Forces, Motion, and Energy

• 10 N

• 100 N

• 0 N

• 7 N

Tags

NGSS.MS-PS2-2

What happens when two forces act in the same direction?

• They cancel each other out.

• You subtract the two numbers to equal the total force in one direction.

• Their strengths are added together.

• You divide by the amount of friction acting on the object.

Tags

NGSS.MS-PS2-2

Before a big drop, tactile paving can be used. A person with a cane might find this helpful because

• The dots have more friction than the typical sidewalk, so the person will slow down and have less energy in the event that they do fall.

• The dots will have more friction than the sidewalk, so it will help the person speed up if they do fall.

• The dots have less friction than the ramp, so a person will slow down and fall with more energy.

• The dots do not help a person with a cane, because they create no friction.

What is the law of inertia?

• It states that objects in motion will come to rest without any outside force acting on them.

• It states that objects in motion will remain in motion unless acted upon by an outside force.

• Objects in motion will always remain in motion even when they are acted upon by an outside force.

• It states that space is the only time in which an object can come to a rest.

When driving in a car, you lean to the left when the car leans to the right due to

• gravity

• velocity

• inertia

• mass

What is the net force?

• 20 N

• 5 N

• 40 N

• 45 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

How do you determine the net force from the people playing tug of war?

• You find the sum (adding) since they are acting in different directions.

• You find the difference (subtracting) because they are acting in different directions.

• You find the difference (subtracting) becuase they are acting in the same direction.

• You find the sum (adding) since they are acting in the same directions.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Known as a part of Newton's Second Law, what is the relationship between force (F) , mass (m) , and acceleration (a) .

• There is none

• F=m/a

• F=a/m

• F = m x a

When energy is dependent on height it is known as

• kinetic energy

• elastic energy

• thermal energy

• gravitational potential energy

Tags

NGSS.MS-PS3-2

What factors are needed for gravitational potential energy?

• speed and height

• mass and direction

• height and mass

• height and speed