AnswersHSPHY Physics Sem 1 26-27Lesson 1: Introduction to Forces

Introduction to Forces Answers

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A box is pushed down at an angle of 32 degrees on a rough surface. The box moves to the right.

Question illustration
A
F subscript net, y = F subscript N minus F subscript g.
Option A
B
F subscript net, y = F subscript p minus F subscript f.
Option B
C
F subscript net, y = F subscript N minus F subscript g minus F subscript p cos(32).
Option C
D
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Option D
2
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20455075

A
20
B
45
C
50
D
75
3

A moving object is in equilibrium. Which best describes the motion of the object if no forces change?

A
It will change directions.
B
It will slow down and stop.
C
It will maintain its state of motion.
D
It will speed up and then slow down.
4

Which describes a positive or negative net force acting on an object? Check all that apply.It can cause an object to accelerate.It can cause an object to stop moving.It can cause an object to start moving.It can cause an object to change directions.It can cause an object at rest to remain at rest.

A
It can cause an object to accelerate.
B
It can cause an object to stop moving.
C
It can cause an object to start moving.
D
It can cause an object to change directions.
E
It can cause an object at rest to remain at rest.
5

A book is sitting on a desk. What best describes the normal force acting on the book?

A
the upward force the desk pushes on the book
B
the upward force the book pulls on the Earth
C
the downward force the book pushes on the desk
D
the downward force the Earth pulls on the book
6

A box is being pulled to the right. The free body diagram is shown.

Question illustration
A
25 N
B
125 N
C
375 N
D
500 N
7

A box is pulled to the right with a force of 65 N at an angle of 58 degrees to the horizontal. The surface is frictionless. The free body diagram is shown.

Question illustration
A
30 N
B
34 N
C
55 N
D
65 N
8

A box is at rest on a ramp at an incline of 22°. The normal force on the box is 538 N.

A
202 N
B
217 N
C
499 N
D
580 N
9

A framed picture hangs from two cords attached to the ceiling.Which shows the correct free body diagram of the hanging picture?

Question illustration
A
Option
B
Option
C
Option
D
Option
10

A bucket of water experiencing a gravitational force of 525 N is pulled up from a water well. The net force in the y-direction is 45 N; therefore, the magnitude of the force of tension is N.

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