Force and Motion Review

Which of these would NOT change the velocity of an object?

• The object speeding up as more force is applied.

• The object slowing down as it is going up a hill.

• The object maintaining constant speed and direction.

• The object turning right.

Which is the force that acts whenever two surfaces or objects move past one another that can slow an object down because of its push in the opposite direction?

• gravity

• friction

• velocity

• opposite

Which of the following will definitely cause a change in the velocity of a parked car?

• The car experiences an unbalanced force.

• 
  All forces acting on the car increase by 1 N.

• All forces acting on the car decrease by 1 N.

• The forces acting on the car are equal and balanced.

Tags

NGSS.MS-PS2-2

At dinner, Hans passed the salt shaker to his sister Jessica by sliding it across the wooden table.  The salt shaker gradually slowed down and stopped after moving 12 centimeters.

Why did the salt shaker stop moving?

• The salt shaker ran out of force.

• 
  The table exerts a force that is opposite to the salt shaker's motion.

• The table absorbs force from the salt shaker.

• All objects stop moving because their natural state is to be still.

Tags

NGSS.MS-PS2-2

A student makes a balloon cart to investigate how combined forces create motion.  The student create a simple cart by attaching wheels to a small piece of cardboard.  The student attaches a straw with a balloon on one end so that any air coming out of the balloon flows in one direction.

The student blows up the balloon, sets the cart on the tabletop, and lets go. Air flows out of the balloon and through the straw, but the cart does not move.  

Which of these explains why the car does not move?

• The force of gravity exceeds the other forces acting on the cart.

• The forces pushing the cart forward were greater than the force of mass and gravity.

• The force on the cart from the air in the balloon and the friction on the ties is balanced.

• The cart experiences an unbalanced force from the air in the balloon and the friction on the tires.

Tags

NGSS.MS-PS2-2

Stability vs. Change:  Select 5 actions that would CHANGE the motion of an object.  (Not changing = stability)

• start moving and stop moving

• speed up and slow down

• remains at rest

• change direction (turn or go in a circle)

• remain at a constant speed in a straight line

In soccer, players kick a soccer ball across a flat field.  At practice one day, three soccer balls that have the same mass were rolling across the field.  They were each kicked by a soccer player, but not from the same direction.  Each soccer ball changed speed as a result of being kicked.  Use the information in the diagram to answer the question.

Which soccer ball(s) experienced the strongest force when it was kicked?  How do you know?

• The purple soccer ball because it has the fastest ending speed.

• The blue soccer ball because it takes a stronger force to slow something down than to speed something up.

• The blue soccer ball because it changed speed the most.

• The purple and yellow soccer balls because they gained force, while the blue soccer ball lost force.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Juno, Melissa, and Anna have skateboards that are the same mass.  They were playing with their skateboards on a flat street when another skateboard came along and bumped their skateboards, but not from the same direction.  Each skateboard changed speed as a result of being bumped.  us the information in the diagram to answer the question.
Use the information in the passage and diagram to answer the question.

Which skateboard(s) experienced the strongest force when bumped?  How do you know?

• The green skateboard experienced the strongest force because it changed speed the most.

• The green skateboard experienced the strongest force because it takes up a stronger force to slow something down than it takes to speed something up.

• The red and brown skateboards experienced the same strength force because they both gained force, but the green skateboard lost force.

• The red skateboard experienced the strongest force because it has the fastest ending speed.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Juan's dog Rolo likes to pull him on his skateboard in the neighborhood after school.  Juan would like to design an investigation to calculate the difference in the amount of force needed for the dog to pull him on the skateboard.

What factors must Juan consider in his plan to ensure he can accurately demonstrate the relationship between force and mass?  

Select three correct answers.

• Juan must consider how he will measure force exerted by he and his brother on the skateboard.

• Juan must consider how he will control his and his brother's masses to ensure they are equal.

• Juan most be able to calculate the force the dog must exert to overcome the mass of Juan and the skateboard.

• Juan must consider the surface that the skateboard rolls over to control friction for each trial.

• Juan must consider how he will ensure constant speed of the skateboard for each trial.

Tags

NGSS.MS-PS2-2

Hannah just finished building a house of cards that stands four stories high.  She is worried that it will fall down.

Which of the following statements is definitely true?

• 
  As long as nobody touches the house of cards, it will remain standing.

• 
  A house of cards is too fragile and must fall down eventually.

• If no unbalanced force acts upon the house of cards, then it will remain standing forever.

• If Hannah adds another card to the house of cards, then it will fall down.

Tags

NGSS.MS-PS2-2