Science Chapter 2 Review

Besides a strength, or magnitude, what does every force have?

• gravity
• direction
• friction

A ball is rolled across four different surfaces with the same force. Which surface will slow the movement of the ball the most?

• tile floor
• paved road
• grassy field
• on ice

How do electric and magnetic forces act on different objects?

• They either push or pull objects.
• They only push or pull objects when they touch each other.

How do electric and magnetic forces act on different objects?

• They either push or pull objects.
• They only push or pull objects when they touch each other.

What happens when an object accelerates?

• Its speed or direction changes.
• Only its speed changes.
• Only its direction changes.
• It goes crazy in circles.

When you ride a roller coaster, what makes your body rise out of its seat at the top of a hill?

• inertia
• gravity
• friction
• electricity

How can you complete this sentence so it is always true?The greater the net force acting on an object,

• the greater the acceleration of the object.
• the lesser the acceleration of the object.

Which statement is true of all simple machines?

• They reduce the amount of work.
• They change the distance of a force.
• They change the amount required or direction of a force.
• They are awesome!

When you raise or lower a flag on a flagpole, you are using a simple machine called a 

• lever
• pulley
• inclined plane
• pull it yourself!

What happens if balanced forces are applied to a moving object?

• The object stops moving.
• The object moves faster in the same direction.
• The object keeps moving at the same speed and direction.