Physics - Circular Motion

Calculate the mass of an object if it took 20 N of force to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s

• 4.1 kg
• 3.6 kg
• 2.5 kg
• 1.8 kg

Tags

NGSS.HS-PS2-1

Why do objects experience centripetal acceleration?

• Because they are speeding up as they move in a circle
• Because they are constantly changing direction and the net change is directed inward
• Because they are constantly changing both speed and direction
• Because when you have 100 people pedaling, you can speed up more easily.

At the instant shown in the diagram, the car's centripetal acceleration is directed-

• toward E

• toward N

• toward W

• clockwise

Tags

NGSS.HS-PS2-1

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

• outwards
• towards the center
• tangent
• faster

If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)

• 9.4 m/s
• 6.8 m/s
• 11.7 m/s
• 3.5 m/s

If a ball is swinging at the end of a rope and the rope is suddenly cut, assuming there is no gravity, what best describes the path it will take?

• It will fly in a straight line forward from where it was cut

• It will fly in a curved line away from the circle

• It will fly inward toward the circle

• 

Tags

NGSS.HS-PS2-1

A toy train moves in a circular track with a velocity of 2.2 m/s, the axis of rotation is 1.8 m. What is its centripetal acceleration?

• 1.22 m/s²

• 0.81 m/s²

• 2.69 m/s²

• 1.47 m/s²

What is the tangential velocity if the centripetal force is 150 N when a 3 kg toy plane flies in a 2 m radius circle?

• 10 m/s

• 100 m/s

• 225 m/s

• 15 m/s

Tags

NGSS.HS-PS2-1

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

A bicycle has a period of 0.3s . What is the

speed of its tires if their radius is 30 cm?

• 6 m/s

• 3 m/s

• 60 m/s

• 30 m/s