Answers2003390-Physics 1 Honors Sem. 1 - PetersNewton's Second Law

Newton's Second Law Answers

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How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2?

A
0.013 N
B
75 N
C
108 N
D
1080 N
2
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An object pulled to the right by two forces has an acceleration of 2.5 m/s2. The free-body diagram shows the forces acting on the object.

Question illustration
A
50 N
B
98 N
C
313 N
D
490 N
3

Newton’s second law of motion states that the acceleration of an object is proportional to the net force acting on it.

Answer not available
4

Which quantity may be calculated directly using Newton’s second law of motion?

A
weight
B
velocity
C
position
D
direction
5

Devon has several toy car bodies and motors. The motors have the same mass, but they provide different amounts of force, as shown in this table.The bodies have the masses shown in this table.

Question illustration
A
motor 1, with body 1
B
motor 1, with body 2
C
motor 2, with body 1
D
motor 2, with body 2
6

Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?

A
It is less than the acceleration of the backpack because she has a greater mass.
B
It is greater than the acceleration of the backpack because she has a greater mass.
C
It is less than the acceleration of the backpack because she uses a smaller force.
D
It is greater than the acceleration of the backpack because she uses a larger force.
7

Chang sees the following formula on a website about Newton’s second law. a =

Question illustration
A
He needs to find the net force acting on the object in a direction.
B
He needs to use only forces acting in the direction of motion.
C
He needs to combine the horizontal and vertical forces.
D
He needs to multiply the horizontal and vertical forces.
8

What is the mass of an object if a net force of 8.0 N causes it to accelerate at 1.1 m/s2?

A
6.9 kg
B
7.3 kg
C
8.8 kg
D
9.1 kg
9

Which formula is used to calculate the mass of an object if the force and acceleration are known?

A
m = Fa
B
m =
Option B
C
m =
Option C
D
m = F – a
10

For problems that involve an object accelerating along an inclined plane, how can the weight be used to determine the force component that causes motion?

A
The weight is the full force that acts perpendicular to the surface of the ramp.
B
The weight times the cosine of the ramp’s angle is the force perpendicular to the ramp.
C
The weight times the sine of the angle of the ramp acts down along the ramp.
D
The weight times the cosine of the angle of the ramp acts down along the ramp.

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