Energy, Force, and Simple Machines

 Alesia is taking an all­ day ride on her bicycle. The graph shows how far she is from home at different times during her ride.  During which time period is Alesia moving fastest?

• 0–1 hours 
• 3–4 hours 
• 4–5 hours
• 6–7 hours 

Tags

NGSS.MS-PS3-1

Kilometers per hour (kph) is a unit that describes which of the following?

• velocity
• direction
• position
• speed

Tags

NGSS.MS-PS3-1

When an object's distance from another object is changing, the object is .... 

• under pressure.
•  in motion
• not moving.
• changing reference point.

Tags

NGSS.MS-PS3-2

An airplane travels at 50 meters in 2 seconds. What is its average speed? 

• 25 miles per hour
• 100 miles per hour
• 25 meters per second
• 100 meters per second

When a bird flies, its wings push air downward. As a result the air pushes back upward on the bird. Which law of motion most applies to the way the wings of a bird beat? 

• Every action has an equal and opposite reaction
• The rate of acceleration of an object depends on the amount of force applied.
• Objects in motion tend to remain in motion until acted upon by an another force. 
• Force is defined by mass times acceleration

What happens when two forces act in the same direction?

• They cancel each other out.
• The stronger one prevails.
• Their strengths are added.
• Their sum divided by the two is the total force.

Tags

NGSS.HS-PS2-1

What does this graph represent?

• Constant speed
• Acceleration
• Not moving

During which interval is the object speeding up?

• A to B
• B to C
• D to E
• E to F

Tags

CCSS.8.EE.B.5

What is this graph showing?

• Constant Speed
• Acceleration (speeding up)
• Deceleration (slowing down)
• No motion

Tags

NGSS.MS-PS3-1

Why is it harder for the boy in Image B to get down the hill?

• Motion
• Friction
• Work
• Displacement

Tags

NGSS.MS-PS2-2