Forces Gravity and Motion

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

• 50

• 100

• 2500

Tags

NGSS.MS-PS2-2

Which of the following is considered a contact force?

• the force between two magnets

• the gravitational pull of a planet

• friction between an object and air

• the force between two charged particles

Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of the following conclusions is true?

• Only object A will accelerate.

• Only object B will accelerate.

• Both object A and object B will accelerate.

• Neither object A nor object B will accelerate.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Jessica has two 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

What is the gravitational force acting on an object that has a mass of 10.0 kg?

• 0.2 kg·m/s ²

• 9.8 kg·m/s ²

• 10.0 kg·m/s ²

• 98.0 kg·m/s ²

Tags

NGSS.MS-PS2-4

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

NGSS.MS-PS2-4

What is gravity?

• the force that pushes all objects toward Earth

• the force that pulls all objects toward one another

• a magnetic force that is strongest at Earth’s poles

• a stream of charged particles from the sun to Earth

Tags

NGSS.MS-PS2-4

The objects shown in the following diagrams have different masses and are different distances apart. Which diagram shows the two objects that have the greatest gravitational force between them?

• 
• 
• 
• 

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NGSS.MS-PS2-4

In order for a space shuttle to leave Earth, it must produce a great amount of thrust. Its rocket boosters create this thrusting force by burning great amounts of fuel. However, once in space, the shuttle needs very little fuel. It circles Earth while gravity pulls it toward Earth. What term describes the motion of the shuttle around Earth?

• orbit

• gravity

• inertia

• weight

Tags

NGSS.MS-ESS1-2