Question

1. choose the best answer.

an object in motion tends to resist a change in motion due to ______.
○ inertia
○ friction
○ acceleration
○ gravity

1. choose the best answer.

what creates radio waves and light waves?
○ magnetic and electric waves travel perpendicular to each other in radiation.
○ gravitational forces bend electrical energy.
○ frictional forces ignite chemicals that then send out energy as waves.
○ friction created by the acceleration of electrical energy creates high frequency sound waves.

Explanation:

• Question 16: According to Newton's first law of motion, inertia is the property of an object that causes it to resist changes in its state of motion. Friction opposes relative motion between surfaces in contact. Acceleration is the rate of change of velocity. Gravity is a force of attraction between objects. So, an object in motion resists a change in motion due to inertia.
• Question 17: Radio waves and light waves are electromagnetic waves. Electromagnetic waves are created when magnetic and electric waves travel perpendicular to each other in radiation. Gravitational forces are related to the mass of objects and do not create radio or light waves. Frictional forces and the acceleration of electrical energy do not create radio and light waves in the way described in the other options.

Answer:

1. inertia
2. Magnetic and electric waves travel perpendicular to each other in radiation.