Unit 3 Vertical Circular Motion

When a car is traveling over the top of a hill, the driver and passengers will have _____ compared to driving at the same speed on a flat road.

• a lower apparent weight

• the same apparent weight

• a higher apparent weight

• a lower or higher apparent weight depending on the height of the hill

When a car is traveling through a dip in the road, the driver and passengers will have ______ compared to driving the same speed on a flat road.

• a lower apparent weight

• the same apparent weight

• a higher apparent weight

• a lower or higher apparent weight depending on their speed

The occupants of a car traveling at a speed of 25 m/s note that on a particular part of the road their apparent weight is 20% higher than their weight when driving at 25 m/s on a flat road.

Is that part of the road a hill, or a dip?

• hill

• dip

When a car is traveling over the top of a hill, the driver and passengers will feel weightless when their velocity equals:

• gr

• -gr

• square root of gr

• g/r

A car is traveling at a velocity of 20 m/s over the top of a hill of radius 80 m. The driver's mass is 60 kg. What is the apparent weight of the driver at the top of the hill?

• 0 N

• 290 N

• 590 N

• 890 N

At what velocity must a car drive over a hill of radius 80 m if the driver and car are to appear weightless?

• 12 m/s

• 28 m/s

• 46 m/s

• 58 m/s

A pilot executes a vertical dive then follows a semi-circular arc until going straight up. At their lowest point, the normal force acting on the pilot is:

• less than mg and pointing up

• less than mg and pointing down

• more than mg and pointing up

• more than mg and pointing down