Chapter 10 Review
Which is an example of balanced forces acting on an object?
a leaf lying on the grass
What situation best demonstrates the effects of friction?
a parachutist descending to the ground
Which of the following best illustrates balanced forces?
a stretched rubber band being held between two hands
The distance traveled by an object divided by the time it takes to travel that distance is called
average speed.
If the net force on an object is zero then the object has
balanced forces.
In order to determine speed, you must know
both time and distance.
On a distance-time graph, distance is usually the ______ variable.
dependent, Y
Friction is defined as
force that opposes motion between two surfaces that are touching
What does the slope of an object accelerating uniformly (at a constant rate) look like on an acceleration vs. time graph? Hint: Draw these to see what they look like.
straight and sloping up to the right
Compared with the acceleration of object B, the acceleration of object A is about
twice as great
A tug-of-war that results in one team pulling the other across the line is an example of
unbalanced forces.
Which of the following is not caused by a net force?
keeping a bicycle going in a straight line at constant speed.
Which of the following are important in measuring motion?
Distance, time, speed
Speed that does not change is called average speed. True or False
False
The distance-time graph for acceleration is always a straight line. True or False
False
When the velocity of an object changes, it is acted upon by a(n)
Force
The object or point from which movement is determined is called:
Frame of reference
Which is an example of kinetic friction?
Friction between a car's windshield and the air as you drive into the wind.
What statement is true?
Frictional forces are greatest when both surfaces are rough.
What is the speed of an object at rest?
0 km/h
Find the speed of any object that covers 400 km in 5 hr.
80 km/hr
Motion is:
A change in position relative to a frame of reference
Deceleration is:
Negative acceleration
The distance traveled by an object per unit time is called:
Speed
An object is in motion when
The object changes position relative to a stationery reference point.
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?
The object is experiencing some kind of friction.