Energy is the ability to do work.
work is the ability to MOVE something
100
What makes objects pull together?
Gravity
100
What is friction?
A force that acts when two surfaces rub together. slows and stops objects in motion
200
What is speed? and what does it measure?
speed is the rate at which an object changes. And it measures how fast an object moves.
200
Some forces act only on____ while others can act at a ____
Contact & Distance
200
Can energy be made or destroyed?
No
200
How do scientists measure force?
Through Newtons
200
what two factors affect the amount of friction between two objects?
Surface and on how hard the objects press together.
300
What combines both the speed and the direction an object is moving? What are some words words that are associated with velocity?
velocity; north, south, up, down (Directions)
300
What happens when balanced forces act in opposite directions?
They cancel each other out.
300
Do all things have potential energy?
Yes!
300
What is the difference between mass and weight?
Mass is the amount of matter in an object
Weight is the measure of the force of gravity acting on that object's mass
300
Is there more friction on smooth surface or rough surface?
Smooth surface
400
Any CHANGE in the speed or direction of an object's motion.
acceleration.
400
What is needed to change the motion of an object with more mass?
More force
400
What is kinetic energy? what is potential energy?
Kinetic energy is the energy of motion
Potential energy is stored energy
400
Doubling the mass of one object _____ the force of graviy between it and another object.
Doubles
400
What produces more friction, a box of stones or a box of feathers? why?
box of stones, because the box of stones press against the floor with more force
500
What is Relative motion?
The change in one object's position compared with another object's position
500
The size of change depends on the ____ of the push or pull.
Strength
500
Explain how a rubber band can transfer energy.
rubber band has potential energy, you stretch it and shoot it, the motion becomes kinetic energy, then it lands on the floor and reverts back to potential energy
500
What two factors affect the force of gravity between two objects?