# Physics Final

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Professor Batley POP 101 Chapters 1-5

Zero

Inertia

100 N

Compression.

time.

direction.

### Galileo discovered that something remains unchanged for balls rolling down inclined planes. What remains the same as the motion progresses?

A change in speed is the same in equal times.

6 seconds

### The hang time of a pro b-ball player is usually

less than a second.

doubles

### Push a cart along a track so twice as much net force acts on it. If acceleration remains the same what is the reasonable explanation?

The mass of the cart doubled when the force doubled.

10 N

increases

g

### Can a boxer exert a force of 50 N on a piece of paper? The tissue paper is mid air with no wall.

No, it can NOT be done.

pavement

### The team that wins the tug-of-war is the team that

pushes harder on the ground

### A massive fast moving car collides with a light slow moving car, the acceleration is great for?

It the same for both.

increased.

more or less

### What is the scientific method?

The general process by which we explore science - eliminating human bias.

### What is Newtons 1st?

An object in motion tends to stay in motion (unless acted on by outside force) and an object at rest tends to stay at rest (unless acted on by outside force).

### Suppose you and a pair of life preservers are floating down a swift river, as shown. You wish to get to either of the life preservers for safety. One is 3 meters downstream from you and the other is 3 meters upstream from you. Which can you swim to in the shortest time?

Both require the same.

Track B.

More.

### What is Newton's 2nd?

Sum of forces = mass x acceleration
Sum of forces -> net force
For the same force
Smaller mass, has larger acceleration
Larger mass, has smaller acceleration
F=ma

### Galileo is credited with being the first to identify the concept of inertia and the first to develop the concept of acceleration. And like others, he discussed forces. But he didn't connect these basic concepts. Which law of Newton makes the connection that Galileo missed?

2nd law of motion

### Two identical spring-loaded dart guns are simultaneously fired straight downward. One fires a regular dart; the other a weighted dart. Which dart hits the ground first?

The Regular dart.

Elephant

the iron ball

decreases

### What is Newton's 3rd?

For every action there is an equal and opposite reaction
I cannot push on you any harder than you push on me
A bug and a bus feel the same force upon impact

### Arnold Strongman and Suzie Small pull on opposite ends of a rope in a tug of war. The greater force exerted on the rope is by

Neither. The force is the same.

Increased

### Define Inertia

the property of things to resist changes in motion

a push or a pull

### Net Force is

the vector sum of force that act on a n object

### Mechanical Equilibrium is

the state of an object of system of objects for which there are no changes in motion

### Instantaneous speed

is the speed at any instant

### Vector quantity is

quantity that has both magnitude and direction.

### free fall

is motion under the influence of gravity only

### scalar quantity is

quantity that can be described by magnitude w/o direction.

### Volume is

the quantity of space an object occupies.

### Define terminal speed

the speed at which the acceleration of a falling object terminates because air resistance balances its weight. If it has direction specified it is called TERMINAL VELOCITY.

### A vector is

an arrow drawn to scale used to represent am vector quantity.

### A Resultant is

the net result of a combo of two or more vectors

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