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Final Exam Study Guide

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Final Exam Study Guide

- Average Speed

Distance & Time

- What is the speed of an object at rest?

Zero Km/hr

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

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

- moves in a point of reference

increasing

- How can the friction on a slide be reduced?

Add water

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

- Newton’s 3rd Law

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

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

height gravity and mass

20J

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

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

radiation

Radiation

Radiation and conduction

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