physics quiz chapter 2

A 1-kg mass at Earth's surface weighs about how many N?

10 N

The gain in speed each second for a freely falling object is about

10 m/s

Disregarding air drag, how fast must you toss a ball straight upward in order for the ball toremain in the air for a total time of 2 s

10 ms/s

If a rocket initially at rest accelerates at a rate of 50 m/s2 for 2, its speed will be

100 m/s

Ten seconds after starting from rest, a freely falling object on Earth will have a speed of about

100 m/s

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

10N

A ball is thrown upward and then falls the same distance back to the Earth. It takes 5 seconds to reach the maximum height. Neglecting air resistance, its total time in the air is about

10s

It takes 5 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft

125 m

If a ball being thrown goes from zero to 30 m/s in 1 s, what is its average acceleration

30 m/s

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributedevenly over both scales. The reading on each scale.

400 N.

An object is pulled northward with a force of 10 N and southward with a force of 15 N. Themagnitude of the net force on the object

5 N

weight of a person on Earth is 500 N. What is the msweight of a person on Earth is 500 N. What is the mass

50 kg

5 second after starting from rest, a freely falling object will have a speed of about

50 m/s

The average speed of a horse that gallops a distance of 10 km in a time of 2h is

5km/h

A ball is thrown upward with a speed of 50 m/s. How many seconds will it take to reach 0m/s at maximum height?

5s

If a car increases its velocity from zero to 60 km/h in 10 s, its acceleration is

6 km/h ∙ s

A car accelerates from rest at 2 m/s2. What is its speed 3 s after the car starts moving

6 m/s

An object is in free fall. At one instant, it travels at a speed of 50 m/s. Exactly 1 s later, its speed is about

60 m/s

The scientist to first introduce the concept of inertia was

Galileo

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

add to equal your weight

Which has zero acceleration

an object at rest, an object moving at constant velocity, an object in mechanical equilibrium

An object in mechanical equilibrium is an object

at rest, moving with constant velocity, or having no acceleration

When a loaf of bread rises, its density

decreases

A ball tossed vertically upward rises, reaches its highest point, and then falls back to itsstarting point. During this time, the acceleration of the ball is always

directed downward

The two measurements necessary for calculating average speed are

distance and time

Hang from a pair of gym rings and the upward support forces of the rings will always

each be half your weight

Aristotle relied on logic in explaining nature, Galileo relied on

experiment

If a freely falling object were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

greater than the second before

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

inertia mass volume

One object has twice as much mass as another object, and also has twice as much what

inertia.

Whenever the net force on an object is zero, its acceleration

is zero

A kilogram is a measure of an object's

mass

Density is the ratio of what?

mass to volume

Where is friction most evident

on a road

weight is

the gravitational attraction between you and the Earth

An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has thegreater mass?

the one on the Moon

Compared with the mass of a certain object on Earth, the mass of the same object on the moon

the same

Which direction does a table push a book resting on

up

As an object freely falls, its

velocity increases

When can an object be in a state of equilibrium

when two or more forces are acting on it and net force is zero

What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10s

zero m/s^2