Forces & Motion
This type of friction causes you to slip on an icy sidewalk.
Sliding Friction
This non-contact force acts between charged objects.
Electrical Force
A winding trail up a hill is this kind of machine.
Inclined Plane
A person lifting and lowering dumbbells is doing this.
Work
This term describes how one object’s position changes relative to another.
Relative Motion
To solve for acceleration, you divide the net force by this.
The Object's Mass
A book supported by a table demonstrates this type of force.
Normal Force
This tool includes a wedge to cut into the ground and a handle that works as a lever.
Shovel
If a 400-N girl climbs 2 meters in 20 seconds, this is her power.
40 Watts
This part of a pencil sharpener is the wedge.
The blade / Cylindrical Cutter
This force of attraction exists between any two objects with mass.
Gravity
Satellites stay in orbit due to this non-contact force.
Gravity
Pliers are an example of this class of lever.
First-Class Lever
When a 6-N force moves an object 2 meters, this amount of work is done.
12 Joules
The development of machines and tools led to this major shift in industry.
Industrial Revolution
When net forces are balanced, this happens to an object’s motion.
No Change In Motion
Particles inside atoms are held together by this.
Nuclear Force
A nutcracker demonstrates this class of lever.
Second-Class Lever
Lucy and Ben carry the same box from their classroom to the Library. Lucy takes 10 minutes, and Ben takes 7 minutes. Who uses more power?
Ben
Machines replaced these for manufacturing products like cloth and tools.
Hand Tools
This keeps a moving object going in a straight line at constant speed.
Inertia
When you play tug-of-war, this type of force is at play.
Contact Force Push or Pull
A fishing rod works as this kind of lever.
Third-Class Lever
Robert pulling his sister in a wagon is an example of this.
Work
A line slanting up on a speed-time graph means this.
The object is Speeding Up