Question

Which of the following is an example of acceleration?

I. A car speeds up.
II. A car slows down.
III. A car travels in a straight line at a constant speed.
IV. A car travels at a constant speed and turns left.

I and II only
III only
I, II, and IV only
I and IV only

Answer 1

@kittycat123

Answer 2

Which of the following determine an object's velocity?

speed and direction
speed and mass
direction and acceleration
speed, direction, and acceleration

Answer 3

o no the one i just put up

Answer 4

Newton's first law states that an object in motion will stay in motion unless acted upon by an unbalanced force.

If you roll a ball across the floor, you put the ball in motion, but after time, the ball stops. Does this violate Newton's first law?

No, because Newton's laws are really only theories.

No, because the ball is acted upon by the unbalanced force of friction.

Yes, because the unbalanced force of friction should have kept the ball moving.

Yes, because the ball should have continued rolling forever.

Answer 5

i think its B

Answer 6

Which of the following situations demonstrates balanced forces?

a rock thrown upward, being acted on by gravity
a child on a moving seesaw
a clock's pendulum in motion
a car driving on a straight freeway at 60 miles per hour

Answer 7

ok srry im, bakhad to get trash

Answer 8

and c isnt it

Answer 9

it was D

Answer 10

Cheryl has just climbed the steps of the metro bus. She begins walking 10 meters to the back of the bus at a constant speed of 3 miles per hour. At the same time, the bus begins moving forward at a constant speed of 3 miles per hour.

When Cheryl arrives at the back of the bus...

she will have moved 20 meters relative to the Earth.
she will have moved 10 meters relative to the Earth.
she will not have moved relative to the bus.
she will not have moved relative to the Earth.

Answer 11

i think its D

Answer 12

Planets orbit the Sun, while the Moon and other satellites orbit the Earth. Such orbital motion is the result of _______ and each satellite's forward inertia.

fusion
friction
gravity
radiation

Answer 13

i think its gravity

Answer 14

Darrell is trying to remove a nail from a board using the claw of a hammer, but the nail is stuck. Which of the following could Darrell do to make the job easier?

Use a heavier hammer.
Use a hammer with a sharper claw.
Use a hammer with a shorter handle.
Use a hammer with a longer handle.