If an object is in a different location, it has changed its _________________.
position
100
_______ is any push or pull
Force
100
During tug-of-war, when will the rope not move?
when the forces are equal
100
You do work when you actually __________ an object.
move
100
how does an inclined plane help you do work?
less effort is need to push an object a longer distance than lifting it straight up
200
If an object is in ______________ it keeps changing its position.
Motion
200
A contact force that goes against the motion of an object
Friction
200
List a force that causes a bicycle to change its motion.
Legs push pedals.
Shift your weight or turn handle bars.
Friction between tires and ground
200
Football players are pushing on each other with as much force as they can, but the players are not moving in the direction they are pushing. Are the football players doing work?
NO
200
What is an example of a wedge?
anything with one or two slanted sides that end in a sharp edge
300
What is Relative position?
position of one object compared with the position of other objects
300
Why does it take more force to push a full shopping cart than it does an empty cart?
Full cart has more mass or weight
300
Non-Contact force that pulls objects toward each other.
Gravity
300
How do simple machines help you do work?
help you do work more easily or with less effort
300
What is an example of a lever
anything with a stiff bar that rests on a support
400
____________ is the rate or how fast an object changes its position.
Speed
400
If you roll a ball, would it move farther on a tile or asphalt surface? WHY?
Tile because of less friction.
400
Non-contact force that attracts metals that have iron in them
Magnetism
400
Are you doing work while holding a puppy?
NO
400
A doorknob, ferris wheel, and merry-go-round are all an example of which simple machine?
Wheel and Axle
500
What is the difference between constant and variable speed?
Constant= objects do not change how fast or slow they move
Variable= objects move at different speeds or change speeds
500
What three factors affect how much an object moves?
1) Amount of ________ used
2) Amount of _______ the object has
3) Amount of __________ opposing the motion
1) Force
2) Mass
3) Friction
500
Why are gravity and magnetism considered non-contact forces?
They can cause an object to move without touching it.
500
What is required in order for something to be considered doing work?
a FORCE must cause an object to MOVE
500
What is a pulley used for?
to move objects to a position that is hard to reach.