chapter 2

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The minimum number of forces that act on a book resting on a table is

two

the net force on any object in equilibrium is

zero

Jason weighs 150 N and sits on his big brother's shoulders. Big brother weighs 400 N. The support force supplied by the floor must be

550 N

The support force on a 10-N book at rest on a table is

10-N

A block pulled to the left with 15-N and to the right with 5N at the same time experiences a net force of?

10N

An 800-N man stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is

400N

When a pair of 10-N forces act on a box of candy, the net force on the box is

anything depending on the direction of the forces

If you toss a coin straight upward while in a train moving at constant velocity, the coin will land

as if you were at rest

a hockey puck sliding at constant velocity across the ice is

in equilibrium

Tablecloth trick

inertia

a sheet of paper can be quickly jerked beneath a container of milk without toppling, which best demonstrates

inertia

A force is a vector quantity because

it has both magnitude and direction

which of the following is a vector quantity? (volume;area;mass)

non of them

when no forces act on a moving objects their path are normally

straight lines

The first scientist to introduce the concept of inertia was

Galileo

A package falls off a truck that is moving at 30m/s. neglecting air resistance, the horizontal speed of the package just before it hits the ground is

about 30 m/s

The scientist credited for formulating a model in which the earth circles the sun is

copernicus


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