A swinging pendulum changes velocity because this changes.
What is direction.
200
The objects used for comparing position are called this.
What is frame of reference?
200
This is a push or pull that can change the motion of an object or stop an object.
What is force.
200
The mass of the sun is greater than the earth so it has a greater force of ______________.
What is gravity.
300
The amount of space between two object or places.
What is distance.
300
Any change over time in the speed or direction of an object.
What is acceleration.
300
The reason we do not fly into the sun, even though it's gravitational pull is stronger than Earth, is due to this.
What is distance.
400
The change in distance divided by the change in time.
What is speed.
400
This is the tendency of an object to keep moving if it is in motion or to stay at rest if it is at rest.
What is inertia.
400
A smooth slick surface has less of this than a rough surface. Example: Water on a water slide reduces this, causing one to slide down faster than on a regular slide.
What is friction.
500
This describes an objects speed - distance over time - AND direction of motion.
What is velocity.
500
This force works AGAINST motion and acts between the surfaces of objects that touch.
What is friction.
500
A car has just traveled 100 kilometers. What else does one need to know in order to calculate its average speed?