PS Semester Review 21

The things that are kept the same to ensure the results are due to the experiment is called..

• Control
• Constant
• Independent Variable
• Dependent Variable

What is the DEPENDENT variable (effect) in this experiment?

"Does eating breakfast improve test score?"

• eating breakfast or not

• the grade you got on the test

• what time you get up in the morning

• how tasty the breakfast is

What is the INDEPENDENT  variable (cause) is this experiment? 
"Which type of medium is best for plant growth?" 

• height of plant (cm)
• type of medium (soil vs. sand)
• amount of medium
• types of plant

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant
• The amount of sunlight
• The type of music
• The type of liquid

What is the definition of net force?

• a push or a pull that acts on an object

• Net force equal 0N and there is no change in the object's motion

• the overall force acting on an object after all the forces are combined

• The force does not equal 0N, the object accelerates

What is the magnitude and direction of the force in the free body diagram shown?

• 70 N right

• 70 N left

• 50 N right

• 50 N left

Which of the following could cause an acceleration?

• A balance between two forces
• A balance between three forces
• An imbalance between two forces
• Zero forces

Multiplying the mass and acceleration of an object would give you:

• the force of gravity
• the force of friction
• the velocity
• the net force

The air resistance and weight as shown for the skydiver are balanced. The skydiver is probably:

• at rest
• moving at constant velocity
• accelerating upward
• accelerating downward

According to Newton's First Law, an object in motion will tend to:

• stay at rest
• stay in motion
• change in direction
• slow down