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.

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

Which of the following is measured in Newtons?

• weight

• momentum

• mass

• acceleration

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 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

According to Newton’s laws, for any object, the greater the force that's applied to it, the greater its ____ will be.

• acceleration

• inertia

• gravity

• size

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

• frictional forces

• inertia

• masses and the distance between them

• speed and direction

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.

"To every action there is an equal and opposite reaction" describes which law?

• Law of Conservation of Momentum

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion