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52 Cards in this Set

  • Front
  • Back
a push or a pull
force
a change in position
motion
the measure of how fast something moves over a certain distance
speed
the force that pulls objects towards each other
gravity
the measure of the pull of gravity on an object
weight
examples of pushes
push a chair
push a car
roll a ball
push a cart
push a lawnmower
examples of pulls
pull a door
pull a string
pull a truck tailgate
pull a toy
What are some forces?
push or pull
What causes motion?
a force
Put in order from least to greatest speed:
person biking
race car
person walking
race horse
person walking
person biking
race horse
race car
What does weight measure?
the effects of gravity on an object
What would be a strong force?
gravity
How are the motions of a car and plane alike?
motion caused by a force
change in position
How are the motions of a car and plane different?
Different speeds
Use different force to move
What is the result of unbalanced forces?
motion
What is the result of balanced forces?
nothing happens
Two cars travel the same distance. What would tell you that one car had a faster speed than the other car?
The car that gets there first has the faster speed.
Where is gravity greater, on Earth or the moon?
The Earth because earth has more mass than the moon.
Where would your weight be greater, on Earth or the moon?
On Earth because the moon is smaller (less gravity).

If you weighed 100 pounds on earth, you would weigh 16.6 pounds on the moon.
Work or no work:
Push a roller chair across the room
Work
Take a crayon out of the crayon tub
work
Kick a ball
work
Write a number on the chalkboard
work
Turn the pages and read a book
work
Watch a video
no work
Push against the chalkboard with your hand
no work
Walk to the door
work
Don't move. Sit where you are
no work
Read the words on the bulletin board
work
Write your name using a computer
work
Ride in a car
no work
Where are forces?
Forces are all around us. They allow us to run, throw a ball, or ride a bicycle.
T/F
If an object is at rest, it will remain at rest forever?
False. It will remain at rest until a force (push/pull) is applied to it.
T/F
An object in motion will continue to move in a straight line at a constant speed unless a force acts on it.
True
T/F
When the force on an object is decreased, the speed increases.
False.
Increase in force causes increase in speed
A force caused by two objects rubbing against each other
Friction
T/F
The motion of an object is affected by friction.
True
A force that gives things weight and makes them fall.
Gravity
T/F
The motion of an object is not affected by gravity.
False
T/F
A force can change the direction an object is moving.
True
T/F
A force cannot change the shape of an object.
False
A cyclist pedals harder to pass another cyclist.

Force Fact:
When the force on an object is increased, the speed increases.
A diver bounces off a diving board and plunges down into the water.

Force Fact:
The motion of an object is affected by gravity.
A golfer putts a ball into the cup at the 18th green.
Force Fact:
If an object is at rest, it will remain at rest until a force is applied to it.
A tennis player hits a ball back into his opponent's court.
Force Fact:
A force can change the direction of an object is moving.
A baseball player slides into third base.
Force Fact:
The motion of an object is affected by friction.
A race-car driver turns the steering wheel of her car as she moves around the track.
Force Fact:
A force can change the direction an object is moving.
A bicycle tire fills with air.
Force Fact:
A force can change the shape of an object.
A race-car driver slams on the brakes.
Force Fact:
An object in motion will continue to move in a straight line at a constant speed unless a force acts on it.
A football player kicks a field goal.
Force Fact:
If an object is at rest, it will remain at rest until a force is applied to it.
A soccer goalie saves a goal.
Force Fact:
An object in motion will continue to move in a straight line at a constant speed unless a force acts on it.
T/F
I like getting good grades on tests?
????