A pencil falls off of a desk. What moves the pencil toward the floor? 

• mass

• friction

• gravity

• speed

Tags

NGSS.MS-PS2-4

A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is MOST responsible for causing the wagon to stop?

• the mass of the child

• the mass of the wagon

• friction acting on the wagon

• gravity acting on the wagon

Tags

NGSS.MS-PS3-5

A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of her walk than in the second 15 minutes. What can she conclude about her walk?

• she was walking at a constant speed

• she walked in two different directions

• her average speed was faster during the first half of her walk

• she walked over many hills

Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?

• The ball goes up at a constant speed, stops, then comes down at a constant speed

• The ball goes up at a constant speed, stops, and increases speed as it comes down

• The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down

• The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed

Tags

NGSS.MS-PS2-4

What can cause a moving object to increase its speed in a forward direction?

• A force pushing on the object from the opposite direction

• A force that continually acts on the object in the direction the object is moving

• An increase in the mass of the object

• A decrease in the mass of the object

Tags

NGSS.MS-PS2-2

A runner measured the time it took   him to run 5 km.  What can he calculate from

     the distance and time measurements?

    

• force

• speed

• mass

• direction

Tags

NGSS.MS-PS3-1

A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon? 

  

• It would cause the wagon to move faster. 

    

• It would cause the wagon to change mass.

• It would cause the wagon to change direction. 

    

• It would cause the wagon to slow down

Tags

NGSS.MS-PS2-2

Which best explains why a bicycle slows down when its brakes are applied? 

• The brakes heat the rubber on the bicycle

        tires. 

• The brakes add energy to the bicycle. 

• The brakes increase the force of gravity

       on the bicycle. 

• The brakes cause frictional forces on the

        wheels of the bicycle.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?

     

• Ball with a mass of  5 kg

• Ball with a mass of 10 kg

• Ball with a mass of 15 kg

• Ball with a mass of 20 kg

Tags

NGSS.MS-PS2-2

If a car is moving backward along a road, can its speed be measured?

• Yes, it can, because the car does not have friction acting on it

• Yes, it can, because the car travels a distance in a certain amount of time

• No, it cannot, because sped can only be measured if the car is moving forward

• No. it cannot, because the distance traveled backward by a car cannot be measured

Tags

NGSS.MS-PS3-1