Newton's Laws and Forces Final Recap

If you were in a spaceship and fired a cannonball into frictionless space, the amount of force needed to keep the cannonball in motion would be ____.

• zero, since no force is necessary to keep an object moving

• equal to the force with which it was fired

• more than the force with which it was fired

• less than the force with which it was fired

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

An object is moving along a level surface with a constant velocity.  The net force acting upon the object is _____.

• in the direction of motion

• opposite the direction of motion

• zero

• ... none of these can be determined without further information.

Tags

NGSS.HS-PS2-1

A rightward moving object is coasting to a stop along a straight, level surface.  The net force acting upon the object MUST be ____.

• directed rightward

• directed leftward

• zero

• ... impossible to answer without further information.

Tags

NGSS.HS-PS2-1

Analyze the free body diagram and determine which of the following statements is true of this rightward-moving object?

• This object weighs 1000 N.

• The object has a mass of 100 kg.

• The acceleration is leftward.

• The acceleration is rightward.

Tags

NGSS.HS-PS2-1

A free-falling object is an object ____.

• which has reached a terminal velocity.

•   upon which the force of air resistance is equal to the force of gravity

• upon which gravity is the only force

• None of these appropriately complete this sentence.

A quiet moment during a test is interrupted as a physics book falls from a table and strikes the floor.  The reaction force to the force of the floor pushing upwards on the book (when it hits the ground) is ____.

• the force of the Earth pulling the book downwards

• the force of the book upon itself

• the force of the floor pushing down on the Earth

• the force of the book pushing down on the floor

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A large truck rear-ends a less massive car at a stop sign.  The force of the truck on the car is _____ the force of the car on the truck.

• greater than

• less than

• equal to

Tags

NGSS.HS-PS2-1

A box is being accelerated across a level surface.  A force is being applied to the box in an upward and rightward direction (as shown below).  In this situation, the normal force is ____ the force of gravity.

• greater than

• less than

• equal to

Tags

NGSS.HS-PS2-1

A box is being accelerated across a level surface.  A force is being applied to the box in an upward and a rightward direction (as shown below).  This force makes an angle of 30 degrees with the horizontal. If the angle at which the force is exerted is increased to 45 degrees, then the normal force would ____.

• increase.

• decrease.

• stay the same.

Tags

NGSS.HS-PS2-1

A box is being accelerated across a level surface.  A force is being applied to the box in an upward and a rightward direction (as shown below).  This force makes an angle of 30 degrees with the horizontal. If the angle at which the force is exerted is increased to 45 degrees, then the friction force would ____.

• increase.

• decrease.

• stay the same.