Forces
The three states of matter are....
solid, liuid and gas
True or False
Gravity always pulls any object toward the center of the Earth.
True.
Cars need a supply of energy to move. How do they get their supply of energy?
Gas Sunlight
Food Water
Gas
Energy can be stored in battery. What kind of energy store is a battery?
Electrical Elastic
Chemical Thermal
Chemical
We measure forces in ______________.
Newtons
True or False:
A force arrow shows the speed of a force.
False
A force arrow shows the direction of a force.
Draw the force arrows of a person sitting in a chair.
Which one is the force of gravity?
Which one is the force of the chair?
Force of gravity - Arrow going down
Force of chair - Arrow pushing up
Fuels store energy. We can use fuels to drive cars. How do we get energy from a fuel?
Move it Eat it.
Burn it Do nothing
We have to burn fuels for energy.
True or False:
Thermal energy can be stored for a long time.
False
When a guitar string is stretched, what type of energy does it store?
Chemical Thermal
Elastic Electrical
Elastic
The tool we use to measure a force.
Force meter or newtonmeter
True or False.
Friction slows objects down.
True
Think of three items in the room that require energy to work.
clock, lights, fan
A boy is jumping on a bed. What type of energy does the boy have when he is high up in the air?
Elastic Gravitational Potential
Electrical Kinetic
Gravitational Potential
Object A and Object B have the same mass. Object A is moving twice as fast as Object B. Which object has less kinetic energy?
Object B has less kinetic energy.
Joe throws a ball up into the air. Draw a force arrow for:
Joe's force on the ball
The force of gravity
Joe's force on the ball- arrow going up
The force of gravity- arrow going down
Tell me the difference between weight and mass.
What units are they measured in?
When do they change?
Mass is an amount of matter. It is measured in kilograms and never changes.
Weight is a force caused by gravity. It is measured in newtons and changes when gravity changes.
When a TV is turned on, energy is transferred to the TV. What type of energy is transferred to the TV?
Elastic Chemical
Gravitational Potential Electrical
Electrical
A man stops his bike on the top of a mountain. When he rides down the mountain what will happen to his gravitational potential energy? What will happen to his kinetic energy?
His gravitational potential energy will decrease and his kinetic energy will increase.
Name 4 types or places where we can get renewable energy.
Wind Geothermal (Earth's heat)
Solar (Sun) Biomass (Plants)
Hydropower (Water
Tell me four examples of what you can do with force.
You can use force to push an object.
You can use force to pull.
You can use force to turn
You can use force to stretch .
A man is pushing a box of fruit along a rough road. He is too tired to push anymore. There is a nice road nearby. It has a smooth surface. How can he make the force of friction on his box of fruit smaller? Give me two ideas.
He can take some fruit out of the box. (less weight)
He can take the box to the nice road. (smooth surface)
I turn on a lightbulb. What types of energy are released from the lightbulb?
Electrical Light
Chemical Heat
Light and Heat
Name the three kinds of non-renewable energy we have studied. Give two reasons why we should try to use less non-renewable energy.
Gas, oil, and coal
We should try to use less non-renewable energy because,
1.) it makes a lot of pollution
2.) They take millions of years to make.
Bill is an astronaut. He just came back from the Moon. He said that it was easier to lift heavy objects on the Moon. Tell me why this is true.
The Earth has more mass than the Moon. When an object has more mass, it has a stronger gravitational pull. This means that things on Earth will weigh more than what they weigh on the Moon.