Friction

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?

• gravity acting on the wagon
• the mass of the wagon
• friction acting on the wagon
• the mass of the child

Tags

NGSS.MS-PS2-5

NGSS.MS-PS3-5

Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball?

• compare the sizes of the students
• compare the ages of the students
• compare the distances that the ball rolled
• compare the number of times the ball was rolled

Tags

NGSS.MS-PS2-2

Two identical balls are pushed with the same force. One ball is pushed along a flat surface and the other ball is pushed down a slanted surface. Which ball will travel faster and why?

• the ball on the flat surface, because of increased friction
• the ball on the flat surface, because of decreased gravity
• the ball on the slanted surface, because of increased gravity
• the ball on the slanted surface, because of decreased friction

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

NGSS.MS-PS3-5

Sam is building a car to race down a ramp. The car weighs 100 grams. Which could Sam do to increase the speed of the car?

• increase the mass of the car
• decrease the mass of the car
• increase the friction on the ramp

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What keeps the Moon orbiting Earth?

• the Sun’s gravity
• the Moon’s rotation
• Earth’s rotation
• Earth’s gravity

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Which is the best example of a pushing force that reduces the speed of an object?

• a bat hitting a baseball
• a brake rubbing against a wheel
• a pedal turning the wheels of a bicycle
• a skateboard wheel rolling against pavement

Gravity pulls things which way on the Earth?

• up
• down
• over
• under

Tags

NGSS.5-PS2-1

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

• mass
• friction
• gravity
• speed

Tags

NGSS.MS-PS2-4

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

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