IB Final Exam Review Topic 6

The centripetal force that causes a car to go round a bend in the road is provided by

• the force produced by the car engine acting on the wheels.

• the friction between the tyres and the road.

• the weight of the car.

• the force exerted by the driver on the steering wheel.

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The acceleration of free fall of a small sphere of mass 5.0×10⁻³ kg when close to the surface of Jupiter is 25 ms⁻² . The gravitational field strength at the surface of Jupiter is

• 2.0×10⁻⁴ N kg⁻¹

• 1.3×10⁻¹ N kg⁻¹

• 25 N kg⁻¹

• 5.0×10³ N kg⁻¹

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A communications satellite is moving at a constant speed in a circular orbit around Earth. At any given instant in time, the resultant force on the satellite is

• zero.

• equal to the gravitational force on the satellite.

• equal to the vector sum of the gravitational force on the satellite and the centripetal force.

• equal to the force exerted by the satellite’s rockets.

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Many highway entrance and exit roads are circular and designed for cars moving at 50 kmh^-1. To design a similar road for speeds of 100 kmh^-1 the engineers should increase the radius of the circular section by a factor of

• √2

• 2

• 3

• 4

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What is the force due to gravity between two 5000 kg masses that are 0.25 m apart?

• 0.027 N

• 0.106 N

• 0.0067 N

• 0.057 N

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What is the acceleration of a satellite that has an altitude = 3 times the Earth’s radius?

• 3.27 ms^-2

• 1.09 ms^-2

• 2.45 ms^-2

• 0.612 ms^-2

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If an object doubles its velocity, the required centripetal force is multiplied by …

• 2
• 4
• 1/2
• 1/4

What is the speed of a 15 kg mass that completes each rotation of a 25 m diameter circle in 30 seconds?

• 1.34 ms^-1

• 3.19 ms^-1

• 2.62 ms^-1

• 1.76 ms^-1

What is the centripetal force on a 15 kg mass that completes each rotation of a 15 m diameter circle in 20 seconds?

• 8.7 N
• 24.6 N
• 16.6 N
• 11.1 N

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Which of these is least important when designing a friction turn on a new road?

• mass of vehicle
• road surface
• turn radius
• highway speed

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