Final Exam Study Guide

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# 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 &amp; Time. What is the speed of an object at rest?. Zero Km/hr.

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

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

The SI unit for acceleration is

Meter per second2

m/s2

On a velocity-time graph, a line with a negative slope indicates that the object is

Slowing Down

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

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

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

Moon & Earth

The law that states that every object maintains constant velocity unless acted on by an unbalanced force is

First

The law that states that for every action force there is an equal and opposite reaction force is

Third

The law that states that the unbalanced force acting on an object equals the object’s mass times its acceleration is
The SI unit of force, named for the scientist who described the relationship between motion and force, is called the

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
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

A weightlifter presses a 200 N weight 1 m over his head in 2 seconds. What is the power of the weightlifter?

100W

A medicine ball has a mass of 10 kg and is thrown with a speed of 2 m/s. What is its kinetic energy?

20J

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

conduction

The transfer of energy by the movement of fluids or gases with different temperatures is called

convection

Which of the following substances is the best conductor of transferring energy as heat?a. carbon dioxide gas c. ironb. water d. rubber
A cold-blooded reptile basks on a warm rock in the sun. Its body is warmed by

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