Directed Reading Ch. 9-1

What do you call the ability to do work?
a. movement
b. energy
c. power
d. force

b. energy

Work is the transfer of_______.

energy

How is energy transferred when one object does work on another?

By letting the 2nd object do work on the 1st object

What units are used to express this energy transfer?

Joule

Which of the following is the energy of motion?
a. potential energy
b. mechanical energy
c. kinetic energy
d. gravitational energy

c. kinetic energy

In the formula for kinetic energy, what does the m stand for?
a. more
b. moving
c. mass
d. meter

c. meter

How does increasing mass affect kinetic energy?

It affects kinetic energy because the faster the object is moving, the greater the velocity.

Speed has a greater affect on_________energy than mass does?

kinetic

Why are car crashes more dangerous at higher speeds than at lower speeds?

Because the friction will have a greater force between the car(s) and the road

The energy an object has because of it's position is___________energy.

potential

When you lift an object, energy is transferred to the object, which gives the object________.

energy

The amount of gravitational potential energy that an object has depends on its weight and______.

mass

What formula do you use to calculate gravitational potential energy?

GPE=w(h)

The amount of force that you must on an object to lift it is_______________________________.

gravitational potential energy

How is the height of an object determined?

In meters

Which energy equals the total energy of motion and position?
a. mechanical energy
b. kinetic energy
c. potential energy
d. moving energy

a. mechanical energy

What formula do you use to find mechanical energy?

ME=PE+KE

The juggler moves the pin with his hands and gives____________energy to the pin.

mechanical

As the juggler's pin leaves his hand, the pin's kinetic energy begins to change to___________energy.

potential

How can you tell that the kinetic energy is decreasing as the juggler's pin falls?

Because as the pin starts to fall it slows down.

Energy caused by an object's vibrations

a. sound energy

Energy that comes from changes in the nucleus of an atom

c. nuclear energy

All of the kinetic energy due to random motion of the particles that make up an object

g. thermal energy

Energy of moving electrons

b. chemical energy

Energy of a compound that changes as its atoms are rearranged

f. mechanical energy

Energy produced by the vibrations of electrically charged particles

e. electrical energy