c 4-5

Question 1

Relationship between acceleration and net force?

Answer 1

Acceleration is directly proportional to net force

Question 2

Static friction vs. sliding friction

Answer 2

Static friction is greater than sliding friction. Example: Tires that are locked up from braking provide less friction than tires that are rolling.

Question 3

Relationship between mass and acceleration?

Answer 3

Inversely proportional - The same force applied to twice the mass produces half the acceleration.

Question 4

How does mass relate to inertia?

Answer 4

The greater the mass, the greater the inertia

Question 5

How is mass different than weight?

Answer 5

Mass is the quantity of matter in an object. It is also the measure of the inertia that an object exhibits in response to an effort to push/pull/change its state of motion. Weight is usually the force upon an object due to gravity.

Question 6

Newton’s second law

Answer 6

Law of acceleration… When a net force acts on an object, the object will accelerate. The acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object.

Question 7

acceleration

Answer 7

the rate at which velocity itself changes

Question 8

Acceleration in regard to mass

Answer 8

a = Fnet/m, Fnet = m*a, m = Fnet/a Mass resists acceleration - inversly proportional - twice the mass produces half the acceleration, thrice the mass produces 1/3 the acceleration.

Question 9

Why doesn’t a stack of two bricks fall faster than one brick?

Answer 9

Because the acceleration of an object depends not only on force, but on its resistance to motion (inertia). (Tw exerted on an object with twice the inertia produces the same acceleration as half the horce exerted on an object with half the inertia!)

Question 10

Why would a feather and a coin fall at equal rates in a vacuum?

Answer 10

Because the ratios of force to mass for each are equal. (Not because forces of gravity are equal!!)

Question 11

Terminal speed

Answer 11

The speed at which the acceleration of a falling object terminates because air resistance balances gravitational force.

Question 12

Terminal velocity

Answer 12

Terminal speed with direction specified.

Question 13

Who reaches the ground first? A lighter or heavier parachuter?

Answer 13

The heavier because they achieve a higher terminal speed. The lighter person hits terminal speed first. It takes the heavier person longer to reach terminal speed, and they will be moving faster when it is reached.

Question 14

When does acceleration stop in a free falling object?

Answer 14

If and when air drag builds up equal to gravitational force.

Question 15

Friction

Answer 15

Resistive force force that opposes the motion or attempted motion of an object

Question 16

Kg

Answer 16

The fundamental unit of mass.

Question 17

Newton

Answer 17

The SI unit of force. One newton is the force that will give an object of mass 1kg an acceleration of m/s2.

Question 18

Kg

Answer 18

The SI unit of mass.

Question 19

Newton’s third law

Answer 19

Law of action and reaction…

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. To every action there is always an opposed equal reaction.

Question 20

Does a speeding missile possess force?

Answer 20

No! Force is not something an object has (like mass), but is part of an interaction between one object and another.

Question 21

Third law - 5 things about action/reaction forces

Answer 21

1. one force is the action, the other the reaction
2. are co-pairs of a single interaction
3. neither force exists without the other
4. are equal in strength and opposite in direction
5. always act on different objects.

Question 22

Newton’s first law

Answer 22

Law of inertia…

An object at rest tends to remain at rest, an object in motion tends to remain in motion at a constant speed along a straight line path.
If zero netforce, velocity remains the same!

Question 23

A free falling object gains? Does acceleration remain constant?

Answer 23

10 m/s Acceleration is constant! Always the same amount in each passing second.

Question 24

Do force and velocity vectors combine together?

Answer 24

No. Only force with force and velocity with velocity

Question 25

What is the measure for mass?

Answer 25

kilogram!!

Question 26

What is the measure for weight?

Answer 26

newton!!