Physics - CH 4 Review

H. Physics Chapter 4 Review

Use your notes and your formulas to complete these tasks:

F_net = ma

a = F_net/m

F_w = mg

F_f = μn

​To solve a Newtons 2nd law problem:

• ​Draw a free-body diagram showing the direction and relative strength of each force acting on the system

• Add the foce vectors to find the net force​

• Use Newton's second law to calculate the acceleration

• Use what you know about accelerated motion to find the velocity or position​ of the object(s)

Multiple Choice

The combination of all the forces acting on an object is the...

• net force
• action force
• reaction force
• balance force

Multiple Choice

Find the acceleration of an object with 1 kg and 1 N.

• 10 N

• 1 N

• 1 m/s²

• 10 m/s2

Multiple Choice

A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object.

• 4 m/s²

• 0.25 m/s²

• 100 m/s²

• 2 m/s²

Multiple Choice

Aliya kicks a soccer ball with a mass of 0.5 kg. It accelerates with a rate of 5 m/s². What would be the force she used to kick it?

• 0.1 N

• 10 N

• 2.5 N

• 15 N

Multiple Choice

The mass of a young elephant is 100 kg. How much force would be required to accelerate the elephant at a rate of 3 m/s²?

• 300 N

• 33.3 N

• 0.03 N

• 10 N

Multiple Choice

Sophia, whose mass is 52 kg, experienced a net force of 1800 N at the bottom of a roller coaster loop during her school's physics field trip to the local amusement park. Determine Sophia's acceleration at this location.

• 10.2 m/s/s

• 1852 m/s/s

• 5600 m/s/s

• 34.6 m/s/s

Multiple Choice

Determine the net force required to accelerate a 540-kg ultralight car at 2.7 m/s².

• 1458 N

• 200 N

• 55 N

• 1987 N

Multiple Select

Which free body diagrams show balanced forces? (You can select more than 1)

• A

• B

• C

• D

• E

Multiple Select

Which of the freebody diagrams show unbalanced forces?

• A

• B

• C

• D

Multiple Choice

Use the free-body diagram shown to determine the acceleration of this 91.8-kg object.

• 150 m/s/s down

• 1.63 m/s/s down

• 5.2 m/s/s down

• 110 ms/s/s up

Multiple Choice

An object is experiencing a constant acceleration of

2.11 m/s/s. It is being pushed along a horizontal surface by a 600-Newton force and experiences an opposing force of 475 Newtons. What is the mass of the object?

• 125 kg

• 59.2 kg

• 24.2 kg

• 10.4 kg

Multiple Choice

While skydiving, Dee Selerate opens her parachute and her 53.4-kg body immediately accelerates upward for an instant at 8.66 m/s/s. Determine the upward force experienced by Dee during this instant.

• 986.3 N

• 321.4 N

• 53.6 N

• 1045.2 N

Multiple Choice

A rightward force is applied to a 6-kg object to move it across a rough surface at constant velocity. The object encounters 15 N of frictional force. What is the applied force on the object?

• 0 N

• 25 N

• 75 N

• 15 N

Forces

Fill in the Blanks

a 43 kg box is on a frictionless 32 degree inclined plane. What is the F_g

Multiple Choice

A cart rolls down an inclined plane with constant speed as shown in the diagram below. Which arrow represents the direction of frictional force?

• A
• B
• C
• D

Multiple Choice

A block rests on a ramp, making angle θ with the horizontal. As theta is increased

• the blocks mass will decrease
• the blocks mass will increase
• the blocks component of weight parallel to the ramp will increase
• the blocks component of the weight parallel to the ramp will decrease

Multiple Choice

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

Multiple Choice

A 20 kg minifridge resting on the floor requires a 120 N horizontal force to move it from rest. What is the coefficient of static friction between the minifridge and the floor?

• 0.61

• 0.51

• 0.49

• 0.69

Multiple Choice

The coefficient of static friction between a television and oak table is 0.4. If the television's mass is 30 kg, how much force is required to begin moving the television to the left?

• 117.6 N

• 92.1 n

• 143 N

• 75.7 N

Multiple Choice

A 5 kg plate of brisket is sliding across a table. If the coefficient of kinetic friction between plate and table is 0.44, how much force must be applied to the plate for it to slide at a constant velocity across the table?

• 21.6 N

• 32.6 N

• 0.75 N

• 126.8 N