# Balanced, Unbalanced, And Net Forces: Question Preview (ID: 8061)

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A force can be best defined as:
a) a push or a pull
b) gravity or friction
c) something that is exerted
d) change in velocity over change in time.

Which of the following is an example of a net force?
a) A 10 kg box of books has intertia
b) A car travels at a constant velocity of 10 m/s
c) Friction pushes against an object, slowing it down.
d) A car in motion will tend to stay in motion, while a car at rest will tend to stay at rest.

A tree is standing still. The wind begins to blow and the tree bends. Which statement best explains how you could tell that a net force was acting on the tree?
b) The tree was stationary and began to move.
c) The tree was already in motion and sped up.
d) The tree was already in motion and changed direction.

In which situation does the motion of an animal show that a net force is acting on that animal?
a) An eagle remains flying at a constant velocity.
b) A running tiger increases its speed from 4 m/s to 6 m/s.
c) A sparrow remains stationary perched on a power line.
d) At 0s, a snake slithers forward with a velocity of 2 m/s. 5 s later the snake's velocity is 2 m/s.

Which of the following statement best states Newton's second law?
a) The net force on an object will equal the mass of the object multiplied by its velocity.
b) The net force on an object will equal the mass of the object multiplied by its acceleration.
c) Any one force that acts on an object will equal the mass of the object multiplied by its velocity.
d) Any one force that acts on an object will equal the mass of the object multiplied by its acceleratio

Choose the best ending. If an object is traveling with a constant velocity...
a) There are no forces on the object.
b) There is no net force on the object.
c) There are no forces parallel to the direction of motion.
d) There are only forces parallel to the direction of motion.

You see an object accelerate towards the left. Which of the following statements is correct?
a) There is a net force on the object upwards.
b) There is a net force on the object to the left.
c) There is a net force on the object to the right.
d) There is a net force on the object downwards.

You observe two teams in a tug-of-war. The red team is moving towards the blue team with a constant velocity. Which of the following statements must be true?
a) There is no net force on the red team.
b) There are no forces acting on the red team.
c) The red teach is stronger (has a greater pulling force) than the blue team.
d) The blue team is stronger (has a greater pulling force) than the red team.

A vase of flowers is stationary on a table. Which of the following statements best explains why the vase is stationary?
a) There are no forces on the vase.
b) There are net forces on the vase.
c) The force of gravity pulls the vase downwards.
d) Gravity pulling down on the vase and the force of the table pushing up on the vase are equal.

What is the net force on a car if the force of friction is 15 N and the forward force due to the engine is 20 N?
a) 5 N backwards
b) 5 N forwards
c) 35 N backwards
d) 35 N forwards

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