Circular M. & U Gravitation

Which statement is true about an object that is traveling in uniform circular motion?

• The speed of the object varies.
• The net force on the object is directed toward the center of the circular path.
• The direction of the object's velocity is constant.
• The net force on the object is directed away from the center of the circular path.

Why does an object experiencing uniform circular motion have an acceleration?

• because it ir changing speed

• because it is changing direction

• because it is moving n a straight line

• because it has mass

What is the angular speed of the hour hand in a clock?

• (π/12) rad h⁻¹

• (π/24) rad h⁻¹

• (2π/12) rad h⁻¹

• (2π/60) rad h⁻¹

What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

• 5 m/s²

• 17.63 m/s²

• 10 m/s²

• 8.81 m/s²

The Earth has a radius of 6400 km and rotate once every 24 hours. Calculate the centripetal acceleration of a body on the equator of the Earth.

• 9.81 m s^-2

• 0.034 m s^-2

• 0.34 m s^-2

• 4.4 × 10⁵ m s^-2

Which of the following depict the speed of the blowing ball?

• A
• B
• C
• D

What object experiences uniform circular motion?

• A car speeding up as it turns left
• A car traveling around a roundabout at a constant speed
• A car slowing down as it crests a tall hill
• A car traveling down the road at a constant speed

• 1
• 2
• 3
• 4

Which represents the acceleration of the ball?

• A
• B
• C
• D

An object is moving with uniform speed in a counterclockwise, horizontal circle. Which of the following images correctly depicts the force vector and velocity vector at a point in time.

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