Topic 1, Lesson 4 - Balanced and Unbalanced Forces

A ______________ is two equal forces acting on an object.

• contact force

• net force

• balanced force

• friction

A(n)______________ are the total forces acting on a object.

• contact force

• unbalanced force

• balanced force

• net force

What is an equation?

• 1. a method of calculating the area of a circle using only whole numbers

• a math problem that shows two equal amounts

• a geometric shape that has four equal sides and angles

• a set of instructions for solving a math problem without any variables

Emma conducts an investigation. She uses the same object during her investigation. She puts her observations in a table.

Based on the evidence, which two conclusions can Emma make? Choose TWO.

• A. It is best to have only one trial in an investigation.

• B. A strong force will put the object in motion.

• C. Sometimes the forces on the object are unbalanced when a weak or strong force is used.

• D. The net force on the object is always 0 when a force is put on the object.

Look at the picture. Describe the net force on the ball.

• The net force is 0 because the forces on the ball are balanced.

• The net force is 1 because there is one force on the ball.

• The net force is 0 because there are no forces on the ball.

• The net force is 1 because the forces on the ball are balanced.

Fill in a word that best completes the sentence. Look at the picture of two spring scales measuring force.

The scale with a rock shows a ______________ force than the scale with the apple.

What is the place on the diagram of the ball's path that causes force to overcome gravity?

• 1st

• 2nd

• 3rd

• 4th

When Caden is throwing the ball, are the forces balanced or imbalanced? How do you know?

• The forces are unbalanced because the ball moves down.

• The forces are balanced because the ball moves down.

• The forces are unbalanced because the ball moves up.

• The forces are balanced because the ball moves up.

Choose which place on the diagram of the ball's path where the forces on the ball can be shown using these force arrows. Think of what gravity does afterwards.

• 4th

• 3rd

• 2nd

• 1st

A box is resting on a table. Gravity pulls the box downward with a force of 150 N. With how much force is the table pushing upward on the box?