Forces
Balanced & Unbalanced Forces
Buoyant Force
Simple Machines
This & That
100
A push or pull that causes changes in motion.
What is a force?
100
Forces that act on an object by cancel each other out are called these.
What are balanced forces?
100
This force causes a ship to float in water.
What is buoyant force?
100
A tool that makes a task easier by changing the strength or direction of a force or the distance over which the force acts.
What is a simple machine?
100
These are made up of two or more simple machines.
What is a compound machine?
200
This force can make things slow down, stop, or not move at all.
What is friction?
200
When this type of force acts on an object, motion changes.
What is an unbalanced force?
200
A rubber duck floats in water. The buoyant force is equal to this.
What is the toy's weight?
200
A doorknob is an example of this simple machine.
What is a wheel and axle?
200
Using a force to move an object through a distance.
What is work?
300
The moon has less mass than Earth, so it has less of this.
What is gravitational force?
300
If the rope does not move in a game of tug of war, the forces are this.
What is balanced?
300
Buoyant force works against this force.
What is gravity?
300
A ramp is an example of this simple machine.
What is an inclined plane?
300
This force causes a ball to slow down and stop as it rolls across the floor.
What is friction?
400
This force makes a compass work.
What is magnetic force?
400
The combination of all forces acting on an object is this.
What is net force?
400
If the buoyant force on an object is equal to or greater than the object's weight, the object does this.
What is float?
400
This simple machine allows you to lift things by pulling down on a rope.
What is a pulley?
400
These two simple machines make up a shovel.
What is a lever and wedge?
500
This is the measurement of gravitational force acting on an object.
What is weight?
500
Two children are pulling on a toy. One child pulls with a force of 150 N and the other child pulls with a force of 50 N. This is the net force.
What is 100 N?
500
A marble sinks in water because its weight is greater than this.
What is the buoyant force acting on it?
500
A lever has these two parts.
What is a lever arm and a fulcrum?
500
This compound machine is made up of a series of pulleys.
What is a block and tackle?
M
e
n
u