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.