Understanding Forces and Motion

What is the difference between balanced and unbalanced forces?

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NGSS.MS-PS2-2

Which of the following scenarios best illustrates balanced forces acting on an object?

• A book resting on a table.

• A car accelerating on a highway.

• A ball rolling down a hill.

• A kite flying in the wind.

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DOK Level 2: Skill/Concept

A toy car is pushed with a force of 5 N to the right and 5 N to the left. What will be the motion of the toy car?

• The toy car will move to the right.

• The toy car will move to the left.

• The toy car will not move.

• The toy car will move in a circular path.

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DOK Level 2: Skill/Concept

A child pushes a swing with a force of 10 N, and the swing moves forward. What type of force is acting on the swing?

• Balanced force

• Unbalanced force

• Gravitational force

• Magnetic force

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DOK Level 2: Skill/Concept

Explain how unbalanced forces can change the motion of an object using the example of a soccer ball being kicked.

• The ball remains stationary because forces are balanced.

• The ball moves in the direction of the stronger force, which is the kick.

• The ball moves in the opposite direction of the kick.

• The ball moves in a circular path due to balanced forces.

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DOK Level 3: Strategic Thinking

A box is being pushed across the floor with a force of 20 N to the right and a frictional force of 15 N to the left. What is the net force acting on the box, and in which direction will it move?

• 5 N to the right

• 5 N to the left

• 35 N to the right

• 35 N to the left

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DOK Level 3: Strategic Thinking

Which of the following is an example of an unbalanced force causing a change in motion?

• A book lying on a shelf.

• A car parked on a driveway.

• A person pushing a stalled car.

• A picture hanging on a wall.

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DOK Level 2: Skill/Concept

Describe the effect of balanced forces on the motion of an object using the example of a tug-of-war game where both teams are equally strong.

• The rope moves towards the stronger team.

• The rope remains stationary.

• The rope moves in a circular path.

• The rope moves back and forth.

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DOK Level 3: Strategic Thinking

A skateboarder is moving at a constant speed on a flat surface. What can be said about the forces acting on the skateboarder?

• The forces are balanced.

• The forces are unbalanced.

• There are no forces acting on the skateboarder.

• Only gravitational force is acting on the skateboarder.

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DOK Level 2: Skill/Concept

A car is traveling at a constant speed on a straight road. What does this indicate about the forces acting on the car?

• The forces are unbalanced, causing acceleration.

• The forces are balanced, resulting in no change in motion.

• There are no forces acting on the car.

• Only frictional force is acting on the car.

Tags

DOK Level 3: Strategic Thinking