Final Exam

During a science class, Kevin and Tyara wondered what keeps us from floating into space. What is the reason?

• gravity

• rocks

• Moon

Answer explanation

Gravity is the force that pulls objects toward each other, keeping us anchored to the Earth. Without gravity, we would float into space. Rocks and the Moon do not prevent us from floating; it's gravity that holds us down.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

What does gravity do to the ball when Kevin throws it up?

• push

• stop

• pull

Answer explanation

Gravity is a force that pulls objects toward each other. It is responsible for keeping us on the ground and causing objects to fall. Therefore, the correct answer is 'pull'.

Tags

NGSS.3-PS2-1

NGSS.5-PS2-1

Kevin and Tyara are discussing what Earth's gravity is like. What is it similar to?

• diamond

• magnet

• brick

Answer explanation

Earth's gravity is often compared to a magnet because it pulls objects towards its center, similar to how a magnet attracts metal. This gravitational force keeps everything anchored to the planet.

Tags

NGSS.MS-PS2-4

During a science class, Tyara asked, "What has the gravity to pull all planets?"

• snow

• Earth

• Sun

Answer explanation

The Sun has a strong gravitational pull due to its massive size, which keeps all planets, including Earth, in orbit around it. Snow does not have any gravitational influence on planets.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Kevin and Angel are playing outside when it starts to rain. What is an example of gravity?

• rainfall

• umbrella

• dark clouds

Answer explanation

Rainfall is an example of gravity in action, as it occurs when water droplets fall to the ground due to gravitational pull. The other options, like umbrella and dark clouds, do not directly illustrate the concept of gravity.

Tags

NGSS.5-PS2-1

What are the bowling balls that Kevin and Jacob placed on the rack doing?

• rolling

• bouncing

• resting

Answer explanation

The bowling balls on the rack are not in motion; they are stationary. Therefore, the correct answer is that they are resting, as they are placed on the rack and not rolling or bouncing.

How can Tyara make the bowling ball start moving?

• move it

• leave it alone

• sing to it

Answer explanation

To make the ball stop resting, Lu needs to physically change its position. Moving it is the only action that will directly affect its state, while leaving it alone or singing to it will not cause any change.

Tags

NGSS.3-PS2-1

What does Kevin do to the bowling ball?

• kick

• roll

• wash

Answer explanation

Lu rolls the bowling ball, which is the correct action in bowling. Kicking or washing the ball are not typical actions associated with bowling.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

During a bowling game, what causes the pins to move?

• birds

• water

• moving ball

Answer explanation

The bowling pins move when struck by the moving ball. The force from the ball transfers to the pins, causing them to topple. Birds and water do not play a role in this scenario.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Kevin and Jacob are playing with a bowling ball. Which law explains why the bowling ball keeps rolling until it hits the pins?

• The First Law of Motion

• The First Law of Fashion

• The First Law of Traffic

Answer explanation

The First Law of Motion, also known as Newton's First Law, states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by a force. This principle applies to the dynamics of bowling.

Tags

NGSS.MS-PS3-5