This presentation is the property of its rightful owner.
1 / 51

# Final Exam Study Guide PowerPoint PPT Presentation

Final Exam Study Guide. The distance traveled by an object divided by the time it takes to travel that distance is called. Average Speed. In order to determine speed, you must know. Distance & Time. What is the speed of an object at rest?. Zero Km/hr.

Final Exam Study Guide

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

#### Presentation Transcript

Final Exam Study Guide

### The distance traveled by an object divided by the time it takes to travel that distance is called

• Average Speed

### In order to determine speed, you must know

Distance & Time

• What is the speed of an object at rest?

Zero Km/hr

### The difference between speed and velocity is that velocity includes

direction

An airplane is flying at 635 km per hour at an altitude of 35 000 m. It is currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is its velocity?

No direction = 0

• Acceleration is defined as the change in velocity divided by

Time

The SI unit for acceleration is

Meter per second2

m/s2

Slowing Down

Force

### Friction is defined as

A force that opposes motion by acting in the opposite direction of motion

A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?

• experiencing friction

### object is in motion when

• moves in a point of reference

### If the slope of a line on a distance-time graph is 1, the speed of the object being plotted is

increasing

• How can the friction on a slide be reduced?

### A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?

friction force must be equal to mg

Mass*gravity

Weight is best described as

Mass*gravity

• When objects are moved further apart from each other, the force of gravity

Decreases

The greatest gravitational force would occur between the Moon & Earth, or two marbles.

Moon & Earth

First

Third

Newton

m/s2

### Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example of

• Newton’s 3rd Law

### What is the unbalanced force that slows down a ball rolling across the floor?

Friction

• A boy pushes on a parked car with a force of 200 N. The car does not move. How much work does the boy do on the car?

W = F*d 0

### What are the units of work?

J or N*m or Kg*m2/s2

• Which of the following processes requires the most work?

• A 10 kg weight rests on a table.

• A person holds a 1 kg weight still with outstretched arms.

• A person lifts a 1 kg weight 1 m off the floor.

• d.A 10 kg ball is rolled across the floor at a constant speed for a distance of 10 m.

• A man pushes a crate along a factory floor by exerting a force of 70 N. If the crate moves a distance of 4.0 m, how much work does the man perform?

280J

What are the units of power?

Watts

100W

make

work

Height

### Gravitational potential energy depends on the

height gravity and mass

20J

### The kind of energy associated with atomic bonds is

Nuclear energy

• An object weighing 100 N is dropped from the top of a building and falls a distance of 35 m to the ground. How much work does gravity do on the object from the time it is dropped to the time it hits the ground?

3500J

### The law of conservation of energy states

that energy cannot be created nor destroyed.

Temperature is

the average kinetic energy of a molecules, feels hot or cold, can be measured

• As the kinetic energy of the molecules in a substance increases, the

heat increases temperature

The transfer of energy caused by the collision of molecules is called

conduction

convection

The End!

The End!

The End!

The End!

The End!

The End!

The End!