Vertical Force Problems

You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?

• Friction
• Centripetal Force
• Gravity
• Inertia

A particularly scary roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop is  13.2 m with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.

• 11.4 m/s
• 12.5 m/s
• 10.1 m/s
• 14.9 m/s

Tags

NGSS.HS-PS2-1

When the car is at the top of the loop it just maintains contact with the tract. What is the car's acceleration at this point?

• g upwards

• 0.5g upwards

• zero

• g downwards

Tags

NGSS.HS-PS2-1

The car just maintains contact with the track at the top of the loop. What is it's velocity at this point?

• Rg

• g/R

• Zero

• √Rg

Tags

NGSS.HS-PS2-1

A person is standing on a scale in an elevator accelerating downward. Compare the reading on the scale to the person's true weight.

• less than their true weight
• equal to their true weight
• greater than their true weight
• zero

Tags

NGSS.HS-PS2-1

Consider the case of vertical circular motion when you are riding in a Ferris Wheel. What is the correct expression that relates all the forces when you are at the top of the circle?

• F_{c = mg + Reaction}

• F_{c = mg - Reaction}

• F_{c = mg}

• F_{c =} -Reaction - mg

Tags

NGSS.HS-PS2-1

Which one is the right relationship when you are at the bottom of a Ferris Wheel ride?

• W = F_c

• Reaction = mg + F_c

• F_c = mg - Reaction

• mg = Reaction

Tags

NGSS.HS-PS2-1

Which of the following force is zero whereby you do not feel any force coming from the seat?

• Normal reaction force
• Weight
• Centripetal Force
• Gravitational Force

A fighter aeroplane flying in the sky dives with a speed of 100 ms^-1 in a vertical circle of radius 200 m. Mass of the pilot sitting in it is 75 kg. What will be the value of force with which the pilot presses his seat when the aeroplane is at highest position (g = 10 ms^-2)

• 3000 N

• 1500 N

• (75 × g)N

• 300 N

Tags

NGSS.HS-PS2-1

A motor cyclist loops a vertical circular loop of diameter 18 m. What should be his minimum speed at the highest point of the loop?

• 9.4 m/s

• 16 m/s

• 21 m/s

• 30 m/s

Tags

NGSS.HS-PS2-1