Force and Motion

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

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

• direction

• mass

• speed

• force

Tags

NGSS.MS-PS3-1

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

A ball is kicked and rolls along a level field until it comes to a stop. What is most responsible for the ball coming to a stop?

• air

• friction

• gravity

• mass

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 speed can only be measured if the car is moving forward.

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

Scientists discover an asteroid that is moving through space. What information is needed to determine the average speed of the asteroid?

• the mass and size of the asteroid

• the distance the asteroid is from Earth

• the direction the asteroid is moving and its distance from Earth

• how far the asteroid has moved in 24 hours

Tags

NGSS.MS-PS3-1

What causes a wagon to speed up when going down a hill?

• gravity

• friction

• air pressure

• mass

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

NGSS.MS-PS3-1

A bowling ball moves across a flat surface at 7 feet per second. If a student is asked to calculate the total distance traveled by the ball, what other information does the student need to know?

• amount of friction between the ball and the surface

• amount of force applied to the ball

• total time the ball rolled

• mass of the ball

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

Which graph represents an object that is decreasing in speed?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-5