Basics and Terminology 2

Question 1

Action (push or pull) upon a body causing it to deform or move =

Answer 1

force

Question 2

Force is measured in what?

Answer 2

newtons

Question 3

Force is a _____ quantity.

Answer 3

vector

Question 4

Force =

Answer 4

Mass x acceleration

Question 5

_____ and ______ are most important in adjusting.

Answer 5

Speed and tension

Question 6

Newton’s first law of motion is aka:

Answer 6

Law of inertia

Question 7

The resistance to having its state of motion changed by application of force is called what?

Answer 7

inertia

Question 8

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by and unbalanced force.

Answer 8

Newton’s 1st Law of Motion/ Law of Inertia

Question 9

A system in equilibrium is either _____ or _____.

Answer 9

At rest

Moving with a constant velocity.

Question 10

Newton’s 2nd Law of motion aka

Answer 10

Law of Force and Acceleration

Question 11

The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

Answer 11

Newton’s second Law/ aka

Law of Force and Acceleration

Question 12

What is a visual to help with Newton’s 2nd law. (inversely related to mass)

Answer 12

Person pushing a basketball and pushing a car. Same force, basketball moves, car does not.

Question 13

Newton’s Third Law of Motion aka

Answer 13

Law of Action and Reaction

Question 14

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

Answer 14

Newton’s 3rd Law, law of action and reaction.

Question 15

Every action force is met with and equal and opposite reaction force. Does every ACTION produce and equal and opposite reaction?

Answer 15

No (b/c of second law)

Question 16

Force always comes in pairs =

Answer 16

Equal and opposite action-reaction force pairs

Question 17

A girl on skates vs. a girl on floor with shoes throwing a ball. Which law does this help show?

Answer 17

3rd Law

Question 18

The intensity of force perpendicular to the surface on which it acts is called what?

Answer 18

Normal stress

Question 19

The intensity of force parallel to the surface on which it rests is called what?

Answer 19

Shear stress

Question 20

This exists when two contacting surfaces are not currently sliding relative to each other but do possess the POTENTIAL for movement.

Answer 20

Static friction

Question 21

The ratio required to initiate a sliding motion between two bodies is called:

Answer 21

Coefficient of (static) friction

Question 22

0.0 coefficient of friction is:

Answer 22

frictionless

Question 23

1.0 coefficient of friction is:

Answer 23

Maximum friction

Question 24

Friction in cases when the two surfaces are already sliding relative to each other:

Answer 24

Kinetic friction

Question 25

Kinetic friction aka:

Answer 25

Dynamic friction

Question 26

As soon as the applied parallel force exceeds the static friction force and the object begins to slide, what happens to the friction force?

Answer 26

decreases

Question 27

When forces are exerted and objects are in contact what else is important?

Answer 27

pressure

Question 28

The magnitude of applied force acting over a given area. (F/A=)

Answer 28

pressure

Question 29

Pressure is measured in what?

Answer 29

Pascal (Pa)

Question 30

Maximum stretch a material can withstand without rupture is called what?

Answer 30

Tensile strength

Question 31

What is the tensile strength of skin?

Answer 31

9.25 N/mm2

Question 32

Performed when an object is displaced by the application of force.

Answer 32

work

Question 33

Work is measured in :

Answer 33

joules

Question 34

If the object is not displaced was any work performed?

Answer 34

no

Question 35

The energy an object possess due to motion.

Answer 35

Kinetic energy

Question 36

Car 1 is stopped and Car 2 hits car one. Which car performed work? Why?

Answer 36

Car 2 | b/c force was applied by Car 2 to make Car 1 move.

Question 37

Since velocity is squared in the equation for kinetic energy what does that mean?

Answer 37

Changes in velocity have large effects of kinetic energy