When the mass of an object is compared to its voume, the concept is:

A. mass

B. weight

C. volume

D. density

The mass of 1 kilogram of iron

A. is less on the moon

B. is the same on the moon

C. is greater on the moon

D. weighs the sam everywhere

Toss a ball straight upward, and each second on the way to the top it

A. loses 10 m/s in speed

B. accelerates upward

C. both of the above

D. neither of the above

If you drop a boulder from a tall cliff, as it falls it will gain

A. 10 m/s of speed each second

B. more and more speed each second

C. equal amount of falling distance each second

D. all of the above

After being dropped from the top of a high building, a free-falling object has a speed of 30 m/s at one instant. Exactly 1 second earlier, its speed was:

A. the same

B. 10 m/s

C. 20 m/s

D. 40 m/s

A body undergoes acceleration whenever there is a change in its

A. speed

B. velocity

C. direction

D. all of the above

When a ball rolling down an inclined plane gains 4 m/s, the acceleration of the ball is

A. 0

B. 4 m/s

C. 4 m/s²

D. none of the above

When a bird flies at 8 km/h in an 8 km/h headwind (moving against the wind), teh speed of the bird relative to the ground is

A. zero

B. 8 km/h

C. 16 km/h

D. more than 16 km/h

Constant speed in a constant direction is

A. constant velocity

B. acceleration

C. both of the above

D. neither of the above

The kind of speed you read on a speedometer is

A. average speed

B. instantaneous speed

C. changing speed

D. constant

The force of friction between materials sliding against each other depends on

A. the kind of materials

B. the roughness of the materials

C. the force with which they are pressed together

D. all of the above

The difference between speed and velocity mostly involves

A. amount

B. direction

C. acceleration

D. all of the above

The net force on any object in equilibrium is

A. zero

B. 10 m/s²

C. equal to its weight

D. non of the above

If gravity between the sun and Earth suddenly vanished, Earth would move in

A. a curved path

B. a straight-line path

C. an outward spiral path

D. an inward spiral

Seat belts and air bags ina  car are mostly linked to teh effects of Newton's

A. first law

B. second law

C. third law

D. law of gravity

When a 10kg block is simultaneously pushed eastward with 20 N and westward with 15 N, the net force on the block is

A. 35 N west

B. 35 N east

C. 5 N west

D. 5 N east

When you toss a rock straight upward, which is no longer present at the top of its path?

A. mass

B. speed

C. acceleration

D. all of the above

Earth pulls on the Moon. Similarly teh Moon pulls on the Earth, evidence that

A. Earth and Moon are pulling on each other

B. Earth's and Moon's pulls comprise an action-reaction pair of forces

C. Both of the above occur

D. None of the above occur

An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration

A. quadruples

B. doubles

C. stays the same

D. halves

A karate chop delivers a blow of 3500 N to a board that breaks. The force that acts on the hand during this event is

A. less than 3500 N

B. 3500 N

C. greater than 3500 N

D. None of teh above

The force that propels a rocket is provided by

A. gravity

B. its exhaust gases

C. Newton's laws of motion

D. The atmosphere against which the rocket pushes

Arnold Strongman and little Nellie Newton have a tug-of-war. The greates force on the rope is provided by

A. Arnold, of course

B. Nellie, surprisingly

C. Both the same, interestingly enough

D. None of the above

Whic of the following has the largest momentum relative to Earth?

A. a tightrope walker crossing Niagara Falls

B. a pickup truck speeding along the highway

C. a Mack truck parked in a parking lot

D. the Science building on campus

Whereas impulse involves force and time, work involves force and

A. energy

B. acceleration

C. power

D. distance

The running speed of Fast Freddy doubles; what else doubles?

A. his kinetic energy

B. his momentum

C. both of these

D. neither of these

It is correct to say that impulse is equal to

A. momentum

B. the change in momentum

C. the force multiplied by the distance the force acts

D. all of these

Raising an auto on a service station rack requires work. Raising it twice as high requires

If an object has kinetic energy, it must also have

A. potential energy

B. momentum

C. power

D. impulse

A connonball shot from a cannon with a long barrel will emerge with greater speed, because the cannonball receives a greater

A. average force

B. impulse

C. both of the above

D. neither of the above

A moving object has

A. momentum

B. energy

C. speed

D. all of the above

If you push for an hour against a stationary wall, you do no work

A. on the wall

B. at all

C. both of these

D. none of these

When an object is lifted 10 m, it gains a certain amount of potential energy. If the same object is lifted 20 m, its potential energy gain is

A. less

B. the same

C. twice as much

D. four times as much

C. twice as much

A machine can multiply forces or

A. distances

B. work

C. energy

D. all of the above

A certain machine is 30% efficient. This means the machine will convert

A. 70% of the energy input into useful work - 30% will be wasted

B. 30% of the energy input into useful work - 70% will be wasted

C. As strange as it may seem, both of the above

D. None of the above

It takes 40 J to push a large box 4 m across a floor. Assuming the push is in the same direction as teh move, what is the magnitude of the force on the box?

A. 4 N

B. 10 N

C. 40 N

D. 160 N

The force of gravity between two planets depends on their

A. masses and distance apart

B. planetary atmospheres

C. rotational motions

D. all of the above

I the mass of one planet is somehow doubled, the force of gravity between it and a neighboring planet would

A. double

B. quadruple

C. reduce by half

D. reduce by one quarter

A. double

If the distance between two planets decreases to half, the force of gravity between them

A. doubles

B. quadruples

C. decreases to half

D. decreases to one quarter

If you weigh yourself in an elevator, you'll weigh more when the elevator

A. moves upward

B. moves downward

C. accelerates upward

D. all of the above

The velocity of a typical projectile can be represented by horizontal and vertical components. Assuming negligible air resistance, the horizontal componenet along the path of the projectile

A. increases

B. decreases

C. remains the same

D. not enough information

You are weightless when you are

A. in freefall

B. without support force

C. infinitely away from all mass

D. all of the above

If the sun were twice as massive, its pull on the EArth would be

A. unchanged

B. twice as much

C. half as much

D. four times as much

When you stand at rest on a weighing scale, the force due to gravity on you is

A. equal in magnitude to the support force of the scale

B. almost equal to the support force of the scale

C. actually absent

D. none of the above

A ball tossed at an angle of 20 degrees with the horizontal will go as far downrange as one tossed at the same speed at an angle of

A. 45 degrees

B. 70 degrees

C. 90 degrees

D. none of the above

When you toss a projectile sideways, it curves as it falls. it will be an Earth satellite if the curve it makes

A. matches the curved surface fo the Earth

B. results in a straight line

C. spirals out indefinitely

D. none of the above

When a satellite travels at constant speed, the shape of its path is

A. circle

B. an ellipse

C. an oval that is almost elliptical

D. a circle witha square corner, as seen throughout your book

The speed of a satellite in an elliptical orbit

A. varies

B. remains constant

C. arcs at right angles to its motion

D. all of the above

A satellite in elliptical orbit about the Earth travels fastest when it moves

A. close to Earth

B. far from Earth

C. in either direction - the same everywhere

D. between the near and far points from Earth