Which is the following is an example of work, to a scientist?
solving a mental math problem
carrying a book across the room
pushing against the floor
lifting a chair of the floor?
2. Multiple Choice
1.5 minutes
1 pt
A simple machine is a device that helps to reduce the amount of _____ required to work.
force
energy
work
3. Multiple Choice
1.5 minutes
1 pt
____ is done when a force is applied over a distance.
energy
work
force
4. Multiple Choice
1.5 minutes
1 pt
A _____ is a fixed bar that us free to move around a fixed point known as a fulcrum.
pulley
inclined plane
lever
5. Multiple Choice
1.5 minutes
1 pt
A ______ is a grooved wheel with a rope running along the groove.
lever
pulley
screw
6. Multiple Choice
1.5 minutes
1 pt
A _____ pulley only changes the direction of the force.
movable
fixed
alternate
7. Multiple Choice
1.5 minutes
1 pt
A sloping force, like a ramp, that reduces the mount of force required to lift an object.
screw
wheel and axle
inclined plane
8. Multiple Choice
1.5 minutes
1 pt
How can an incline plane reduce the amount of force required to lift an object?
increase the length of the ramp
increase the height of the ramp
decrease the length of the ramp
9. Multiple Choice
1.5 minutes
1 pt
A simple machine that can split things apart or hold a door open.
wedge
screw
lever
10. Multiple Choice
1.5 minutes
1 pt
A simple machine that is made up of an incline plane wrapped around a cylinder. It is often used to hold things together.
lever
screw
wedge
11. Multiple Choice
1.5 minutes
1 pt
Flagpole
wedge
pulley
incline plane
wheel and axle
12. Multiple Choice
1.5 minutes
1 pt
Lightbulb
wedge
pulley
incline plane
screw
13. Multiple Choice
1.5 minutes
1 pt
Stairs
wedge
pulley
inclined plane
wheel and axle
14. Multiple Choice
1.5 minutes
1 pt
This device
wedge
lever
incline plane
wheel and axle
15. Multiple Choice
1.5 minutes
1 pt
This device
wedge
lever
incline plane
wheel and axle
16. Multiple Choice
1.5 minutes
1 pt
Screws and wedges are examples of what other type of simple machine?
pulley
inclined plane
levers
gears
17. Multiple Choice
1.5 minutes
1 pt
What type of simple machine is this?
wheel and axle
gear
lever
inclined plane
18. Multiple Choice
1.5 minutes
1 pt
Name this simple machine.
Screw
Lever
Pulley
Wedge
19. Multiple Choice
1 minute
1 pt
What type of simple machines does the photo show?
Lever and Wedge
Inclined Plane and Lever
Pulley and Wedge
Lever and Screw
20. Multiple Choice
1.5 minutes
1 pt
Tammy and Johnny are loading boxes onto identical trucks. Tammy slides the boxes up a ramp that is 1 meter long. Johnny uses a ramp that is 2 meters long. Who uses more force?