Dynamics

The change in size and composition in a population over time.

• density

• dynamic

• death rate

Tags

NGSS.MS-LS2-4

The number of individuals in the population.

• population size

• density

• dispersion

Review the graph provided. What statements can be made about the significant decline in moose in the mid 1990's?

• The moose decline was a direct result of wolf decline.

• The is no way to know why the moose population dropped.

• The drop is most likely due to the declining wolf population, but more information would be needed to determine that.

• The drop is most likely due to the increasing wolf population, but more information would be needed to determine that.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following must be true if an object is accelerating?

• It is going really fast.

• It is moving away from the frame of reference point.

• Balanced forces are acting upon it.

• Unbalanced forces are acting upon it.

Tags

NGSS.MS-PS2-2

A student drops a ball onto the floor and it bounces. Which of the following statements about the interaction between the ball and the floor is correct?

• The floor applies the same amount of force to the ball that the ball applies to the floor, which causes the ball to bounce.

• The floor applies a larger amount of force to the ball than the ball applies to the floor, which causes the ball to bounce.

• The floor applies a larger amount of force to the ball than the ball applies to the floor because it is a part of the Earth.

• The ball applies a larger amount of force to the floor than the floor applies to the ball because the ball bounces.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The force diagram for an object that is being dragged across the floor is shown to the right. The object is experiencing an acceleration of 2 m/s² as it moves under the influence of the forces shown. Use the diagram to determine the force of friction acting on the object.

• The force of friction is 30 newtons.

• The force of friction is 50 newtons.

• The force of friction is 20 newtons.

• The force of friction is 150 newtons.

Tags

NGSS.MS-PS2-2

After breaking up, Jane slapped John with a force of 15 N. But John did not slap back because he knows that he exerted the same amount of force on Jane. What concept supported the idea of John?

• Law of Inertia

• Law of Acceleration

• Law of Action-Reaction

• Law of Gravitation

• Conservation of Energy

Tags

NGSS.MS-PS2-1

A 60.0-kg sprinter starts a race with an acceleration of 5 m/s². What is the net external force on him?

• 30 N

• 300 N

• 18 N

• 180 N

Tags

NGSS.MS-PS2-2

A 20N of force was applied to a 10 kg box. What is its acceleration?

• 2 m/s²

• 200 m/s²

• 10 m/s²

• 0.2 m/s²

• 0.5 m/s²

Tags

NGSS.MS-PS2-2

Which of the following is a fundamental concept of dynamics?

• Inertia

• Momentum

• Force

• Energy

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4