Chapter 5 Flashcards

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1
Q

a force that always acts to oppose motion

A

Friction

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2
Q

a push or pull that always acts on an object

A

Force

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3
Q

a change in a moving object’s speed or direction; something is accelerating if it is speeding up, slowing down or changing direction.

A

Acceleration

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4
Q

speed of an object in a particular direction, an objects velocity changes if either its speed or direction changes.

A

Velocity

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5
Q

the force of attraction between objects; it is affected by mass and distance

A

Gravity

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6
Q

the measure of gravitational force exerted on an object

A

Weight

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7
Q

a measure that does not change when an object’s location changes, it is a measure of the amount of matter in an object.

A

Mass

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8
Q

a unit of mass

A

kilogram

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9
Q

SI unit for force

A

Newton

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10
Q

object that appears to stay in place and is used to detect if an object is in motion.

A

Reference point

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11
Q

Calculating net force in same direction:

A

Add

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12
Q

Calculating net force in opposite directions:

A

Subtract and take the direction of the larger force.

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13
Q

Average Speed=
(speed does not have direction)

A

Total distance/(divided by) Total time

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14
Q

How do you calculate the moon’s weight?

A

1/6 of Earth’s gravity
Meaning
120/6= 20

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15
Q

An unbalanced force produces…

A

A change in motion

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16
Q

a unbalanced force can cause a change in…

A

direction, speed, start or stop.

17
Q

Gravitational force is affected by what two factors?

A

Mass & Distance (bigger mass more gravitational pull & the closer the object the greater the gravitational pull)

18
Q

What is the difference between rolling friction and helpful friction

A

Rolling Friction- takes place when an object rolls on the surface
Helpful Friction- Is basically friction that helps us (brakes on a car)

19
Q

Acceleration =

A

Final velocity – Starting Velocity (divided by)
Time it takes to change velocity