Grade 9 Science: Free Body Diagrams
A worksheet for Grade 9 Science students to practice drawing and analyzing free body diagrams, understanding forces acting on objects.
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Free Body Diagrams Worksheet
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Read each question carefully and follow the instructions to draw or analyze free body diagrams. Remember to label all forces clearly.
1. Which of the following best describes the purpose of a free body diagram?
To show the internal structure of an object.
To illustrate all the forces acting on an object.
To demonstrate the object's motion path.
To calculate the object's volume.
2. When an object is at rest on a horizontal surface, what is the relationship between the normal force and the force of gravity?
Normal force is greater than the force of gravity.
Normal force is less than the force of gravity.
Normal force is equal in magnitude and opposite in direction to the force of gravity.
Normal force is irrelevant.
3. A free body diagram simplifies an object into a and represents all forces acting on it as .
4. The force of friction always acts in the direction of motion or intended motion.
5. According to Newton's First Law, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an force.
6. Draw a free body diagram for a book resting on a table. Label all forces.
7. Draw a free body diagram for a car accelerating forward on a flat road. Label all forces.
8. Air resistance is a type of contact force.
True
False
9. In a free body diagram, the length of an arrow represents the magnitude of the force.
True
False
Match each force with its description:
10. Force of Gravity
a. Resists motion between surfaces in contact
11. Normal Force
b. Force exerted by a surface perpendicular to the surface of contact
12. Applied Force
c. Force acting on an object due to Earth's gravitational pull
13. Frictional Force
d. A push or pull on an object