Forces and Motion Conceptual Bell Ringer

Which of the following is true about balanced forces?

• They cause objects to change direction.

• They always make objects speed up.

• They cancel each other out and do not cause motion.

• They cause objects to slow down.

A force of 10 N pushes to the right, and another force of 10 N pushes to the left. What is the net force?

• 20 N right

• 20 N left

• 0 N

• 10 N right

What happens when unbalanced forces act on an object?

• The object stays at rest.

• The object moves at a constant speed.

• The object changes motion (speed or direction).

• The object disappears.

Two people push a box in the same direction with forces of 15 N and 20 N. What is the net force?

• 5 N

• 20 N

• 35 N

• 0 N

If a car is moving at a constant speed, what can you infer about the forces acting on it?

• They are balanced.

• They are unbalanced.

• No forces are acting on the car.

• Only gravity is affecting the car.

A book is resting on a table. Which forces are acting on the book?

• Only gravity

• Gravity and an upward force from the table

• No forces

• Only friction

A person pulls a rope with 50 N to the right, while another pulls with 30 N to the left. What is the net force?

• 80 N left

• 80 N right

• 20 N right

• 20 N left

A skydiver is falling at a constant speed with air resistance equal to gravity. What can you conclude?

• The forces are balanced.

• The forces are unbalanced.

• Gravity is stronger than air resistance.

• Air resistance is stronger than gravity.

A box is being pushed to the right with 40 N while friction pushes to the left with 10 N. What will happen?

• The box will move left.

• The box will move right with a net force of 30 N.

• The box will not move.

• The box will move right with a net force of 50 N.

A soccer ball is kicked and rolls to a stop. Why does it stop?

• No forces acted on it.

• It ran out of force.

• Friction acted as an unbalanced force to slow it down.

• Gravity made it stop.