Balanced & Unbalanced Forces

Which of the following objects will experience an unbalanced force?

• A bike rider on a smooth and level road, pedaling at a constant rate

• A chair sitting on the floor with balanced forces acting in opposite directions

• A train pulling another train, each with the same amount of force

• A ball rolling across the floor with friction acting in the opposite direction

Tags

NGSS.MS-PS2-2

Why does a book on a table not move?

• No forces are acting on the book

• Forces of the table pushing up and gravity pulling down are balanced

• Gravity is the only force acting on the book

Tags

NGSS.MS-PS2-2

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

Are forces balanced or unbalanced when a marble rolls down a ramp?

• Balanced

• Unbalanced

Tags

NGSS.MS-PS2-2

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

• Balanced

• Unbalanced

Tags

NGSS.MS-PS2-2

Are forces balanced or unbalanced when skateboarding down a ramp?

• Balanced

• Unbalanced

Tags

NGSS.MS-PS2-2

At A the speed of the ball increases. At B, speed decreases. At C, speed is constant. Which points does the ball experience unbalanced forces?

• A and B

• A and C

• B and C

• A, B, and C

Tags

NGSS.MS-PS2-2

Balanced forces can cause--

• an object to speed up or slow down

• an object to stay still or move at a constant speed and direction

Tags

NGSS.MS-PS2-2

Are the forces acting on the sled in Section 1 balanced or unbalanced? The track is smooth and frictionless.

• Balanced

• Unbalanced

Tags

NGSS.MS-PS2-2

Are the forces acting on the sled in Section 2 balanced or unbalanced? The track is smooth and frictionless.

• Balanced

• Unbalanced

Tags

NGSS.MS-PS2-2