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Balanced, Unbalanced, And Net Forces
Test Description: Review questions
Instructions: Answer all questions to get your test result.
1) A force can be best defined as:
A
gravity or friction
B
change in velocity over change in time.
C
something that is exerted
D
a push or a pull
2) Which of the following is an example of a net force?
A
A 10 kg box of books has intertia
B
Friction pushes against an object, slowing it down.
C
A car travels at a constant velocity of 10 m/s
D
A car in motion will tend to stay in motion, while a car at rest will tend to stay at rest.
3) 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?
A
The tree was stationary and began to move.
B
The tree was already in motion and sped up.
C
The tree was already in motion and changed direction.
D
The tree had momentum.
4) In which situation does the motion of an animal show that a net force is acting on that animal?
A
A running tiger increases its speed from 4 m/s to 6 m/s.
B
An eagle remains flying at a constant velocity.
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.
5) 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 acceleration.
B
Any one force that acts on an object will equal the mass of the object multiplied by its velocity.
C
The net force 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
6) Choose the best ending. If an object is traveling with a constant velocity...
A
There is no net force on the object.
B
There are no forces 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.
7) 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 downwards.
C
There is a net force on the object to the right.
D
There is a net force on the object to the left.
8) 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 are no forces acting on the red team.
B
There is no net force on the red team.
C
The blue team is stronger (has a greater pulling force) than the red team.
D
The red teach is stronger (has a greater pulling force) than the blue team.
9) 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
Gravity pulling down on the vase and the force of the table pushing up on the vase are equal.
C
There are net forces on the vase.
D
The force of gravity pulls the vase downwards.
10) 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
35 N forwards
B
35 N backwards
C
5 N forwards
D
5 N backwards
*select an answer for all questions
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