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Physical Science > Chapter 10 > Flashcards

Chapter 10 Flashcards

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0
Q

An example of constant acceleration is

A

Uniform circular motion

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1
Q

What is the speed of a object at rest?

A

0 km/h

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2
Q

The combination of all of the forces acting on an object is called the

A

Net force

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3
Q

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?

A

The object is experiencing some kind of friction

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4
Q

When velocity changes by the same amount over each time interval, acceleration is

A

Constant

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5
Q

In order to determine speed, you must know

A

Both time and distance

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6
Q

The distance traveled by an object divided by the time it takes to travel that distance is called

A

Average speed

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7
Q

Which straight-line acceleration indicates an increase in speed?

A

4 m/s2

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8
Q

If the net force acting on a stationary object is zero, then the object will

A

Remain at rest

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9
Q

When the velocity of an object changes, it is acted upon by an

A

Force

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10
Q

The SI unit for acceleration is

A

m/s2

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11
Q

Acceleration can mean

A

All of these

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12
Q

What does it mean when a change in velocity is negative?

A

The object is slowing down

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13
Q

When an object changes position relative to a reference point, the object is

A

In motion

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14
Q

The friction between the air and the surface of a moving object is

A

Fluid friction

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15
Q

Acceleration is defined as the change in velocity divided by

A

Time

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16
Q

How can the friction on a water slide be reduced?

A

Run a constant stream of water down the slide

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17
Q

Which of the following statements is true?

A

Frictional forces are greatest when both surfaces are rough

18
Q

Average speed can be represented by the mathematical expression

A

Distance/ time

19
Q

Friction is defined as

A

Force that opposes motion between two surfaces that are touching

20
Q

Which of the following speeds is the most accurate?

A

100 miles per second

21
Q

Which is an example of harmful friction?

A

Engine parts wearing down

22
Q

Which of these is constant during uniform circular motion?

A

Speed

23
Q

Displacement

A

All of these

24
Q

Which is not a way to reduce friction

A

Set a paperweight on notebook paper

25
Q

A tug-of-war that results in one team pulling the other across the line is an example of

A

In balanced forces

26
Q

Which is an example of balanced forces acting on an object?

A

A leaf lying on the grass

27
Q

Centripetal acceleration occurs because an object is

A

Changing direction

28
Q

Which of the following situations best demonstrates the effects of friction?

A

A parachute descending to the ground

29
Q

Which of the following is a displacement?

A

3 miles north

30
Q

If the net force on an object is zero then the object has

A

Balanced forces

31
Q

Displacement must always indicate

A

Direction

32
Q

Which of the following does not indicate velocity?

A

28 km from Los Angeles to Catalina island

33
Q

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?

A

17.5 m/s south

34
Q

Which of the following best illustrates balanced forces?

A

A stretched rubber band being held between two hands

35
Q

In order to increase a cars speed, the force pushing it forward must be

A

Greater than the force of friction

36
Q

An object experiencing balanced forces

A

Has a net force of zero

37
Q

The______ of an object consists of it’s speed and direction

A

Velocity

38
Q

Which is an example of static friction?

A

Pushing a box that is at rest

39
Q

Force is a quantity made up of

A

Magnitude and direction

40
Q

The difference between speed and velocity is that velocity includes

A

Direction

41
Q

Net force is

A

The combination of all forces acting on an object

42
Q

Which is an example of kinetic friction?

A

Friction between a cars windshield and the air as you drive into the wind

Physical Science (6 decks)

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