1) In uniform circular motion, the centripetal force: a) Acts outward from the center b) Acts tangentially to the path c) Acts inward toward the center d) Acts vertically upward 2) A 2 kg object moves at 4 m/s in a circle of radius 2 m. What is the centripetal force? a) 8 b) 12 c) 16 d) 20 3) The so-called "centrifugal force" experienced in a rotating frame is: a) A real force acting toward the center b) A fictitious force perceived in a rotating frame c) Caused by gravity d) Always equal to the centripetal force plus gravity 4) If the speed of a car moving in a circular track is doubled, the required centripetal force will: a) Stay the same b) Double c) Increase four times d) Decrease to one-fourth 5) For a constant speed, increasing the radius of circular motion will: a) Increase the centripetal force b) Decrease the centripetal force c) Not affect the centripetal force d) Reverse the centripetal force direction 6) A body moving in a circle at constant speed changes direction because: a) A tangential force increases its speed b) A perpendicular (centripetal) force continuously changes velocity direction c) Gravity is acting upward d) The centrifugal force pushes it inward 7) When a car turns on a frictionless banked curve, the centripetal force is provided by: a) Friction between tires and road b) The vertical component of normal force c) The horizontal component of normal force d) Centrifugal force 8) If the string of a whirling stone is suddenly cut, the stone will: a) Fly radially outward b) Fall straight down c) Move in a straight line tangential to the circle d) Spiral outward slowly 9) The centripetal force keeping Earth in orbit around the Sun is provided by: a) Centrifugal force b) Gravitational attraction c) Earth's rotation d) Sunlight pressure 10) In a spinning amusement ride, passengers feel as if they are pushed outward because: a) Centrifugal force is pushing them outward b) Centripetal force is pushing them outward c) Their inertia resists the change in direction d) Gravity is weaker inside the ride

Circular Motion

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