Newton's Laws of Motion

A box is initially at rest on a ramp. If the box is subject to balanced forces, the box will

• lift off of the surface of the ramp.

• remain stationary (at rest) on the ramp.

• slide down the ramp.

• slide up the ramp.

What is the unbalanced force that slows down a ball rolling across the floor?

• friction

• gravity

• inertia

• momentum

Tags

NGSS.MS-PS2-2

An airplane is flying at 80 kilometers per hour when a strong tail wind, traveling in the same direction at 5 kilometers per hour, hits the airplane. How can the net force acting on the airplane be calculated?

• add the forces

• subtract the forces

• multiply the forces

• divide the forces

Tags

NGSS.MS-PS2-2

Juanita 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

Joshua and Abigail want to know how much friction a toy truck will experience when it is rolled on different surfaces. They release the toy truck from the top of a ramp and let it roll onto concrete, carpet, wood, and tile. On which surface will the toy truck experience the greatest amount of friction?

• concrete

• carpet

• wood

• tile

Which of the following explains why an apple would fall from a tree?

• the kinetic attraction between the apple and Earth

• the potential attraction between the apple and Earth

• the gravitational attraction between the apple and Earth

• the weak attraction between the apple and Earth

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

According to Newton's second law, which object requires the least amount of force to accelerate?b

• bike

• skateboard

• car

• moving truck

Tags

NGSS.MS-PS2-2

Earth pulls on the Moon and holds the Moon in its orbit. The Moon pulls on Earth with an equal and opposite force. This is an example of which of Newton's Laws?

• Newton's first law

• Newton's second law

• Newton's third law

• Newton's law of inertia

Tags

NGSS.MS-PS2-4

An applied force on a sliding object is 25 N. What frictional force is needed to maintain a constant velocity?

• more than 25 N

• 25 N

• less than 25 N

• zero

Tags

NGSS.MS-PS2-2

A tug-of-war that results in one team pulling the other across the line is an example of which of the following?

• reaction forces, only

• action forces, only

• balanced forces

• unbalanced forces