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Prov '23 > Physics 3 > Flashcards

Physics 3 Flashcards

1
Q

What is the main idea of Newton’s 1st Law of Motion?

A

Objects in Motion stay in motion, an object at rest stay at rest

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2
Q

Give 3 examples of Newton’s 1st Law in Action

A

Ball rolling down a hill, Throwing a ball in a moving car, trying to pull something heavy

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3
Q

What term best illustrates this law?

A

Inertia

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4
Q

Name 4 men who contributed to this idea

A

Aristotle, Galileo, Copernicus, Newton

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5
Q

What term is the best measure of inertia?

A

Mass

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6
Q

What units are the standard for mass?

A

Kg

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7
Q

What is the difference between mass and weight?

A

Weight is the force of gravity upon an object and Mass is how many molecules (how much stuff) is in an object.

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8
Q

Convert 72 kilograms to weight in pounds (1 kg= 2.2 lbs).

A

158.4lbs

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9
Q

What is the formula for converting mass into weight?

A

W = m x g

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10
Q

Convert 50 kg into weight

A

490N

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11
Q

What is the standard unit for weight in Physics?

A

N

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12
Q

What term describes when net force on an object equals zero?

A

Equilibrium

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13
Q

What happens to the force or tension on ropes when 2 ropes hold the weight

A

50% of the weight is placed in each

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14
Q

What happens to an object that falls from a tree?

A

The tree falls from it and gravity pulls it to the ground, when hitting the ground, the ground hits it back.

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15
Q

How does the earths spin affect something falling from a tree?

A

It will continue to spin with the earth even while falling

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16
Q

What happens to a ball tossed in the air vertically?

A

It will fall back at their feet

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17
Q

What happens to that ball when the person is in a car?

A

It will still fall at their feet as long as they maintain a constant speed

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18
Q

If forces of 15 and 25 N act on an object in opposite directions, what is the result?

A

It will move in the direction of the 25N push but only with 15N of force

19
Q

If forces of 20 and 30 N act on an object in the same direction, what is the result?

A

50N of force in the same direction

20
Q

How much mass is in an object that weights 30 N?

A

3.06Kg

21
Q

What is the main formula that explains Newton’s 2nd Law of Motion?

A

F= mass x acceleration

22
Q

What is the relationship between mass and acceleration?

A

Inversely proportional

23
Q

What is the relationship between force and acceleration?

A

Directly proportional

24
Q

What term describes the force that acts opposite any object in motion?

A

Friction

25
Q

What is the equation for pressure?

A

Pressure = Force / Acceleration

26
Q

What units are used for pressure?

A

Pascals (Pa)

27
Q

27How much pressure is found when 15 N of force acts on 3 square meters?

A

P=15/3 P=5Pa

28
Q

How much pressure is found when 15N acts on 10 square meters?

A

P=15/10 P=1.5Pa

29
Q

When a cannon ball falls to the earth…what objects move?

A

The earth, the canon, the ball

30
Q

What is the acceleration of the cannonball as it falls?

A

The same as when it was launched

31
Q

If the cannonball weighs 5 kg, how much force is found when it falls?

A

F=ma F=5(9.8) F=49

32
Q

How can a skydiver increase his/her acceleration?

A

If he stretches his legs/arms out he will slowdown and if he brings everything in to the center (like a pencil) then he will speed up)

33
Q

If a racquetball full of quarters was dropped from a 3 story building, and a regular tennis ball was dropped at the same time, which would hit the earth first? Why?

A

They would hit at the same time because the heavier ball didn’t have time to accelerate faster than the normal one.

34
Q

If a barbell with a mass of 12 kg was pushed with a force of 50 N, how fast would it accelerate?

A

f=ma 50N=12a a=4.16 m/s

35
Q

If a car with a mass of 2200 kg was accelerating at 8 m/s2, how much force is produced?

A

f=ma f=2200x8 f=17,600

36
Q

What term best describes a force?
Push, Pull, or Interaction

A

Interaction

37
Q

What phrase best describes Newton’s 3rd Law of Motion?

A

To every action there is an opposite and equal reaction

38
Q

If a dog is happy and wagging his tail (action), what is the reaction?

A

The tail wags the dog

39
Q

When a kicker strikes a soccer ball with 15 N, how hard does the soccer ball strike back?

A

15N

40
Q

When a person runs to the end of a dock and pushes down with both legs, why does the person leave the dock and fall in to the lake?

A

Because the dock pushes back

41
Q

When a balloon filled with air (not tied) is released, why does it accelerate away?

A

Because the air comes out and pushes on the balloon

42
Q

When a man kicks a soccer ball with 25 N of force, and another man kicks the same ball in the opposite direction with 25 N of force, what result will occur?

A

No movement

43
Q

What words best describe the interaction of friction with an object?

A

Force in the opposite direction

44
Q

When a mass of 15 kg falls to earth, at what force of air resistance will it reach its terminal velocity?

A

ar=w 15(N?)

Prov '23 (26 decks)

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