Effects of Force

The net force on an object is found by on

• adding the forces.
• dividing the forces.
• subtracting the forces.
• multiplying the forces

The net force of forces 15 N and 30 N is ______.

• 2 N
• 15 N

• 45 N
• 450 N

For forces acting in opposite directions, the net force is found by

• adding the forces.
• dividing the forces.
• subtracting the forces.
• multiplying the forces.

Brakes acting on a train car is an example of

• the net force on an object being positive.
• the net force on an object slowly increasing.
• the net force an object remaining the same over time.
• the net force on an object being equal to one force on the object.

Finding the net force on an object is useful because

• you can predict the direction of an object.
• you can predict the next force that will act on an object.
• it allows you to predict whether an object’s motion will change.
• you can tell how the forces acting on an object have changed over time.

The difference between balanced and unbalanced forces is that

• balanced forces are multiples of 5 N, while unbalanced forces are not.
• balanced forces have a net force equal to 0 N, while unbalanced forces do not.
• balanced forces have a net force unequal to 0 N, while unbalanced forces are equal to 0 N.
• balanced forces have multiple forces that are equal to the same number, while unbalanced forces do not.

Which of the following is NOT a component of Newton’s first law of motion?

• An object at rest stays at rest.
• An object in motion stays in motion.
• An object in motion has a constant velocity unless acted on by a balanced force.
• An object in motion has a constant velocity unless acted on by an unbalanced force.

The net force on an object that is at rest

• is always 0 N.
• changes depending on the location of the object.
• is the result of unbalanced forces acting on the object.
• depends on the balanced forces acting on the object.

What is most likely to happen to a moving object with a net force of 0 N?

• It will likely accelerate.
• It will slowly come to a rest.
• It will come to a complete stop.
• It will continue to move with the same velocity.

What is most likely to happen to a moving object with a net force of 0 N if an unbalanced force acts on it?

• It will likely accelerate.
• It will slowly come to a rest.
• It will come to a complete stop.
• It will continue to move with the same velocity.