A boy rides a skate board down a hill. Eventually the skate board stops. Which is most responsible for causing the skateboard to stop?

• gravity acting on the skateboard

• friction acting on the skateboard

• the mass of the skateboard

• the mass of the boy

Tags

NGSS.MS-PS2-2

A book falls off the desk. What moves the book towards the floor?

• mass

• friction

• gravity

• speed

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What will most likely stop an object in motion?

• mass

• force

• acceleration

• inertia law

Tags

NGSS.MS-PS2-2

How does the mass of an object affect acceleration?

• The greater the mass of an object the greater the force needed to accelerate the object

• The greater the mass of an object the smaller the force needed to accelerate the object

• the smaller the mass of an object the greater the force needed to decelerate the object

Tags

NGSS.MS-PS2-2

A phone is sitting on the dash of the car, which is stopped at a red light. Why does the phone slide backwards as the car begins to move forward?

• phone has inertia

• the phone has momentum

• the phone has acceleration

Tags

NGSS.MS-PS2-2

How would the absence of friction affect a steel ball traveling on a long straight path

• steel ball's speed would decrease

• steel ball's speed would increase

• steel ball would stop immediately

• steel ball would remain at a constant speed

Tags

NGSS.MS-PS2-2

What is an example of an unbalanced force

• a cat sitting on a chair

• an alligator sleeping in the sun

• a boy jumping off his bike

• a book lying on a desk

Tags

NGSS.MS-PS2-2

What will happen to the book if no other forces act upon it?

• book will stay at rest

• book will begin to move

• mass of the book will increase

• gravity on the book will increase

Tags

NGSS.MS-PS2-2

How does a wagons motion change when additional force is applied?

• as force increases, acceleration increases

• as force increases, acceleration decreases

• as forces increases, the wagon's mass changes

• as forces increases, the wagon direction changes

Tags

NGSS.MS-PS2-2

A snow plow uncovered 100 miles of road in 4 hours . What was the average speed of the plow? (speed = distance divided by time)

• 20 mph

• 25 mph

• 50 mph

• 100 mph