# Practice sheet - HW

```AlBashaer International School
American Division
Science Department
Chapter 19 – section 2 – Green level
Section: What is A Force?
NAME: _________________________
DATE: _____________________
Read the words in the box. Read the sentences. Fill in each blank with the word that best
completes the sentence.
motion
force
newton
1. A
pull is a _____________________-________.
2. Any change in _____________________________is caused by a force.
3. The SI unit for force is called a _____________________________.
Circle the letter of the best answer for each question.
4. What does a person sitting on a chair exert on a chair?
a. speed
b. a force
c. direction
d. no force
5. What does a bulldozer exert on a pile of soil?
a. motion
b. no force
c. force
d. velocity
6. What is the force that holds air near Earth’s surface called?
a. net force
b. newton
c. gravity
d. acceleration
push or a
AlBashaer International School
American Division
Science Department
7. What is the combination of all forces acting on an object called?
a. energy
b. net force
c. motion
d. heat
8. How do you find the net force when the two forces act in the same direction?
a. dividing
b. multiplying
c. subtracting
9. How do you find the net force when the forces act in opposite directions?
a. dividing
b. multiplying
c. subtracting
10. How would you find the net force of two dogs pulling in opposite directions?
a. Subtract the smaller force from the larger force.
c. Subtract the larger force from the smaller force.
d. Multiply the forces.
11. What is a combined force that does not cause movement?
a. newton
b. a net force
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American Division
Science Department
c. an unbalanced force
d. a balanced force
12. When forces are balanced, the net force equals how many newtons?
a. 0
c. 2
b. 1
d. 3
13. To make something move, what kind of force(s) do you need?
a. a balanced force
b. an unbalanced force
c. any combination of forces
d. no combination of forces
14. What kind of force causes something to change direction?
a. a balanced force
b. an unbalanced force
c. any combination of forces
d. no combination of forces
15.
AlBashaer International School
American Division
Science Department
17. A boy pulls a wagon with a force of 6 N east as another boy pushes it with a force of 4 N east. What
is the net force?
____________________________________________________________________________________
__________________________________________________________________________
AlBashaer International School
American Division
Science Department
18. Fill in the blank
[Gravity – Friction –newton –force –spring scale]
Term
Definition
It is a push or a pull applied to an object in a direction.
It is the force that opposes motion
It is the attraction force between two objects
The measuring unit for force
The measuring tool for force
18-For each of diagram, determine the net force acting on the object. Follow the format for showing your
work shown in (a). Then, write whether or not there will be a change in motion. If yes, write the direction the
object will move in.
a.
2N
4N
Net force: 4 N – 2 N = 2 N to the left.
Change in motion: The box will move to the left.