Unit 2: Lesson 2 and 3

A book is resting on a table. What kind of forces must be acting on the book?

• A. the book must not have any forces acting on it

• B. the force acting on the book is a strong force

• C. the forces acting on the book must be balanced

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What happens when two forces push or pull on an object in the same direction?

• A. they cancel each other out completely

• B. they become a stronger force in that direction

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There are six children a game of tug-of-war split into two equal teams. At first the rope does not move. Are the forces balanced or unbalanced?

• A. balanced

• B. unbalanced

• C. there is no force

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The force that pulls down is called ___________.

• A. balance

• B. dynamometer

• C.unbalanced

• D. gravity

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True or False. The object will stay still when an object has unbalanced forces acting on it.

• A. True

• B. False

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True or False. Scientists use a spring scale to measure force?

• A. False

• B. True

In this photo the apple is not moving, which BEST describes the force or forces acting on the apple?

• A. the forces of gravity is pushing upward on the apple, and it is balanced

• B. the forces of the hand and gravity on the apple are unbalanced

• C. the forces of the hand and gravity on the apple are balanced

• D. the force of the hand is pushing downward on the apple, and it is unbalanced

True or False. Balanced forces cause a change in motion?

• A. True

• B. False

If you kick a soccer ball forward, what kind of motion will it move in?

• A. back-and-forth motion

• B. circular motion

• C. motion in line

• D. all of the above

Team A and B are playing tug-of-war. All of the players are pulling with equal force EXCEPT for one player on Team A who is not pulling at all. Who will win the game?

• A. Team A, because the forces are balanced and they are pulling with greater strength

• B. Team B, because the forces are unbalanced and they are puling with greater strength

• C. Team B, because the forces are balanced and they are pulling with greater strength

• D. Team A, because the forces are unbalanced and they are pulling with greater strength

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