___________ forces always cause an object's motion to change.

• balanced

• unbalanced

• contact

• non-contact

______________ is a force that always acts in the direction opposite of motion.

• applied

• friction

• gravity

• normal

You are pulled to the surface of the earth due to the force of _________________

• gravity

• friction

• normal force

• contact force

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

The force that resists sliding between two touching objects is called _____________________

• normal force

• contact force

• non-contact force

• friction

When there is no net force acting on an object, the forces are considered ___________________

• balanced

• unbalanced

• contact'

• non-contact

What is the direction of the net force in this picture?

• left

• right

Are forces balanced or unbalanced when a car is moving at a constant speed in a straight line?

• Balanced
• Unbalanced

Tags

NGSS.MS-PS2-2

What is air resistance?

• friction in the air that slows things down
• when an airplane flies into a cloud
• when you feel the air hitting your face

Tags

NGSS.MS-PS2-2

What kind of surface is a gravel and rocks?

• smooth
• rough

What kind of surface is a bowling alley? 

• smooth
• rough