Balanced, Unbalanced, and Net Forces

1.

Multiple Choice

5 mins

1 pt

A force can be best described as:

a push or pull

something that is exerted

a change in velocity over change in time

gravity or friction

2.

Multiple Choice

5 mins

1 pt

Which of the following is an example of a net force?

a 10 kg box of books has inertia

a car travels at a constant velocity of 10 m/s

a car in motion will tend to stay in motion, while a car at rest will tend to stay at rest

friction pushes against an object, slowing it down

3.

Multiple Choice

5 mins

1 pt

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?

the tree was already in motion and changed direction

the tree had momentum

the tree was already in motion and sped up

the tree was stationary and began to move

4.

Multiple Choice

5 mins

1 pt

In which situation does the motion of an animal show that a net force is acting on that animal?

At 0 s, a snake slithers forward with a velocity of 2 m/s. 5 s later the snake's velocity is 2 m/s.

An eagle remains flying at a constant velocity.

A sparrow remains stationary perched on a power line.

A running tiger increases its speed from 4 m/s to 6 m/s.

5.

Multiple Choice

5 mins

1 pt

Which of the following statement best states Newton's second law?

The net force on an object will equal the mass of the object multiplied by its velocity.

Any one force that acts on an object will equal the mass of the object multiplied by its acceleration.

Any one force that acts on an object will equal the mass of the object multiplied by its velocity.

The net force on an object will equal the mass of the object multiplied by its acceleration.

6.

Multiple Choice

5 mins

1 pt

Choose the best ending. If an object is traveling with a constant velocity...

There are only forces parallel to the direction of motion.

There is no net force on the object.

There are no forces on the object.

There are no forces parallel to the direction of motion.

7.

Multiple Choice

5 mins

1 pt

You see an object accelerate towards the left. Which of the following statements is correct?

There is a net force on the object to the left.

There is a net force on the object upwards.

There is a net force on the object to the right.

There is a net force on the object downwards.

8.

Multiple Choice

5 mins

1 pt

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?

The red team is stronger (has a greater pulling force) than the blue team.

The blue team is stronger (has a greater pulling force) than the red team.

There are no forces acting on the red team.

There is no net force on the red team.

9.

Multiple Choice

5 mins

1 pt

A vase of flowers is stationary on a table. Which of the following statements best explains why the vase is stationary?

Gravity pulling down on the vase and the force of the table pushing up on the vase are equal.

There are net forces on the vase.

The force of gravity pulls the vase downwards.

There are no forces on the vase.

10.

Multiple Choice

5 mins

1 pt

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?

5 N forwards

5 N backwards

35 N forwards

35 N backwards

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