Forces and Motion Review

What is a balanced force?

• A balanced force is a force that is equal in magnitude and direction to another force, resulting in a net force of zero.

• A balanced force is a force that is equal in magnitude and opposite in direction to another force, resulting in a net force of zero.

• A balanced force is a force that is equal in magnitude and opposite in direction to another force, resulting in a net force of one.

• A balanced force is a force that is equal in magnitude and opposite in direction to another force, resulting in a net force of two.

Give an example of a balanced force.

• Two people pulling a box with the same amount of force in the same direction.

• A person pushing a box with a greater force than another person pushing in the opposite direction.

• A person pushing a box with a smaller force than another person pushing in the opposite direction.

• Two people pushing a box with the same amount of force in opposite directions.

What is an unbalanced force?

• A force that only affects the shape of an object, but not its motion.

• A force that does not cause any change in an object's motion or shape.

• A force that causes a change in an object's motion or shape.

• A force that causes an object to move in a straight line without any change in its shape.

Tags

NGSS.MS-PS2-2

Give an example of an unbalanced force.

• A person pushing a heavy object and it starts moving.

• A person pushing a light object and it starts moving in the opposite direction.

• A person pushing a heavy object and it doesn't move.

• A person pulling a light object and it doesn't move.

Tags

NGSS.MS-PS2-2

How do you identify if forces are balanced or unbalanced?

• By looking at the color of the object.

• By measuring the temperature of the object.

• By counting the number of forces acting on the object.

• By comparing the magnitudes and directions of all the forces acting on an object.

Tags

NGSS.3-PS2-1

How does friction affect motion?

• Friction increases motion.

• Friction accelerates motion.

• Friction opposes motion.

• Friction has no effect on motion.

Tags

NGSS.MS-PS2-2

What is the difference between balanced and unbalanced forces?

• Balanced forces have equal magnitudes and opposite directions, while unbalanced forces have unequal magnitudes and/or the same direction.

• Balanced forces have unequal magnitudes and opposite directions, while unbalanced forces have equal magnitudes and/or the same direction.

• Balanced forces have equal magnitudes and the same direction, while unbalanced forces have unequal magnitudes and/or opposite directions.

• Balanced forces have unequal magnitudes and the same direction, while unbalanced forces have equal magnitudes and/or opposite directions.

What is the effect of balanced forces on an object?

• Balanced forces cause an object to accelerate.

• Balanced forces cause an object to decelerate.

• Balanced forces cause an object to remain at rest.

• Balanced forces cause an object to change direction.

The 5th graders were playing a game of tug-of-war.  The class was divided equally with half the class on one side of the rope and the other half on the opposite side.  For 5 minutes the students pulled and pulled but neither side could pull the flag to one side or the other.  Choose the description of the forces during the 5th grade tug-of-war.

• The forces were unbalanced in the game.
• The forces were friction, gravity, and chemical energy.
• The students all had the same amount of strength.
• The forces were balanced in the game.

Tags

NGSS.3-PS2-1

Molly is watching a wind-up toy walking across a table. She observes that the toy covers 1 cm every second for 10 seconds. Which graph do you think most closely represents the toy's  journey across the table?

• A
• B
• C
• D

Tags

NGSS.MS-PS3-1