A group of students is playing tug-of-war. The students on both sides of the rope are pulling with equal force so that the rope is not moving. This is an example of

• unbalanced forces

• balanced forces

• acceleration

• displacement

A firefighter feels the hose pushing backwards onto him as he uses it to put out a fire. What is the most likely cause of this?

• The hose material is very elastic.

• Since the hose is at rest, it tends to stay at rest.

• The force exerted on the water equals the mass of the water times its acceleration.

• The escaping water exerts an equal and opposite force on the hose.

Tags

NGSS.MS-PS2-1

If the same force is applied to each of the balls pictured below, which one will have the LEAST acceleration?

• m = 0.5 kg

• m = 0.75 kg

• m = 1.0 kg

• m = 7.3 kg

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An object in motion with NO UNBALANCED forces acting on it will

• eventually slow down and come to a complete stop.

• slow down, but never quite stop.

• continue to move in its path at a constant speed.

• accelerate.

The upward force on an object falling through the air is ___

• air resistance

• momentum

• inertia

• gravity

The relationship among mass, force, and acceleration is explained by ___

• Law of Conservation of Momentum

• Newton's 2nd Law of Motion

• Newton's 1st Law of Motion

• Newton's 3rd Law of Motion

Tags

NGSS.MS-PS2-2

For any object, the greater the force that's applied to it, the greater its ___ will be.

• acceleration

• inertia

• gravity

• size

Tags

NGSS.MS-PS2-2

The size of the gravitational force between two objects depends on their ___

• frictional forces

• masses and the distance between them

• inertia

• speed and direction

Tags

NGSS.MS-PS2-4

An astronaut is planning a trip to a newly-discovered planet. According to the Law of Universal Gravitation, the astronaut's weight on the new planet will be greater than his weight on Earth if:

• the new planet has less gravity than Earth.

• the new planet has the same gravity as Earth.

• the new planet has more gravity than Earth.

• the gravity of the planet doesn't matter. Weight is the same everywhere in the universe.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

A baseball player swings his bat and misses the ball but hits a fly that was hovering over home plate. The acceleration of the fly compared to what the acceleration of the ball would have been with the same force applied to it would be:

• smaller

• larger

• the same

• not enough information to determine

Tags

NGSS.MS-PS2-1