Forces and Newton's Laws Final Review

What is Newton's first law of motion?

• An object in motion will slow down and eventually stop on its own

• An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

• An object at rest will start moving on its own

• An object in motion will change direction without any external force

Give an example of an object at rest and an object in motion, and explain how Newton's first law applies to each.

• An example of an object at rest is a book on a table, and an example of an object in motion is a swinging pendulum. The book will remain at rest until a force is applied to move it, and the pendulum will continue swinging unless a force is applied to stop it.

• An example of an object at rest is a tree, and an example of an object in motion is a flying bird. The tree will remain at rest until a force is applied to move it, and the bird will continue flying unless a force is applied to stop it.

• An example of an object at rest is a parked car, and an example of an object in motion is a moving train. The car will remain at rest until a force is applied to move it, and the train will continue moving at a constant speed unless a force is applied to stop it.

• An example of an object at rest is a sleeping person, and an example of an object in motion is a rolling ball. The person will remain at rest until a force is applied to wake them up, and the ball will continue rolling unless a force is applied to stop it.

State Newton's second law of motion and provide the formula associated with it.

• F = m/a

• F = mv

• F = ma

• F = m^2a

If the force acting on an object is doubled, what happens to the object's acceleration according to Newton's second law?

• The object's acceleration will become zero.

• The object's acceleration will double.

• The object's acceleration will stay the same.

• The object's acceleration will become negative.

Explain the concept of balanced forces and provide an example.

• A rocket launching into space

• A book resting on a table

• A car accelerating at a constant speed

• An example of balanced forces is a person pushing a box with the same force that another person is pulling it in the opposite direction, causing the box to remain stationary.

What is an unbalanced force, and how does it affect an object's motion?

• An unbalanced force causes an object to remain at rest

• An unbalanced force affects an object's motion by causing it to accelerate or change its speed or direction.

• An unbalanced force has no effect on an object's motion

• An unbalanced force only affects an object's color

State Newton's third law of motion and provide an example to illustrate it.

• Example: When a person walks, they push back on the ground with their foot. The ground then pushes forward on the person, propelling them forward.

• When a person walks, they push back on the ground with their foot. The ground then pulls them backward.

• When a person walks, they push back on the ground with their foot. The ground then pushes them sideways.

• When a person walks, they push back on the ground with their foot. The ground then pushes them downward.

If a person pushes against a wall with a force of 100N, what is the reaction force exerted by the wall according to Newton's third law?

• 100N

• 200N

• 50N

• 0N

How are action and reaction forces related according to Newton's third law?

• Action and reaction forces are parallel to each other.

• Action and reaction forces cancel each other out.

• Action force is greater than reaction force.

• Action and reaction forces are equal in magnitude and opposite in direction.

Explain how Newton's laws of motion are related to everyday experiences and provide two examples.

• Newton's laws of motion are only applicable to scientific experiments, not everyday situations

• For example, Newton's first law of motion (inertia) can be seen when a car comes to a stop and the passengers continue to move forward. Newton's second law (force equals mass times acceleration) is evident when kicking a soccer ball, as the force applied determines the acceleration of the ball.

• Newton's first law is about gravity and has no relevance to everyday experiences

• Newton's second law only applies to objects in space, not in everyday life