Unit 5 Lesson 3 (Review)

Danni folds a paper airplane and attaches a paper clip to the front of it. After she throws the plane, it travels about 30 feet and then starts to fall to the ground. Why does the plane eventually fall to the ground?

• The force of air resistance stops acting on the plane.

• The molecular force of the ground begins acting on the plane.

• The force of gravity is greater than the forces keeping the plane in the air.

• The paper clip creates a magnetic force that attracts the plane to the ground.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A Peyton tries to push a bookshelf across a room. She applies as much force as possible, but she cannot make the bookshelf move. Which statement BEST describes why the bookshelf does not move?

• The student does not apply enough force to the bookshelf, so the forces are unbalanced.

• The student does not apply enough force to the bookshelf, so the forces are still balanced.

• 
  The student applies too much force to the bookshelf, and now the forces on the bookshelf are balanced.

• The student applies too much force to the bookshelf, and now the forces on the bookshelf are unbalanced.

Tags

NGSS.MS-PS2-2

What forces are needed to balance the box?

• 5N left and 10N down

• 5N right and 10N up

• 10N left and 5N down

• 10N right and 5N up

Tags

NGSS.MS-PS2-2

15 children weigh the same are playing a game of tug-of-war. 5 children pull with 5 newtons of force, while ten children pull with 10 newtons of force in the opposite direction. How can one determine the net force on the rope?

• The forces are in opposite directions, so the newtons can be divided.

• 
  The forces are in opposite directions, so the newtons can be subtracted.

• The newtons are in the same direction, so the newtons can be multiplied.

• The forces are in the same direction, so the newtons can be added.

Tags

NGSS.MS-PS2-2

Two forces act on an object. One force has a magnitude of 10 N directed north, and the other force has a magnitude of 2 N directed south. The net force on the object is

• 8N south

• 25N North

• 
  12N south.

• 8N North

Tags

NGSS.MS-PS2-2

Lino made a list about balanced and unbalanced forces. What mistake did he make?

• Lino forgot to add that forces can never change.

• Unbalanced forces only cause objects to stay in the same place.

• 
  Lino switched the descriptions for unbalanced and balanced forces.

• Balanced forces only cause objects to change directions.

Tags

NGSS.3-PS2-1

A projectile is launched into space where there is very little friction. According to Newton's law of inertia, the projectile will most likely continue to travel in a straight line and

• eventually slow to a stop.

• gradually decrease and then increase in speed.

• increase in speed and then slow to a stop.

• remain at a constant speed.

When is it clear that balanced forces are acting on an object?

• The object begins moving.

• The object stops moving.

• The object's motion does not change.

• The object's motion changes direction.

Ricky is riding the school bus. The bus stops as the driver applies the brakes. Which of these best describes this situation?

• 
  The bus is gaining energy because of friction.

• The school bus does not lose or gain kinetic energy.

• There is no force acting on the bus, so it stops moving.

• A force is changing the motion of the bus.

Tags

NGSS.MS-PS2-2

How is the space shuttle able to leave Earth's surface?

• The space shuttle's engines create an upward force less than the downward force of gravity.

• The space shuttle's engines create a downward force less than the upward force of gravity

• 
  The space shuttle's engines create a downward force greater than the upward force of gravity.

• The space shuttle's engines create an upward force greater than the downward force of gravity.

Tags

NGSS.MS-PS2-2