2nd law Study guide

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

• Unbalanced forces

• Gravitational forces

• Frictional forces

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

• Ball A will have the highest acceleration, and Ball B will have the least.

• Ball B will have the highest acceleration, and Ball A will have the least.

• Ball C will have the highest acceleration, and Ball A will have the least.

• Ball A will have the highest acceleration, and Ball C will have the least.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An object in motion with no unbalanced forces acting on it will _________.

• continue to move at a constant velocity.

• come to a stop.

• accelerate.

• change direction.

The upward force on an object falling through the air is called _________.

• buoyancy

• gravity

• friction

• thrust

Tags

NGSS.MS-PS2-4

The relationship among mass, force, and acceleration is explained by (draw a graph) ____.

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Law of Gravitation

Tags

NGSS.MS-PS2-2

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

• acceleration

• mass

• volume

• density

Tags

NGSS.MS-PS2-2

800 N force is applied to a 50 m/s² object. The mass of the object is ___

• 16 kg

• 20 kg

• 25 kg

• 10 kg

Tags

NGSS.MS-PS2-2

When two forces on the same object are equal and opposite, these forces are called _(balanced /unbalanced) forces.

• balanced

• unbalanced

Tags

NGSS.3-PS2-1

What is the acceleration of the box in the picture?

• 12 m/s²

• 1 m/s²

• 2 m/s²

• 3 m/s²

Tags

NGSS.MS-PS2-2

Consider a watermelon that starts from rest and is dropped straight down from a tall building. Air resistance can be ignored. Which statement about the watermelon’s motion is FALSE?

• The watermelon falls with a constant velocity.

• The watermelon has a positive acceleration.

• After 2 seconds, its velocity is 19.6 m/s.

• The watermelon’s acceleration due to gravity is 9.8 m/s².