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16. Which of the following is true about centripetal force? (1 Point) * 0 it always acts away from the center of the circle. Q It is not necessary for circular motion. Q It is the net force that keeps an object moving in a circle. Q It is the force of gravity acting on an object. 17. Which of the following is true about the period of a pendulum? (1 Point) * Q It is the time taken for one complete swing. O lt is equal to the length of the pendulum. 0 it is affected by the mass of the pendulum bob. Q It is independent of the acceleration due to gravity. 20. Which of the following is true about the Doppler effect? (1 Point) * Q It only occurs with sound waves. 0 it causes a change in frequency but not wavelength. 0 it is the change in pitch of a sound as a source moves relative to an observer. Q It does not occur with light waves. 21. Which of the following is an example of rotational motion? (1 Point) * O A car moving in a straight line C) Aball rolling down a hill 0 A planet orbiting the sun 0 A person walking on a treadmill 6. Which of the following is a scalar quantity? (1 Point) * 0 Velocity O Acceleration 7. Which of the following equations is used to calculate average velocity? (1 Point) * S O \"are Y 5;: :1\" (K II SXI 52;: E || Er |- 8. Which of the following is true about instantaneous velocity? (1 Point) * 0 it is the same as average velocity. 0 it can never be zero. 0 it is the velocity at a particular instant in time. Q it is always negative. 9. What is the acceleration of an object that is moving with constant velocity? (1 Point) * 0 None of the above 14. The range of a projectile depends on which of the following factors? (1 Point) * 0 Initial velocity and time of flight O Acceleration and mass 0 Height and weight 0 Temperature and pressure 15. Which of the following is an example of circular motion? (1 Point) * O A car moving in a straight line 0 A ball bouncing off a wall 0 A planet orbiting the sun 0 A person walking on a treadmill 22. Which of the following is true about angular velocity? (1 Point) * Q It is a scalar quantity. Q It is measured in meters per second. 0 it is the rate at which an object rotates. Q It does not depend on the shape or size of an object. 23. What is the relationship between linear velocity and angular velocity for a rotating object? (1 Point) * 0 They are directly proportional. 0 They are inversely proportional. 0 They have no relationship. 0 it depends on the radius of the object. 12. Which of the following equations is used to calculate the displacement of an object with constant acceleration? (1 Point) * 13. Which of the following is an example of projectile motion? (1 Point) * O A car moving on a straight road 0 A ball rolling down a hill 0 A rocket launching into space 0 A pendulum swinging back and forth 18. Which of the following is an example of harmonic motion? (1 Point) * O A car accelerating from rest 0 A ball bouncing on the ground 0 A spring oscillating back and forth 0 A person running on a track 19. What is the relationship between the period and frequency of a wave? (1 Point) * 0 They are inversely proportional. 0 They are directly proportional. 0 They have no relationship. 0 it depends on the type of wave. 4. Which of the following is the branch of physics that deals with the motion of objects without considering the forces causing the motion? (1 Point) * O Kinematics 0 Dynamics 0 Thermodynamics O Electromagnetism 5. Which of the following quantities is a vector quantity? (1 Point) * 0 Displacement 0 Time 10. Which of the following is the correct equation to calculate acceleration? (1 Point) * O a = 's-vi O a = v, x vi x t O a = vs + vi-t Oa = ! 11. What does the area under a velocity-time graph represent? (1 Point) * O Distance traveled O Displacement Acceleration O Force