Show:
Motion
Forces
Energy
Friction and Gravity
Miscellaneous
100
A moving merry-go-round is an example of what type of motion?
Curved
100
What is the definition of a force?
A force is any push or pull.
100
Give an example of potential energy.
A stretched rubber band, the tightened spring in a wind-up toy, a ball that is being held still or is not moving on the ground.
100
Gravity makes objects _______ toward each other.
Pull
100
Force is measured in ________.
Newtons
200
The change in one object's position compared with another object's position is ____________.
Relative motion
200
Give an example of a force that must touch an object in order to affect it.
Any example in which something contacts the object.
200
Give an example of kinetic energy.
All moving things have kinetic energy. Swings, running dogs, bouncing balls, etc.
200
What two factors affect the force of gravity between two objects?
The objects' masses and the distance between them.
200
Friction comes from the Latin word fricare, which means ___________.
"To rub"
300
When a player plucks a guirtar string, the string moves back and forth. This back-and-forth motion is known as __________.
Vibration
300
Give an example of a force that does not make contact with the object.
Without any contact, a magnet can pull a piece of iron toward it.
300
Work is the ability to ________ something.
Move
300
What tool is used to measure force?
A spring scale.
300
Speed is the rate at which an object _________ position.
Changes
400
Objects that don't seem to move define your _________________.
Frame of motion
400
If two dogs pull a frisbee with forces that are the same size, what will happen?
The forces are balanced and the toy will not move.
400
The amount of kinetic energy depends on an object's _______ and _______.
Speed and mass
400
What is friction?
Friction is a force that acts when two surfaces rub together.
400
What is the relative motion of a person who is running past you?
The person is moving ahead of you.
500
What two things must be measured in order to describe an object's velocity?
Its speed and direction
500
In what ways can a force make an object move? Give at least 2 examples.
A force can make an object start to move, speed up, slow down, stop, or change direction.
500
What kinds of energy are seen in a rocking chair that is rocking back and forth?
Both kinetic and potential energy.
500
The amount of friction between two objects depends on the object's _______ and _______.
Surface and mass
500
What is inertia?
The resistance an object has to any change in its motion.