Dynamixs

Question 1

What is the study of dynamics?

Answer 1

The study of how things move (focuses on forces that cause objects to change their state of motion) ex: speed⬆️, slow⬇️ or change direction

Question 2

Force:

Answer 2

Cause he push or pull action (causes objects to change their state of motion) has size and magnitude (vector quantity)

Question 3

What r the 4 fundamental forces:

Answer 3

1. Gravity 2. Weak nuclear 3. Electromagnetic 4. Strong nuclear

Question 4

Gravity::

Answer 4

(Very weak) attractive only!

Question 5

Weak nuclear:

Answer 5

(10^25 x stronger than gravity) inside the nucleus and attractive or repulsive!

Question 6

Electromagnetic:

Answer 6

(10^36 x stronger than gravity) electric charges, magnetism, light. Attractive or repulsive!

Question 7

Strong nuclear:

Answer 7

(10^38 x stronger than gravity). Holds the nucleus of an atom together. Attractive or repulsive !

Question 8

Newtons 1st law:

Answer 8

A measure of an objects resistance to change of motion.

Question 9

What do objects at rest tend to do?

Answer 9

Stay at rest

Question 10

What do objects in motion tend to do?

Answer 10

Stay in motion

Question 11

When is an objects motion only changed?

Answer 11

When an external force acts on it.

Question 12

What does mass have to do with inertia?

Answer 12

Mass is a measure of inertia.

Question 13

What happens to the inertia of the mass increase or decreases?

Answer 13

Mass ⬆️, inertia ⬆️ (more resistance to change in motion)

Question 14

Balanced forces have a v & a of?:

Answer 14

V= 0m/s a= 0m/s/s

Question 15

Examples of first law

Answer 15

Hockey puck sliding, throwing ball, car crash

Question 16

Newtons 2nd law:

Answer 16

Mathematical + universal relationship between unbalanced force applied to object (mass and resulting a. if the object)

Question 17

Proportional relationship occurs when:

Answer 17

Masses r the equal and forces are different

Question 18

Inversely proportional occurs ?

Answer 18

When masses are different and forces the same

Question 19

If F goes up, a ?

Answer 19

A goes up

Question 20

If F goes down , a?

Answer 20

Goes down

Question 21

If m goes up, a ?

Answer 21

Goes down

Question 22

If m goes down, a ?

Answer 22

Goes up

Question 23

If m is up, a is constant, F ?

Answer 23

Goes up

Question 24

If m is down, a is constant, F?

Answer 24

Goes down

Question 25

Net force:

Answer 25

Unbalanced forces. The sum of all forces acting in an object. Forces that cause change in the motion of an object.

Question 26

F net is 0, a is 0 only when:

Answer 26

1. Objects stays at rest.

2. Keeps at a constant speed

Question 27

Newtons 3rd law :

Answer 27

For every forces there is an equal opposite reaction force. (Force acts on different bodies)

Question 28

If forces are unbalanced:

Answer 28

Object starts to move.

-if already loving, it changes direction or speed

Question 29

Crumple zone:

Answer 29

A zone of an object that absorbs energy upon impact

Question 30

What is the purpose of a crumple zone in cars?

Answer 30

The increase amount of time it takes for car to completely stop in a crash. Increasing time spreads force over longer period of time

Question 31

3rd law examples/

Answer 31

Jumping and hammer and nail

Question 32

Do all object accelerate at the same rate

Answer 32

On earth they do.

Question 33

What factor affects the rate at which objects fall?

Answer 33

Acceleration of gravity, air resistance, friction

Question 34

Difference between mass and weight

Answer 34

Weight is the force of gravity acting on an object . Mass is the “stuff” that makes up an object.

Question 35

Terminal velocity:

Answer 35

The constant speed an object reaches in free fall (no a)

Question 36

How is terminal velocity reached?

Answer 36

The force of air resistance is equal to the speed and weight of the falling object.

Question 37

Normal force:

Answer 37

Contact force that acts perpendicular to the surface in contact ;newtons third law b!)

Question 38

Friction:

Answer 38

The force that resists the motion of an object.