it demonstrates calculating the net force required to accelerate a refrigerator, reinforcing the concept of force as mass times acceleration.

What is the initial problem involving Superman in the video?

• Superman stopping a train

• Superman flying over a city

• Superman throwing a boulder

• Superman lifting a car

How is the mass of the boulder calculated?

• By dividing the weight by the speed

• By multiplying the weight by gravity

• By adding the weight and gravity

• By dividing the weight by gravity

What is the mass of the boulder as calculated in the video?

• 250 kg

• 200 kg

• 285.71 kg

• 300 kg

What formula is used to calculate the horizontal force on the boulder?

• Force = mass + acceleration

• Force = mass / acceleration

• Force = acceleration / mass

• Force = mass * acceleration

What is the calculated horizontal force needed for the boulder?

• 1500 N

• 5000 N

• 4285.71 N

• 3000 N

What is the new problem introduced after the boulder problem?

• Measuring the height of a building

• Finding the force to lift a box

• Determining the force to accelerate a refrigerator

• Calculating the speed of a car

What is the mass of the refrigerator in the new problem?

• 100 kg

• 125 kg

• 150 kg

• 200 kg

What is the acceleration given for the refrigerator problem?

• 1.5 m/s²

• 1.2 m/s²

• 2.0 m/s²

• 1.0 m/s²

How is the net force calculated for the refrigerator?

• By dividing mass by acceleration

• By subtracting acceleration from mass

• By adding mass and acceleration

• By multiplying mass and acceleration

What is the net force required to accelerate the refrigerator?

• 150 N

• 250 N

• 100 N

• 200 N