Unit 2: Dynamics

Question 1

A unitless, positive constant number that represents the force necessary to move surfaces against each other and the pressure between surfaces (Depends on texture, diff for every surface)

Answer 1

Coefficient of Friction

Question 2

Friction depends on what?

Answer 2

1. Surface texture/roughness

2. Weight (Fg)

Question 3

T or F, surface area changes value of frictional forces

Answer 3

False

Question 4

Which is greater, static or sliding friction?

Answer 4

Static.

Question 5

Does speed of two objects sliding against each other affect friction?

Answer 5

No.

Question 6

What describes the way objects are affected when they interact with each other?

Answer 6

Force

Question 7

What is the formula for force due to gravity?

Answer 7

F=mg

Question 8

What is the formula for force of friction

Answer 8

Ff = (mu)Fn

Question 9

Coefficient of friction is dependent on what?

Answer 9

Texture and weight.

Question 10

What is the force that keeps an object from sliding against another?

Answer 10

Static friction.

Question 11

What is the force opposing the motion of an abject sliding against another?

Answer 11

Sliding friction.

Question 12

What do you call the force exerted on an object by a contact surface?

Answer 12

Normal force.

Question 13

What is gravity’s inverse square law?

Answer 13

Gravity of an object is inversely related to the square of the separation distance.

Question 14

What is the formula for inverse square law for gravity

Answer 14

g2 = 1/d^2 x g1

Question 15

What is the field of attraction that attracts objects to the core of anything with mass?

Answer 15

Gravity (Gravitational field strength)

Question 16

Gravity depends on what?

Answer 16

mass of object creating field and distance away from object creating field.

Question 17

If distance goes up gravity goes_____

Answer 17

down

Question 18

Properties of gravity

Answer 18

• Vector
• Acceleration
• Always negative
• Constant (field exists whether something is in it or not)

Question 19

What is force of gravity’s inverse square law?

Answer 19

Intensity of Fg changes in inverse proportion to the square of distance between two objects.

Question 20

What do you call the force attractsany object with mass to an object with bigger mass?

Answer 20

Gravitational force (Fg).

Question 21

What is the unit of Fg

Answer 21

Newton

Question 22

Fg depends on what

Answer 22

mass of objects in gravitational field and distance between them.

Question 23

Properties of Fg

Answer 23

• Vector
• Always negative
• Attractive force

Question 24

What is Hooke’s law?

Answer 24

The extension of an elastic is directly proportional to the force applied to it.

Question 25

What is the formula for hooke's law?

Answer 25

F=Kd

Question 26

What do you call the force that impedes the movement of two objects moving against each other?

Answer 26

Sliding friction / Kinetic friction

Question 27

Newton's first law

Answer 27

Law of inertia, objects at rest or in motion remain so unless acted on by an outside force (Fnet statements)

Question 28

Newton's 2nd law

Answer 28

Fnet = manet

Question 29

Newton's 3rd law

Answer 29

For every action, there is an equal and opposite reaction. Fa = Fa'

Question 30

Gravitational mass formula

Answer 30

m=Fg/g

Question 31

Inertial mass formula

Answer 31

m=Fnet/anet

Question 32

Which law states that in a collision between 2 objects, the total momentum of the 2 objects before the collision = the total momentum of the objects after the collision

Answer 32

Law of conservation of momentum.

Question 33

What is the formula for law of conservation of momentum?

Answer 33

m1v1 + m2v2 = m1v1' + m2v2'