Force/Newton's Laws Physics

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

• balanced forces

• displacement

• acceleration

• unbalanced forces

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

• 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.

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

• Bowling ball with mass of 7.3 kg

• Golf ball with mass of 0.5 kg

• Tennis ball with mass of 0.75 kg

• Baseball with mass of 1.0 kg

Which of the following is measured in Newtons?

• mass

• momentum

• acceleration

• force

The upward force on an object falling through the air is

• air resistance

• gravity

• inertia

• momentum

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

• Newton's 3rd Law of Motion

• Law of Conservation of Momentum

• Newton's 1st Law of Motion

• Newton's 2nd 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.

• inertia

• gravity

• size

• acceleration

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

• inertia

• speed and direction

• frictional forces

• masses and the distance between them

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

• the new planet has less gravity than Earth.

• the new planet has more gravity than Earth.

• the new planet has the same gravity as Earth.

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

• Newton's 3rd Law of Motion

• Newton's 2nd Law of Motion

• Newton's 1st Law of Motion

• Law of Conservation of Momentum