Newton's Laws of Motion and Free Body Diagrams

Which statement best explains Newton's Third Law of Motion?

• An object at rest tends to stay at rest.

• For every action there is an equal and opposite reaction.

• The acceleration of an object is based on the force applied.

• An object continues its motion until an unbalanced force is applied.

Tags

NGSS.MS-PS2-1

As the wheels of a train push down on the track, the track pushes back against the wheels. Which of Newton's laws is used to explain these forces.

• An object at rest tends to stay at rest unless acted upon by an unbalanced force.

• The net force of an object is its mass times its acceleration.

• For every action, there is an equal and opposite reaction.

• Any 2 objects exert a gravitational force of attraction on each other.

Tags

NGSS.MS-PS2-1

A student throws a ball against a wall.  Which statement best explains what is happening in the picture.

• The energy of the ball is destroyed as it strikes the wall.

• The energy of the ball becomes negative as it hits the wall.

• The force from the wall on the ball is equal and opposite to the force from the ball on the wall.

• The force exerted by the ball on the wall is greater than the force exerted by the wall on the ball.

Tags

NGSS.MS-PS2-1

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.

• Every mass exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

Tags

NGSS.MS-PS2-1

A representation of the magnitude and direction of all forces acting on an object is…

• Free Body Diagram

• Vector Quantities

• Net Force

• Inertia

Label a free body diagram f book sitting on a desk

a

b

F grav

F app

F air

F norm

Tags

NGSS.MS-PS2-4

Draw a free body diagram for a car moving at a constant velocity on a straight road. Which forces should be included?

• Only gravitational force

• Gravitational force and normal force

• Gravitational force, normal force, and frictional force

• Gravitational force, normal force, frictional force, and applied force

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DOK Level 2: Skill/Concept

Use this Free Body Diagram to answer the question: This is a Free Body Diagram of a laptop on a table being pushed to the right with acceleration. Name the force that is colored GREEN:

• Friction

• Natural

• Applied

• Gravitational

Tags

NGSS.MS-PS2-2

Use this Free Body Diagram to answer the question: This is a Free Body Diagram of a laptop on a table being pushed to the right with acceleration. Name the force that is colored GREEN:

• Friction

• Natural

• Applied

• Gravitational

Tags

NGSS.MS-PS2-2

Label a free body diagram for a a person pushing a crate to the right across the floor

c

e

b

d

F air

F app

F norm

F tens

F frict

F grav

Tags

NGSS.MS-PS2-2