The Action or Process of Moving or Being Moved

A student pushes a block across a wood table. Which statement best describes why the block will eventually stop?

• An object at rest will remain at rest

• The force of friction impedes (prevents) motion

• For every action there is an equal and opposite reaction

• If no outside force is applied to a moving object, it will keep moving.

Tags

NGSS.MS-PS2-2

A ball is motionless on the floor. Which best explains this?

• No friction is acting on the ball

• The inertia on the ball is too low

• The friction on the ball is too high

• No unbalanced force is being applied to the ball

Which example best illustrates Isaac Newton's third law of motion, which describes action and reaction forces?

• A rocket takes off from the ground

• A book slides forward on a seat when the car stops

• A heavier ball falls at the same speed as a lighter ball

• A vehicle rounds a curve and changes its acceleration

Tags

NGSS.MS-PS2-1

A bug hits the windshield of a moving car. Which statement describes the forces?

• The force on the car is equal to the force on the bug

• The force on the car is greater than the force on the bug

• The force on the bug is greater than the force on the car

• The force on the bug and the force on the car remain zero.

Tags

NGSS.MS-PS2-1

Which of the following changes when an unbalanced force acts on an object?

• mass

• inertia

• motion

• weight

Tags

NGSS.MS-PS2-2

A student kicks a ball and the ball rolls forward. Which statement best explains why this happens?

• The force of gravity pulls down on the ball

• The force of friction is greater than the force of gravity

• The force of the kick is greater than the force of the friction on the ball.

• The force of the ball is greater than the force of the kick, so the ball moves.

Tags

NGSS.MS-PS2-2

Two people are pulling on a rope in opposite directions. Neither person is moving the other. Which must be true?

• The are using no force

• They are forcing the rope to bend

• They are using the same amount of force

• One person is using more force

Tags

NGSS.MS-PS2-2

Which is a correct statement about forces?

• All forces act in pairs

• All forces are balanced

• A pulling force is required to move an object

• A pushing force is required to move an object

Tags

NGSS.MS-PS2-1

Which best explains how unbalanced forces acting in opposite directions will affect the motion of an object at rest?

• The object will move in the direction of the lesser force

• The object will move in the direction of the greater force

• The unbalanced forces will cause the object to remain at rest

• The unbalanced forces will cause the object to move at ever-changing speeds

Tags

NGSS.3-PS2-1

The force that prevents a ball rolling on the ground from continuing on its path forever is:

• inertia

• momentum

• friction

• kinetic energy