4) If a person is riding a bike and want to slow down, they use the brakes. This is an example of which of the following?
A: Frame of reference
B: Motion
C: Deceleration
D: Velocity

5) Which of the following may be causing trouble for a person moving a chair across the room?
A: Friction
B: Velocity
C: Motion
D: Speed

6) The boy sat in the car so long it felt like he was no longer moving, but then he saw a tree that was beginning to get further and
further away from his view. The tree is which of the following?
A: Friction
B: Frame of reference
C: Velocity
D: Gravity

How will the emission of an alpha particle affect the atomic number of an atom

What three natural resources are found in the great lakes region

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.