exam1

Place a book that weighs 10 N on a horizontal surface and the support force on the book is

10 N

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

10 N

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

10 m/s

the gain is speed each second for a freely falling object is about

10 m/s

when a falling object gains 10 m/s each second, its acceleration is

10 m/s/s

a 1-kg mass at earth's surface weighs about

10N

Fido weighs 120 N and carries Trixie who weighs 40 N on her back. The support force on Fido's feet is

160 N

You're driving in a car at 50 km/h and bump into a car ahead traveling at 48 km/h in the same direction. The speed of impact is

2 km/hr

a 3000 N bear grasping a verticle tree slides down at constant velocity the friction between the tree and the bear is

3000 N

If a Jaguar sports car accelerates from zero to 100 km/h in 3.0 s its acceleration is

33.3 km/h/s

the average speed of a deer traveling a distance of 2 km in a time of one- half hour is

4 km/hr

If a ball rolls down an inclined plane and picks up 4 m/s each second it rolls, its acceleration is

4 m/s/s

Burl and paul have a total weight of 1300 N the tensions in the ropes that support the scaffold they stand on adds to 1700 N the weight of the scaffold itself must be

400 N

in a dream you're in a car traveling 50 km/hr and bump into another car traveling toward you at 48 km/h the speed of impact is

98 km/h

which has the greatest mass?

automobile battery

when sign painter burl and paul stand on opposite ends of a scaffold, the tensions in each of the two supporting ropes

depend on the relative weights of burl and paul

A kilogram is a measure of an object's

mass

your weight is

the gravitational attraction between you and the earth

a 50 N object falling in air experiences 50 N of air resistance. the amount of net force on the falling object is

0 N

An object travels 8 m in the 1st second of travel, 8 m again during the 2nd second of travel, and 8 m again during the 3rd second. Its acceleration is

0 m/s

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

0 m/s/s

a 50 N object falling in air experiences 30 N of air resistance. the amount of net force on the falling object is

20 N

the average speed of a horse that gallops a distance of 10 km in a time of 30 min is

20 km/h

While in an airplane flying at 100 km/h you look down from the window and spot another airplane flying at the same speed in the opposite direction. Relative to you, the speed of the spotted plane is

200 km/h

a man weighing 800 N stands at rest on two bathroom scales so that one scale sows a reading of 500 N the reading on the other scale is

300 N

a man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales the reading on each scale is

400 N

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

5 m/s

nelie runs the length of a 100 yard football field in a time of 20 sec her average running speed is

5 yards/s

a girl pushes a cart to the left with a 100-N force. a boy pushes it to the right with a 50-N force.

50 N to the left

A free-falling object has a speed of 30 m/s at one instant. Exactly one second later its speed will be

50 m/s

When a 10 N object is suspended at rest by two vertical strands of rope. the tension in each rope is

5N

an object is pulled with two forces. 10 N northward and 15 N southward. the magnitude of the new force is

5N

When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west with 15 N, the combination of these forces on the block is

5N east

An object in free fall has a speed of 60 m/s. One second later its speed is

70 m/s

the scientist to first introduce the concept of inertia was

Galileo

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

Mass, volume, inertia

when you stand at rest on a pair of bathroom scales the reading on the scales will always

add to equal your weight

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

add up to equal your weight

you're lying on the sand on a breezy day when a pesky fly wishes to join you the breeze is blowing at a steady 2 m/s in order for the fly to land on you it should hover over you while flying

against the breeze at 2 m/s

an object is mechanical equilibrium is an object

all of the above

if a non- rotating object has no acceleration the we can say for certain that it is

all of the above

which has zero acceleration?

all of the above

if burl carried paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would

be equal

while a crate rests on a horizontal floor the friction force acting on the crate is

between zero and the weight of the crate

Aristotle treated motion by

classifying it into two classes.

a tutor will be correct in saying that velocity and acceleration are

different concept

the two measurements necessary for calculating average sped are

distance and time

a parachutist falling at constant velocity is in a state of

dynamic equilibrium

a bucket of cement is raised by a rope at constant speed at a construction site. the upward force on the bucket supplied by the rope is

equal to the force of gravity

According to Galileo, the test of scientific truth is

experiment

In contrast to Aristotle's way of explaining nature, Galileo relied on

experiment

science greatly advanced when Galileo favored

experiment

A motor scooter undergoes acceleration when it

gains speed, decreases speed, and changes direction

the resistive force of friction occurs for

gases, liquids, solids

the amount of friction that occurs when two blocks slide against each other depends on

how much they are pressed together and the stickiness of atoms on their surfaces

when a crate slides down an incline at a constant velocity it is in a state of

in dynamic equilibrium

During each second of free fall, the speed of an object

increases by the same amount

An object that has twice as much mass as another object also has twice as much

inertia

a glance at your speedometer will tell you your

instantaneous speed

When a ball increases in speed by the same amount each second, its acceleration

is constant

the acceleration of a cart moving down an inclined plane

is constant

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

is zero

when Galileo rolled a ball down an incline and up another incline, he found that the ball rolled nearly to

its initial height

Galileo said that if you rolled a ball along a level surface it would

keep rolling without slowing down if no friction acted upon it

Aristotle believed that natural laws could be understood by

logic

you would have the largest mass of gold if it weighed 1 N on th

moon

At the end of 2 seconds of free fall, an apple falling from rest has a speed of

more than 10 m/s

and object is pulled with three forces one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. the net force is

none of the above

at the end of two seconds of free fall, an object released from rest will have a speed of

none of the above

compared with a 1-kg block of solid iron , a 2-kg block of solid iron has the same

none of the above

the equilibrium rule F= 0 applies to

objects or systems in uniform motion in a straight line and at rest

Acoording to Galileo, inertia is a

property of all matter

Galileo's demonstration at the leaning tower of pisa

refuted Aristotle's teachings

An object is pulled with two forces 10 N northward and 15 N southward. the magnitude of the new force is

south

when you push your desk to the right, friction on the desk acts toward

the left

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass?

the moon

what did Galileo incorporate in his study of motion that Aristotle overlooked?

the role of time

compared with the mass of a certain object on earth, the mass of the same object o the moon is

the same

when you push a crate across the level floor at constant speed, friction between the crate and the floor is

the same amount as your pushing force

when she hikes a distance of 1 km in a time of one-half hour her average speed is

twice 1 km/hr

when you stand at rest on a floor, the number of vertical forces acting on you is

two

As an object freely falls, its

velocity increases

If you toss a ball straight upward at 40 m/s with no air resistance, 6 seconds later its speed is

zero

If you toss a ball straight upward at 40 m/s with no air resistance, one second before it reaches the top of its path its speed is

zero

if you toss a ball straight upward at 40 m/s with no air resistance, one second after it reaches the top of its path its speed is

zero

the speed of a vertically- thrown ball at the top of its path is

zero