Chapter 10 Flashcards
An example of constant acceleration is
Uniform circular motion
What is the speed of a object at rest?
0 km/h
The combination of all of the forces acting on an object is called the
Net force
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
When velocity changes by the same amount over each time interval, acceleration is
Constant
In order to determine speed, you must know
Both time and distance
The distance traveled by an object divided by the time it takes to travel that distance is called
Average speed
Which straight-line acceleration indicates an increase in speed?
4 m/s2
If the net force acting on a stationary object is zero, then the object will
Remain at rest
When the velocity of an object changes, it is acted upon by an
Force
The SI unit for acceleration is
m/s2
Acceleration can mean
All of these
What does it mean when a change in velocity is negative?
The object is slowing down
When an object changes position relative to a reference point, the object is
In motion
The friction between the air and the surface of a moving object is
Fluid friction
Acceleration is defined as the change in velocity divided by
Time
How can the friction on a water slide be reduced?
Run a constant stream of water down the slide
Which of the following statements is true?
Frictional forces are greatest when both surfaces are rough
Average speed can be represented by the mathematical expression
Distance/ time
Friction is defined as
Force that opposes motion between two surfaces that are touching
Which of the following speeds is the most accurate?
100 miles per second
Which is an example of harmful friction?
Engine parts wearing down
Which of these is constant during uniform circular motion?
Speed
Displacement
All of these
Which is not a way to reduce friction
Set a paperweight on notebook paper
A tug-of-war that results in one team pulling the other across the line is an example of
In balanced forces
Which is an example of balanced forces acting on an object?
A leaf lying on the grass
Centripetal acceleration occurs because an object is
Changing direction
Which of the following situations best demonstrates the effects of friction?
A parachute descending to the ground
Which of the following is a displacement?
3 miles north
If the net force on an object is zero then the object has
Balanced forces
Displacement must always indicate
Direction
Which of the following does not indicate velocity?
28 km from Los Angeles to Catalina island
On a bus traveling south at 15.0 m/s, a child walks south at 2.5 m/sec. What is the child’s resultant velocity?
17.5 m/s south
Which of the following best illustrates balanced forces?
A stretched rubber band being held between two hands
In order to increase a cars speed, the force pushing it forward must be
Greater than the force of friction
An object experiencing balanced forces
Has a net force of zero
The______ of an object consists of it’s speed and direction
Velocity
Which is an example of static friction?
Pushing a box that is at rest
Force is a quantity made up of
Magnitude and direction
The difference between speed and velocity is that velocity includes
Direction
Net force is
The combination of all forces acting on an object
Which is an example of kinetic friction?
Friction between a cars windshield and the air as you drive into the wind
