Introductory Centripetal Force Problem - Car over a Hill

The video tutorial explains the physics of a toy car moving over a semi-circular hill. It covers the conversion of mass units, the concept of tangential velocity, and the importance of summing forces in the correct direction for circular motion. The tutorial provides a step-by-step guide to solving free body diagram problems and applies these concepts to calculate the normal force on the car. The video concludes with a real-world application, explaining how the normal force changes with speed, similar to the experience on a roller coaster.

What is the mass of the toy car after converting from grams to kilograms?

• 0.0453 kg

• 453 kg

• 0.453 kg

• 4.53 kg

Which of the following is NOT a step in solving a free body diagram problem?

• Break forces into components

• Calculate the velocity

• Sum the forces

• Draw the free body diagram

In which direction should forces be summed for an object moving in a circle?

• Out direction

• In direction

• Y direction

• X direction

What is the formula for centripetal acceleration used in the problem?

• mass times acceleration due to gravity

• mass times tangential velocity

• tangential velocity squared over radius

• force normal minus force of gravity

What is the calculated normal force acting on the car at the top of the hill?

• 5.0 Newtons

• 3.8 Newtons

• 4.2 Newtons

• 4.4 Newtons

Why do you feel lighter when going over the crest of a hill?

• The force of gravity increases

• The radius of the hill increases

• The normal reaction force decreases

• The speed of the car decreases

Who explains the feeling of weightlessness at the crest of a hill?

• Bobby

• Billy

• Kit from Gorilla Physics

• The teacher