If the sum of all the forces acting on a moving object is zero, the object will _____.

• slow and stop

• immediately stop

• accelerate uniformly

• continue with a constant velocity

Tags

NGSS.HS-PS2-1

Acceleration is _____.

• inversely proportional to mass

• inversely proportional to force

• directly proportional to mass

• directly proportional to momentum

Tags

NGSS.HS-PS2-1

How does a rocket fly?

• The rocket pushes against the air.

• Gas expelled from the rocket pushes the rocket.

• both a and b

• magic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-3

An object can enact a force on itself.

• True

• False

Three arrows with different masses are flying through the air without air resistance. How does the horizontal force acting on each arrow compare to one another?

• The largest arrow has the greatest force.

• The force depends on the speed of the arrows.

• The arrows experience the same force.

• Cannot be determined

Tags

NGSS.HS-PS2-1

Which object has the most inertia?

• A 5kg tennis ball traveling at 10m/s.

• A 30kg book resting on a desk.

• A 0.2kg leaf falling from a tree.

• A 20kg brick thrown at 15m/s.

Tags

NGSS.HS-PS2-1

A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle Θ with the horizontal, as shown. The normal force exerted on the block by the surface has magnitude_____.

• greater than W

• greater than 0 but less than W

• equal to W

• 0

Tags

NGSS.HS-PS2-1

Taylor wants to test the effect of friction. She places a block on a plank and raises one end so that the plank is inclined. What is the maximum angle that incline can have before the block begins to accelerate if the coefficient of friction is 0.7?

• 46°

• 10°

• 35°

• 44°

An object falling through the air at terminal speed experiences ______.

• a net force of 0

• equilibrium

• no acceleration

• all of the above

Tags

NGSS.HS-PS2-1

How many categories of forces are there?

• 1

• 2

• 5

• 7

Tags

NGSS.HS-PS2-4