Understanding Circular Motion

What happens to an object moving in a circle if the centripetal force is removed?

• It continues moving in a circle.

• It moves in a straight line.

• It comes to a stop.

• It moves in a zigzag pattern.

In the ball and hoop demonstration, what is the role of the hoop?

• To change the mass of the ball.

• To exert a contact force at right angles to the ball's surface.

• To provide a gravitational force.

• To increase the speed of the ball.

According to Newton's first law, what is true about an object moving at a steady speed in a straight line?

• It is decelerating.

• It is accelerating.

• The resultant force on it is zero.

• The force on it is increasing.

What is the direction of the force that keeps an object moving in a circle?

• Opposite to the object's velocity.

• Parallel to the object's velocity.

• Towards the center of the circle.

• Away from the center of the circle.

What safety precautions are recommended for the sparkler demonstration?

• Hold the sparkler with bare hands.

• Use a plastic drill.

• Stand directly in front of the sparkler.

• Wear goggles and a lab coat.