8.6A Unbalanced Forces

Which of the following conclusions is based on the data in the table?

• There is no pattern between balanced and unbalanced forces

• Balanced forces are equal and opposite in direction, while unbalanced forces are different sizes in the same or opposite directions

• Forces are always equal and opposite in direction for both balanced and unbalanced forces

• Balanced forces are different sizes in the same or opposite direction, while unbalanced forces are equal and opposite in direction

A car runs out of gas at a rd light, and someone begins to push the car forward with 10 N of force. The force of friction, opposing the forward motion, is 3 N. What happens to the speed and direction of the car?

• The car will move forward with a force of 10 N with a constant speed

• The car will move forward with a force of 7 N with an increasing speed

• The car will move backward with a force of 10 N with an increasing speed

• The car will move backward with a force of 7 N with a constant speed

Tags

NGSS.MS-PS2-2

A student rides his bike tot he park. He experiences an acceleration of 4.5 m/s² during his bicycle ride. If the student and bike have a combined mass of 70 kg, what net force did he experience?

• 15.6 N

• 74.5 N

• 315 N

• Not Here

Tags

NGSS.MS-PS2-2

A surfer is waiting for a wave. A wave comes and pushes the surfer towards the shore. Which statement best describes the motion of the surfer?

• The surfer travels to the left. The speed increases due to net forces of 105 N.

• The surfer travels to the right. The speed increases due to net force of 105 N.

• The surfer travels to the left. The speed is constant due to net force of 105 N.

• The surfer travels to the right. The speed is constant due to net force of 105 N.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A group of students determines how much force it will take to move a 0.1 kg disk. They pull the disk across different surfaces using a spring scale. The results are recorded above. With what acceleration did the disk move across the concrete?

• 23 m/s²

• 33.5 m/s²

• 67 m/s²

• 91 m/s²

Tags

NGSS.MS-PS2-2

Which example does NOT exhibit unbalanced forces?

• → 5 N and → 5 N

• → 5 N and ← 10 N

• → 10 N and ← 10 N

• → 10 N and → 10 N

Tags

NGSS.MS-PS2-2

A pinball machine requires a player to move flippers in order to move a ball. The flipper hits the ball with a force of 50 N. If the pinball, mass of 0.2 kg, moves across the frictionless surface, with what acceleration does the pinball move after the force is applied?

• 250 m/s²

• 10 m/s²

• 0.004 m/s²

• 50 m/s²

Tags

NGSS.MS-PS2-2

Which example does NOT demonstrate an unbalanced force causing a change in speed or direction of an object's motion?

• Kicking a soccer ball

• Picking up a box from the floor

• Pushing a grocery cart

• Relaxing in a recliner

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

According to the picture, what will happen to the motion of the toy truck?

• The toy truck will stay in place

• The toy truck will move left with a force of 16 N

• The toy truck will move right with a force of 4 N

• The toy truck will move right with a force of 16 N

Tags

NGSS.MS-PS2-2

How can the box increase its speed to the right?

• Add a force to the left

• Place the box on a rough surface

• Add a force to the right

• Add a force above the box

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1