Forces
Friction
Energy
Work It
Machines
100
Forces cause objects to do this.
What is change its motion?
100
The force that slows down moving objects.
What is friction?
100
Stored energy or the energy that an object has because of its position.
What is potential energy?
100
Energy is the ability to do this.
What is work?
100
A machine that has one or two parts.
What is a simple machine?
200
A force that pulls two objects together.
What is gravity?
200
Friction occurs when this happens.
What is when two objects rub against each other.
200
Kicking a soccer ball is an example of this.
What is kinetic energy?
200
You need energy and this to show that work is being done.
What is has to move?
200
A machine that has more than one simple machine.
What is a compound machine?
300
A force that makes a moving object stay still or keep moving.
What is inertia?
300
The brakes on a car work, because of this much friction.
What is more friction?
300
A car that runs on gasoline is an example of this kind of energy.
What is chemical energy?
300
DOUBLE JEOPARDY! When you are on a slide, when do you have the most potential energy and when do you change to kinetic energy?
What is you have the most potential energy when you are at the top of the slide and you change to kinetic when you are sliding down the slide?
300
A knife or a nail is an example of this simple machine.
What is a wedge?
400
Astronauts weigh less on the moon because of this.
What is the moon has less gravity?
400
These two forces can help a rolling ball stop or slow down.
What is gravity and friction?
400
A radio can use this kind of energy when plugged into a wall socket.
What is electric energy?
400
DOUBLE JEOPARDY! Astronauts have less gravity on the moon because of this.
What is the moon has less mass than the earth?
400
Compound machines are powered by these two things.
What is electricity or other fuels?
500
If you kicked a soccer ball and then your friend kicked it back, you did this to the ball.
What is change its direction?
500
Which one of these would decrease friction: a bumpy road or an icy road?
What is an icy road?
500
A wind up toy or bicycle uses this kind of energy.
What is mechanical energy?
500
If two people are carrying two different backpacks, how do you know which one is doing more work?
Who is the one carrying the heaviest backpack?
500
A pair of scissors is an example of this.
What is a compound machine?
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