Centripetal acceleration and centripetal force

A car is making a turn at speed v. The radius of the turn is r and the centripetal force on the car is F.

If the car rounds the same curve at speed 2v, what is the required centripetal force?

• 0.5 F

• F

• 2F

• 4F

Tags

NGSS.HS-PS2-1

The combined mass of a race car and its driver is 600 kg. Travelling at constant speed, the car completes one lap around a circular track of radius 160 m in total time of 36 s. What is the magnitude of the centripetal acceleration of the car?

• 0.17 m s^-2

• 4.9 m s^-2

• 78 m s^-2

• 100 m s^-2

Tags

NGSS.HS-PS2-1

A rock attached to a string swings in a vertical circle. At the highest point,

• no forces act on the rock.

• only one force acts on the rock.

• two forces act on the rock and their resultant is zero.

• two forces act on the rock and their resultant is not zero.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

State what provides the centripetal force for an electron orbits the positive nucleus of an atom.

• Friction between the tyres and the road.

• Attractive electrostatic force acting on the proton due to the electron.

• Electrical force acting on the electron due to the positive nucleus.

• Gravitational force acting on the planet due to the Sun.

Tags

NGSS.HS-PS2-4

An aeroplane is circling in the sky at a speed of 150 m s⁻¹. The aeroplane describes a circle of radius 20 km.

For a passenger of mass 80 kg inside this aeroplane, calculate her centripetal acceleration.

• 0.0075 m s⁻²

• 1.13 m s⁻²

• 7.5 m s⁻²

• 15 m s⁻²

Tags

NGSS.HS-PS2-1

An aeroplane is circling in the sky at a speed of 150 m s⁻¹. The aeroplane describes a circle of radius 20 km.

For a passenger of mass 80 kg inside this aeroplane, calculate the centripetal force acting on her.

• 0.60 N

• 90 N

• 600 N

• 1200 N

Tags

NGSS.HS-PS2-1

The diagram shows a stone tied to the end of a length of string and is whirled round in a horizontal circle . What provides the centripetal force on the stone?

• The weight of the string.

• The friction in the string.

• The tension in the string.

• The air resistance from the surroundings.

Tags

NGSS.HS-PS2-1