Newton's Laws of Motion and Free Body Diagrams

Based on the free-body diagram, which statement is true?

• The object is moving to the left

• The object is accelerating to the right

• The object is accelerating to the left

• The object is moving to the right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Block of cheese, B, has a mass of 0.5 kg and the wheel of cheese, W, has a mass of 0.4 kg. What is the tension in rope 1? Assume the acceleration is 0 m/s²

• 4.91 N

• 8.83 N

• 3.92 N

• 0.981 N

Tags

NGSS.MS-PS2-2

Based on this free-body diagram, which statement can you be sure is true?

• This object is not moving

• This object is moving to the right

• This object is accelerating to the left

• This object is accelerating to the right

Tags

NGSS.HS-PS2-1

When determining the NET force on an object you should (TWO correct answers)

• subtract forces in opposite directions

• add forces in the same direction

• divide by velocity

• multiply by acceleration

Tags

NGSS.MS-PS2-2

What is Newton's Second Law

• F = -kx

• F = ma

• F = mg

• F = mad

The tendency of an object to resist changes in its motion is...

• inertia

• force

• acceleration

• velocity

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The combination of all the forces acting on an object is the...

• net force

• action force

• reaction force

• balance force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

While you are driving, a kid runs into the street. If your car has a mass of 900 kg and there's a net braking force of 2700 N, what is the acceleration?

• 3 m/s²

• 1800 m/s²

• 12 m/s²

• 900 m/s²

Tags

NGSS.MS-PS2-2

Drag the scenario to the correct Newton's Law.

Groups:

(a) Newton's 1st Law

,

(b) Newton's 2nd Law

,

(c) Newton's 3rd Law

• A fireman turns on his hose and is knocked backwards.

• If air lets out of a balloon quickly, it pushes down and the balloon moves up.

• It takes less force to move a ping pong ball than a bowling ball.

• A soccer ball will not move until a player kicks it.

• A ball rolling down hill continues to roll until friction makes it slow to a stop.

• F = ma

Tags

NGSS.MS-PS2-1

Consider the four free body diagrams. Free-body diagrams are used to show the magnitude and direction of all forces acting on an object in a given situation. Do any of the free body diagrams indicate motion? If yes, which one(s).

• No. In all four free body diagrams the forces are balanced.

• Yes. In B the book is slowing down because of the friction force opposing motion.

• Yes. In D the two forces are unbalanced. The upward force is greater than the force of gravity so the object moves upward.

• Yes. In B and D. In both cases, forces are unbalanced. In B, there is a net force to the left; in D there is a net force upward.

Tags

NGSS.MS-PS2-2