Transcript Forces & Motion Questions

Forces & Motion
Questions
Reviewing the Unit
Which of the following has the most
momentum?
a) A 20-kilogram ball at rest
b)A 5-kilogram ball rolling at 4 meters per
second
c) A 10-kilogram ball rolling at 2 meters per
second
d)A 10-kilogram rolling at 4 meters per second
Cindy is at the park. She throws a paper airplane
northward. There is a strong wind blowing from
West to East. What will most likely happen?
a) The paper airplane will turn southward.
b) The paper airplane will turn westward.
c) The paper airplane will turn eastward.
d) The paper airplane will not turn.
The amount of momentum an object has
depends on its _________.
a) mass and velocity
b)shape and velocity
c) mass and weight
d)size and shape
On a highway, a tractor trailer must keep a long distance
from the vehicle it is following. A small car traveling at
the same speed does not have to keep such a long
distance from the vehicle it is following. Why is this
true?
a) The tractor trailer has less mass than the car, thus it is
easier to stop.
b) The tractor trailer has more mass than the car, thus it is
harder to stop.
c) The tractor trailer has less momentum than the car, thus
it is harder to stop
d) The tractor trailer has less mass than the car, thus it is
harder to stop.
The tendency of a resting object to stay at rest
and a moving object to stay in motion is
called:
a) inertia
b)force
c) acceleration
d)gravity
Jane complains to her dad that she seems to move
slower down her playground slide than she did
several weeks ago. Her dad applies some car wax to
the metal surface of the slide and Jane can now
move faster down the slide. How can you best
explain this observation?
a) The wax increased the force of friction on the slide.
b) The wax decreased the force of friction on the slide.
c) The wax decreased the force of gravity on the slide.
d) The wax increased the force of gravity on the slide.
Gary balanced his pencil on the back of his chair.
Which of the following is true?
a) The pencil must fall off the chair eventually,
due to gravity.
b)If no outside force is applied to the pencil or
the chair, then the pencil will fall down.
c) If the pencil falls off the chair, this means an
outside force was applied.
d)The pencil must be magnetically attracted to
the chair.
Jim wants to measure the speed of a ball rolling
down a wooden board for his science project.
However, the ball rolls too fast for him to
measure precisely. Which of the following
procedures would have he greatest effect in
slowing down the ball so that Jim can measure
the speed better?
a) decreasing the slope of the board
b)raising the slope of the board
c) putting wax on the board’s surface
d)sanding the surface of the board
Which of the following will go faster?
a) a ball rolling down a hill at a 60-degree angle
b)a ball sitting on ground level
c) a ball rolling down a hill at a 30-degree angle
d)a ball falling from a building the same heigh
as the hill
You construct hills of the same slope from
several materials and slide a brick down each
of them. Upon which one will the brick slide
slowest?
a) a hill made of glass
b)a hill made of waxed metal
c) a hill made of concrete
d)a hill made of waxed wood