Milestones 4

Shaina uses a shovel to dig a hole to plant a tree. A shovel is an example of a compound machine because it is made up of what two simple machines?

• Wheel and axle and lever
• Lever and wedge
• Screw and wedge
• Inclined plane and wedge

On Earth, an astronaut has a mass of 140 kg. When the astronaut goes into space, she

• will have a mass of 140 kg, but will have less weight. 
• will have less mass and weight. 
• will have a mass of 140 kg, and have a weight of 140 kg. 
• will have less mass and a weight of 140 kg. 

Which explains why a person using a ramp can load heavy boxes onto a truck more easily than a person can using only human strength? 

• The person using a ramp needs less force. 
• The person using human strength needs less force.
• The ramp reduces the weight of the boxes.
• Friction makes it harder to lift boxes without a ramp

Which is true about the relationship between an object’s mass and its weight? 

• The object’s mass is caused by the weight of the object pushing downward. 
• Weight is gravity’s force on the object, which is determined by its mass. 
• An object’s weight and its mass are the same, but they are measured differently. 
• An object’s weight and its mass are independent of each other. 

This graph shows the velocity of the car. Which statement BEST explains how the car is moving? 

• Velocity is increasing, so the car is accelerating. 
• Velocity is decreasing, so the car is accelerating. 
• Velocity is increasing, so the car is not accelerating. 
• Velocity is decreasing, so the car is not accelerating. 

A circuit contains four light bulbs. One light bulb goes out, but the other three stay lit. This must be a(n) ___ circuit. 

• open
• series
• parallel
• resistant

Which of the following is a true statement about the magnetic field between two magnets?  

• The south pole of one magnet is attracted to the south pole of the other magnet.  
• The south pole of one magnet is attracted to the north pole of the other magnet.  
• The north pole of one magnet is attracted to the north pole of the other magnet
• The south pole of one magnet is attracted to the both poles of the other 
  

Look at the circuit. What essential part of an electric circuit is missing at position X? 

• Load
• Switch
• Wires
• Energy source

Which is a result of the effect of gravity? 

• Rocket engines can force objects into space. 
• Air friction causes falling objects to slow down. 
• Released objects always fall toward Earth’s surface. 
• Airplanes are able to fly without falling to the ground.

Jeff was riding in a car. Which change demonstrates the GREATEST effect of inertia?

• The car makes a sudden stop. 
• The car slows down gradually. 
• The car changes into another lane. 
• The car runs out of gas and rolls to a stop.