physics test for senior four

What is the force that keeps an object moving in a circular path called?

• Centripetal force

• Inertial force

• Centrifugal force

• Tangential force

How does the centripetal force direction compare to the direction of the object's motion?

• Opposite

• Parallel

• Perpendicular

• Diagonal

Define angular velocity in the context of circular motion.

• Angular velocity is the rate of change of angular displacement with respect to time.

• Angular velocity is the force acting on an object in circular motion.

• Angular velocity is the distance traveled by an object in circular motion.

• Angular velocity is the speed of an object in circular motion.

What is the formula for calculating tangential acceleration in circular motion?

• a_t = r / α

• a_t = r + α

• a_t = r * α

• a_t = r^2 * α

Explain the relationship between tangential acceleration and angular acceleration.

• Angular acceleration is not related to tangential acceleration.

• Tangential acceleration is inversely proportional to angular acceleration.

• Tangential acceleration is equal to the square of the angular acceleration.

• Tangential acceleration is equal to the radius of rotation multiplied by the angular acceleration.

How is the period of rotation related to the frequency of rotation?

• Inverse relationship

• No relationship

• Direct relationship

• Exponential relationship

Calculate the centripetal force required to keep a 2 kg object moving in a circle of radius 3 meters at a speed of 4 m/s.

• 5.67 N

• 12.34 N

• 2.5 N

• 10.67 N

If the angular velocity of an object is 2 rad/s and the radius of the circle is 5 meters, what is the linear speed of the object?

• 10 m/s

• 5 m/s

• 20 m/s

• 15 m/s

A car is moving in a circular path with a radius of 10 meters. If the car's speed is increasing at a rate of 2 m/s^2, what is the tangential acceleration?

• 5 m/s^2

• 3 m/s^2

• 2 m/s^2

• 1 m/s^2

If a Ferris wheel takes 2 minutes to complete one full rotation, what is the period of rotation in seconds?

• 120

• 30

• 90

• 180