force, gravity, electric charge, magnestism

A box of books is on the floor. The following picture shows a push and a pull acting on the box. What is the net force toward the right on the box?

• 0 N

• 50 N

• 100 N

• 2,500 N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Jessica is comparing two different balls. One ball has a mass of 1 kg. The other ball has a mass of 2 kg. She pushes each with a force of 100 N. How does the acceleration of the two balls compare?

• The 1-kg ball accelerates the same as the 2-kg ball.

• The 1-kg ball accelerates half as much as the 2-kg ball.

• The 1-kg ball accelerates twice as much as the 2-kg ball.

• The 1-kg ball accelerates four times as much as the 2-kg ball.

Tags

NGSS.MS-PS2-2

During a baseball game, a hitter strikes the ball with a bat. When this happens, the ball and the bat exert a force on each other. Why does the ball accelerate away from the bat more than the bat accelerates away from the ball?

• The ball has less mass, so it exerts less force on the bat.

• The ball has greater velocity before the collision, so the force affects the ball more than it affects the bat.

• The bat exerts more force than the ball because the batter is exerting a force on the bat as it hits the ball.

• The ball has less mass, so the equal force on the ball and the bat causes greater acceleration of the ball.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

All charged objects create an electric field around them. What two factors determine the strength of two electric fields upon the charged objects creating them?

• how charged the object creating the field is and the mass of the two charged objects

• how charged the object creating the field is and the distance between the two charged objects

• how charged the object creating the field is and whether the objects are positively or negatively charged

• how charged the object creating the field is and the density of the two charged objects

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

High and low tides are the regular pattern of rising and sinking ocean-water levels. They are formed as a result of the gravitational forces of the moon and sun on Earth’s oceans. The moon has a greater effect on Earth’s oceans than the sun. Why would the moon have a greater effect than the sun?

• The moon is not as hot as the sun.

• The moon has less mass than Earth.

• The moon has less mass than the sun.

• The moon is closer to Earth than the sun is.

Tags

NGSS.MS-ESS1-1

What is required for a space shuttle to leave Earth?

• A small amount of thrust

• A great amount of thrust

• No thrust at all

• Only gravity

Once in space, how much fuel does a shuttle need to keep circling Earth?

• A lot of fuel

• No fuel at all

• Very little fuel

• The same as on Earth

Tags

NGSS.MS-PS2-4

Which of the following best describes "orbit"?

• The force that pulls objects together

• The path an object takes as it circles another object

• The resistance to motion

• The amount of matter in an object

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Why does a space shuttle need less fuel once it is in orbit?

• There is no gravity in space

• It is moving in a straight line

• It is already moving and needs little force to keep going

• It is lighter in space

Which of the following best explains why two 10 kg masses have a greater gravitational force between them than two 5 kg masses?

• They are closer together

• They have more mass

• They are lighter

• They are farther apart

Tags

NGSS.MS-PS2-4