Identifying forces

Multiple Choice

Two people pull in opposite directions, but neither move positions (see picture). Which of the following BEST describes the forces being applied in this situation?

• The forces are balanced, and the net force is positive.

• The forces are balanced, and the net force is zero.

• The forces are unbalanced, and the person on the left applies a greater force.

• The forces are unbalanced, and the person on the right applies a greater force.

Multiple Choice

Which of the following examples does NOT represent an object with an unbalanced force?

• A rock falling down a hill

• A football being thrown into the air

• A bicycle sitting on a sidewalk

• A water balloon being launched

Multiple Choice

Which blocks will move as a result of the forces shown in the diagram?

• Blocks A and C

• Blocks A, B, and C

• Blocks A and B

• Blocks B and C

Multiple Choice

Mrs. Halleran is giving examples of balanced and unbalanced forces. Which of the following situations is an example of unbalanced forces acting upon an object?

• A hose being pulled from both sides with equal force.

• A truck moving at a constant speed of 45 miles per hour.

• A toy car accelerating as it rolls down a ramp.

• A backpack lying on the ground.

Multiple Choice

Luis is observing a game of Tug-of War. The center of the rope will move when which of the following is true?

• The rope essentially has no mass of its own.

• A player is added to the team on the right.

• One team applies a greater force than the other team.

• There is no friction between the ground and the players.

Multiple Choice

What is a force?

• A special power that surrounds us

• The amount of strength it takes to move an object

• A push or pull on an object whether directly or indirectly

• The mass of an object being pulled towards the earth

Open Ended

What do you think is the reason that the paper falls faster when it is crumpled than when it is flat?

Open Ended

What unit is used to measure force?

Open Ended

If I drop a hammer and a feather on the moon they will fall at the same rate. Why is it that the same thing does not happen on earth, what is the difference?

Multiple Choice

Gravity will pull harder on objects that have more ______

• Volume

• Newtons

• Height

• Mass

Multiple Choice

Friction is a force that works ________.

• Against motion

• With motion

• Against gravity

• Against mass

Multiple Choice

Rougher surfaces have ...

• greater friction
• less friction
• the same level of friction

Multiple Choice

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed
• less friction doesn't affect speed

Multiple Choice

How many poles do all magnets have?

• One

• Two

• Three

• Four

Multiple Choice

What happens when the north pole of one magnet is brought close to the south pole of another magnet?

• They repel each other

• Nothing happens

• They attract each other

• They become demagnetized

Multiple Choice

What happens when like poles of magnets are aligned?

• They attract

• They do nothing

• They repel

• They become neutral

Multiple Choice

Maria roller skates to the top of a hill and then starts rolling downward. What are the MAIN forces affecting Maria’s motion as she rolls down the hill?

• gravity and magnetism

• speed and friction

• friction and gravity

• push and pull

Multiple Choice

Ricardo is conducting an experiment to see how far a rubber ball will roll when he releases it at the top of an inclined plane.   Why does the ball speed up as it travels down the inclined plane?

• The force of gravity pulls the ball down the inclined plane.

• The force of friction is reduced because the ball is rubber.

• The ball has less magnetic attraction to the plane as it travels.

• The ball has a greater mass as it travels faster.

Multiple Choice

What is the definition of balanced forces?

• Two forces acting in opposite directions on an object, and they are not equal in size.

• Two forces acting in the same direction on an object, and they are equal in size.

• Two forces acting in opposite directions on an object, and one is larger than the other.

• Two forces acting in opposite directions on an object, and they are equal in size.

Multiple Choice

How can you explain balanced forces using an example?

• Balanced forces can be explained using the example of a book resting on a table. The force of gravity pulling the book downward is balanced by the upward force from the table, resulting in no motion.

• Balanced forces can be explained using the example of a car accelerating on a highway.

• Balanced forces can be explained using the example of a rocket launching into space.

• Balanced forces can be explained using the example of a ball rolling down a hill.

Multiple Choice

What is the definition of unbalanced forces?

• Forces that are equal in size and opposite in direction

• Forces that are not equal in size and same in direction

• Forces that are not equal in size and opposite in direction

• Forces that are not equal in size and random in direction

Multiple Choice

Can you provide an example of unbalanced forces?

• A book sitting on a table

• A car accelerating forward while the brakes are applied

• A person standing still

• A car moving at a constant speed

Multiple Choice

What conclusion can be made with the diagram?

• An example of balanced forces

• An example of unbalanced forces

• The bigger person with the red shirt will win

• The person with the green shirt will in the tug of war

Multiple Choice

What is the Net Force acting on the box in this picture?

• 10 N to the Left

• 10 N to the Right

• 60 N to the Left

• 60 N to the Right

Multiple Choice

What is the Net Force acting on the box in this picture?

• 30 N to the Right

• 30 N to the Left

• 70 N to the Right

• 70 N to the Left