Unit 6: Energy, Work and Machines

A simple machine that consists a rigid bar that pivots on a fixed point

• lever

• pulley

• wheel and axle

• fulcrum

An axe is an example of a

• pulley

• inclined plane

• screw

• wedge

When force is used to move an object across a distance, this is called...

• effort

• power

• energy

• work

Tags

NGSS.MS-PS2-2

Which of the following does a simple machine do?

• allows the users to apply less force over a longer distance
• reduce the amount of force needed to do work
• change the direction of the applied force
• all of the above

How much work is done if I use 5N of force to move an object 2 meters?

• 10 Newtons

• 7 Newtons

• 10 Joules

• 7 Joules

Tags

NGSS.MS-PS2-2

Calculate the KE of a moving 4 kilogram object traveling at a velocity of 3 m/s.

• 18 J
• 36 J
• 12 J
• 6 J

Tags

NGSS.MS-PS3-1

Which point has the most potential energy?

• G

• F

• B

• A

Tags

NGSS.MS-PS3-2

Calculate the amount of work done if you use a 100N force to push a 50 kg box 5 m across the kitchen floor. 

• 250 J 
• 500 J
• 5000 J
• 50,000 J

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Which two factors affect the gravitational attraction between two objects?

• Density and Friction
• Mass and Distance
• Density and Distance
• Mass and Friction

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If you use a crowbar to get the lid off of a bucket, what simple machine are you using?

• Inclined Plane
• Pulley
• Wheel and Axle
• Lever