5470 Forces in Equilibrium

Which shows the free body diagram of a concert-goer sitting on a hill, enjoying the show?

• (1)

• (2)

• (3)

• (4)

• (5)

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

An 850-kg astronaut in a spacesuit is training on Earth. On the moon, the same astronaut will have

• the same weight but less mass

• the same mass and less weight

• the same weight and the same mass

• less mass and less weight

Tags

NGSS.HS-PS2-4

The law of inertia states that an object

• will continue moving at the same speed unless an unbalanced force acts on it.

• will continue moving in a straight line unless an unbalanced force acts on it.

• at rest will remain at rest unless an unbalanced force acts on it.

• will do all of the above.

Terminal velocity is achieved when a skydiver is in dynamic equilibrium. What must be the free body diagram?

• 
• 
• 

Tags

NGSS.HS-PS2-1

A tumblebuggy pulls horizontally on a book, but the book is not moving. Which of the following statements is true?

• The tension force is equal to teh weight of the book.

• The tension force is less than the force of friction.

• The tension force is greater than the force of friction.

• The tension force is equal to the force of friction.

Tags

NGSS.HS-PS2-1

A tumblebuggy pulls horizontally on a book, but the book now moves at constant velocity. Which of the following statements is true?

• The tension force is equal to teh weight of the book.

• The tension force is less than the force of friction.

• The tension force is greater than the force of friction.

• The tension force is equal to the force of friction.

Tags

NGSS.HS-PS2-1

Sophia is being pulled at a constant velocity to the right. Her net force

• is zero

• is positive

• is negative

• is dependent on the force with which she is pulled

Tags

NGSS.HS-PS2-1

An air hockey puck with negligible friction glides across the floor, making a dot diagram above. If friction continues to be negligible, the puck will

• slow to a stop

• continue at constant velocity in a straight line

• speed up

• begin at constant speed but slow to a stop eventually

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

An air hockey puck with negligible friction glides across the floor, making a dot diagram above. The net force acting on the puck is

• zero because there are no forces in the x-direction

• zero because applied force cancels friction

• positive because it slides to the right

• negative because friction is unbalanced

Tags

NGSS.HS-PS2-1

Which point(s) on the position v. time graph indicate dynamic equilibrium?

• A

• B

• C

• none of the above