Dynamics

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 

• 0.78
• 0.51
• 0.78 N
• 0.58 N

Tags

NGSS.HS-PS2-1

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

• it is positive

• it is negative

• it is zero

• not enough information is given

Tags

NGSS.HS-PS2-1

For friction on an incline, what direction does F_p point?

• Always perpendicular to the surface

• Always down the incline and parallel to the surface

• Always up the incline and parallel to the surface

• It depends on the direction of motion

Normal force is

• Always opposite the weight

• Always parallel and down the incline

• Always perpendicular to the surface

• It depends on the direction of motion

The diagram represents a person using a spring scale to pull a wooden block up a ramp.The plastic straws were placed under the wooden block to

• decrease the mass of the block

• decrease the amount of friction

• increase the surface area of the ramp

• increase the gravitational attraction of the block

Name the missing force...

• applied force
• weight force
• lift
• normal force

Tags

NGSS.HS-PS2-1

Name the missing force...

• normal force
• applied force
• frictional force
• tension force

Tags

NGSS.HS-PS2-1

Weight is _________.

• the quantity of matter in an object.

• the measure of an object's inertia.

• the force exerted by gravity on an object's mass.

• equal to the mass of an object.

Tags

NGSS.HS-PS2-4

A person accelerating upward in an elevator would experience a temporary __________ in __________.

• increase, weight

• decrease, weight

• increase, mass

• decrease, mass

Tags

NGSS.HS-PS2-1

When a weight is supported by a string and pulled slowly by second string from below, the _________ string will break first.

• upper

• lower

Tags

NGSS.HS-PS2-1