Balanced, Unbalanced, and Net Forces

Front

A force can be best described as:

Back

a push or pull

Front

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

Back

Friction pushes against an object, slowing it down.

Front

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?

Back

The tree was stationary and began to move.

Front

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.

Back

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

Front

Which statement best states Newton's second law?

Back

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

Front

If an object is traveling with a constant velocity, choose the best ending:

• 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.

Back

There is no net force on the object.

Front

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.

Back

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

Front

You observe two teams in a tug-of-war. The red team is moving towards the blue team with a constant velocity. Which statement must be true?

Back

There is no net force on the red team.

Front

Why is a vase of flowers stationary on a table?

Back

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

Front

Net force on a car if friction is 15 N and engine force is 20 N?

Back

5 N forwards