HP.U5.Q2

The velocity is always _____ to the line of a circle.

• outwards

• tangent

• towards the centre

• faster

An object which move in uniform circular motion must move with?

• constant speed

• constant direction

• constant velocity

Which of the following depicts the direction of the velocity of the blowing ball in a circular motion?

• A

• C

• B

• D

What is the direction of the acceleration at point A, if the ball is revolving clockwise?

• up

• right

• down

• left

A 0.50 kilogram object moves in a horizontal circular path with a radius of 0.25 meter at a constant speed of 4.0 meters per second. What is the magnitude of the object’s acceleration?

• 8 m/s²

• 32 m/s²

• 16 m/s²

• 64 m/s²

A 2 x 10³ kilogram car travels at a constant speed of 12 meters per second around a circular curve of radius 30 meters. What is the magnitude of the centripetal acceleration of the car as it goes around the curve?

• 0.4 m/s²

• 800 m/s²

• 4.8 m/s²

• 9600 m/s²

If the velocity of a car traveling around a circular track doubles, its centripetal acceleration would be

• 1/2 as great

• 1/4 as great

• 2 times greater

• 4 times greater

An unbalanced force of 40 Newtons keeps a 5 kilogram object traveling in a circle of radius 2 meters. What is the speed of the object?

• 8 m/s

• 16 m/s

• 2 m/s

• 4 m/s

A car travels at a constant speed in a uniform circle. If the radius of the path is halved while maintaining the same speed, what happens to the centripetal acceleration

• Halved

• Doubled

• Quadrupled

• Remains the same

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