Physics 3

Question 1

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

Answer 1

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

Question 2

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

Answer 2

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

Question 3

What term best illustrates this law?

Answer 3

Inertia

Question 4

Name 4 men who contributed to this idea

Answer 4

Aristotle, Galileo, Copernicus, Newton

Question 5

What term is the best measure of inertia?

Answer 5

Mass

Question 6

What units are the standard for mass?

Answer 6

Kg

Question 7

What is the difference between mass and weight?

Answer 7

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

Question 8

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

Answer 8

158.4lbs

Question 9

What is the formula for converting mass into weight?

Answer 9

W = m x g

Question 10

Convert 50 kg into weight

Answer 10

490N

Question 11

What is the standard unit for weight in Physics?

Answer 11

N

Question 12

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

Answer 12

Equilibrium

Question 13

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

Answer 13

50% of the weight is placed in each

Question 14

What happens to an object that falls from a tree?

Answer 14

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

Question 15

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

Answer 15

It will continue to spin with the earth even while falling

Question 16

What happens to a ball tossed in the air vertically?

Answer 16

It will fall back at their feet

Question 17

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

Answer 17

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

Question 18

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

Answer 18

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

Question 19

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

Answer 19

50N of force in the same direction

Question 20

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

Answer 20

3.06Kg

Question 21

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

Answer 21

F= mass x acceleration

Question 22

What is the relationship between mass and acceleration?

Answer 22

Inversely proportional

Question 23

What is the relationship between force and acceleration?

Answer 23

Directly proportional

Question 24

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

Answer 24

Friction

Question 25

What is the equation for pressure?

Answer 25

Pressure = Force / Acceleration

Question 26

What units are used for pressure?

Answer 26

Pascals (Pa)

Question 27

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

Answer 27

P=15/3 P=5Pa

Question 28

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

Answer 28

P=15/10 P=1.5Pa

Question 29

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

Answer 29

The earth, the canon, the ball

Question 30

What is the acceleration of the cannonball as it falls?

Answer 30

The same as when it was launched

Question 31

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

Answer 31

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

Question 32

How can a skydiver increase his/her acceleration?

Answer 32

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)

Question 33

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?

Answer 33

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

Question 34

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

Answer 34

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

Question 35

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

Answer 35

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

Question 36

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

Answer 36

Interaction

Question 37

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

Answer 37

To every action there is an opposite and equal reaction

Question 38

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

Answer 38

The tail wags the dog

Question 39

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

Answer 39

15N

Question 40

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?

Answer 40

Because the dock pushes back

Question 41

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

Answer 41

Because the air comes out and pushes on the balloon

Question 42

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?

Answer 42

No movement

Question 43

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

Answer 43

Force in the opposite direction

Question 44

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

Answer 44

ar=w 15(N?)