Show:
forces and motion
work
machines
mixed
3rd grade science
100
a push or a pull
What is a force?
100
It takes more force to move a bowling ball than a basketball because the bowling ball has more of this.
What is mass?
100
A tool that helps people do work.
What is a simple machine?
100
The measure of how fast something moves over a certain distance.
What is speed?
100
Farmers conserve soil by using these.
What are strip cropping and/or contour plowing used for?
200
A change in position is called
What is motion?
200
When a force moves an object, scientists say _______is done.
What is work?
200
A bar that moves on or around a fixed point.
What is a lever.
200
Several simple machines put together.
What is a compound machine?
200
a type of rock formed when lava cools
What is an igneous rock?
300
The only human-made objects to overcome gravity and leave the earth's atmosphere.
What is a rocket?
300
An example of a force that doesn't cause motion.
What is pushing on a wall or other object that doesn't move?
300
The units used to measure work.
What are newton-meters?
300
The distance the truck moves divided by the time it takes.
What is the truck's speed?
300
The stages a rock goes through when it changes from sedimentary to metamorphic to igneous.
What is the rock cycle?
400
The force that pulls objects toward each other
What is gravity?
400
You must multiply the force needed to move the object by the distance the object moves.
What is figuring out how much work is done?
400
A flat surface set at an angle to another surface.
What is an inclined plane?
400
There is no movement even though forces are at work.
What is happening when there are balanced forces at work?
400
the first stage in the life cycle of a frog.
What is an egg?
500
The measure of the pull of gravity on an object.
What is weight?
500
The amount of work you do when you push a wheelbarrow 5 meters using 4 newtons of force.
What is 20 newton-meters of work?
500
the simple machine used to raise and lower a flag.
What is a pulley?
500
a wheelchair ramp
What is an expamle of an inclined plane?
500
A truck traveling 200 miles arrives in 4 hours. Figure the rate of speed.
What is a speed of 50 miles per hour?