Physics Forces Flashcard 6

Front

Why is a book resting on a table in equilibrium?

Back

The weight of the book and the table’s upward force on the book are equal in magnitude, but opposite in direction.

Front

A book that is resting on a shelf 1.5 m above the floor has a weight of 12 N. The force the shelf exerts upon the book must be:

Back

12 N

Front

While closing a door of mass 10 kg, a student pushes on it with a force of 25 N. As the door is accelerating to close, what force does the door exert on the student?

Back

25 N

Front

When will a chair exert a force of 50 N on a man pushing it with a force of 50 N?

Back

When the chair is at rest or in motion.

Front

A man standing on a chair weighs 800 N. In order for the chair to support the man, the chair must exert an upward force of:

Back

800 N.

Front

A student is holding a book that has a weight of 20 N in his hand while sitting in a chair. A man claims that the book must be attracting Earth with a force of 20 N. His claim must be:

Back

true because of force pair interactions.

Front

Diagram of a 5-kg mass resting on a table: Which correctly represents the force of the table on the mass?

Back

Diagram a)

Front

While a rubber ball is in the air and moving up after bouncing, is it exerting any forces?

Back

Yes, the ball is pulling on the earth with a gravitational force.

Front

A ball is rolled along and off a table. What acts on the ball after it leaves the table but before it hits the floor?

Back

Only the force of the earth’s gravity on the ball.

Front

A spring scale reads 20 Newtons as it pulls a 5.0-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?

Back

20 N