Net Force CBA Review

Multiple Choice

What are unbalanced forces?

• forces that are not equal in size and opposite in direction.

• forces that are equal in size and opposite in direction.

Multiple Choice

What are balanced forces?

• forces that are not equal in size and are opposite in direction

• forces that are equal in size and opposite in direction.

Fill in the Blanks

Balanced or Unbalanced

Multiple Choice

Which of the answer choices is NOT a characteristic of a an object experiencing balanced forces?

• no change in motion

• moving at a constant speed

• causes a change in motion

• net force of zero

Multiple Choice

In which of the following situations would a car be speeding up while traveling forward?

• positive velocity and positive acceleration

• positive velocity and negative acceleration

• negative velocity and positive acceleration

• negative velocity and negative acceleration

Multiple Choice

A car is moving from to the right when it suddenly slams its brakes. What is the direction of velocity and force causing acceleration?

• Velocity and acceleration both left to right

• Velocity and acceleration both right to left

• Velocity is right and acceleration is left

• Velocity is left and acceleration is right

Multiple Choice

When a Ferris wheel rotates clockwise at a constant speed of 5 m/s, are the passengers on it accelerating or not?

• No because the rotation is constant

• Yes because the speed is constant

• No because the wheel doesn't have linear motion

• Yes because they are changing direction

Multiple Select

From the following cases, Select the 2 choices that show a bike that has no acceleration?

• A bike moving after a stoplight turns from red to green.

• A bike hitting the brakes while approaching a stop sign

• A bike moving down a straight track at a constant rate of 4 m/m

• A bike leaning into a curved turn while not changing speed

• A bike that is parked and resting on the sidewalk

Multiple Choice

A car is moving from to the right when it suddenly slams its brakes. What is the direction of velocity and acceleration due to the force that was applied by the brakes?

• Velocity and acceleration both left to right

• Velocity and acceleration both right to left

• Velocity is right and acceleration is left

• Velocity is left and acceleration is right

Multiple Choice

If forces are going in the same direction, you should

• add the forces

• subtract the forces

• multiply the forces

• divide the net force

Multiple Choice

The combination of all forces acting on an object is called __________

• Parallelogram Rule
• Net Force
• Vector Quantity
• All the Jedi's using their abilities together

Multiple Choice

What is the net force of this diagram?

• 17 N, right (+)

• 17 N, left (-)

• 23 N, right (+)

• 12 N, up (+)

Multiple Choice

If the force of friction is currently 300 N, and both girls are pushing equally against friction - then how much force does each girl individually apply?

• 300 N

• 100 N

• 150 N

• 0 N

Fill in the Blanks

What is the resulting magnitude (amount) of force?

Newtons

Fill in the Blanks

If the guy is pushing the box with a force of 25 N, and the friction force acting against the box is 15 N, what is the Net force he is pushing the box?

Newtons

Fill in the Blanks

What is the net force?

Newtons

Multiple Choice

What is the mass of a motorcycle that accelerates at 4 m/s² when a net force of 400 N is applied to it?

• 1600 kg

• 100 kg

• 0.01 kg

• 396 kg

Multiple Choice

A 50-kg crate is pushed with a horizontal acceleration of 20 m/s². What net force is acting on the crate?

• 2.5 N

• 0.4 N

• 1000 N

• 30 N

Multiple Choice

If a 10 kilogram object had a force of 50 newton's applied to it, what would its acceleration be?

• 15 m/s²
• 5 m/s²
• 0.5 m/s²
• 10 m/s²

Multiple Select

Select 2 answers:

1. the Net Force

2. the Net Acceleration

• 8 m/s²

• .125 m/s²

• 40 Newtons

• 360 Newtons

• 320 Newtons

Fill in the Blanks

Calculate the net acceleration if the mass of the box is 4 Kg?

(Hint: Find Net Force 1st, then use that Net force to find Net acceleration)

_ m/s²

Multiple Choice

The greater the _____ an object has, the greater its Inertia.

• speed
• mass
• force

• friction

Multiple Choice

Inertia is

• The amount of resistance a mass has to change when a force is applied

• The sum total of all the forces acting on a mass

• The Diagram of all forces acting on a mass

• The coefficient or grip factor due to friction

Reorder

List the objects in order starting from the object with the least inertia and ending with the greatest inertia.

• C

• B

• A

• D

1

2

3

4

• 1
• 2
• 3
• 4

Multiple Choice

A soccer player applies the same 100 N force to 2 different objects, as shown below. Which answer selection best explains how the accelerations of the 2 objects will compare. There is no friction.

• The 2 Kg soccer ball will experience an acceleration equal to the 8 kg bowling ball.

• The 2 Kg soccer ball will experience an acceleration less than the 8 kg bowling ball

• The 2 Kg soccer ball will experience an acceleration greater than the 8 kg bowling ball.

• There is not enough information to compare the accelerations at this point.

Multiple Choice

What is the term for when two forces are acting in opposite directions on an object and are equal in size and the object stays still

• Inertia

• Equilibrium

• Acceleration

• Unbalanced force

Multiple Select

If a ball is rolling at 60 m/hr and the forces on it are balanced. which 2 things are true?

• The object will continue to maintain constant velocity

• The object will not accelerate

• The object will slow down

• The object will speed up

Multiple Choice

Which scenario is at equilibrium(balanced)?

• top
• bottom
• both

Multiple Choice

Which free body diagram best represents the following:

A rightward force is applied to a couch and causes it to accelerate it to the right across the floor.

Multiple Choice

Which object has the largest negative Net force?

• A

• B

• C

• They all have the same net force

Multiple Choice

If the person is pushing backwards with the paddle, why do they move forward?

• The person will actually move backwards, they need to paddle the other way

• The water pushes back with an equal and opposite force

• The person is pushing harder than the water

• The water pushes back with a greater force than the person

Multiple Choice

When Ronda Rousey got kicked in the face, what are the action and reaction forces?

• The foot pushing on face, and face pushing on the foot

• The foot pushing on the face, then the head pushing back on the air

• The foot pushing on the air, then the air on foot

• Face pushing on the foot, and then the face falling on the mat

Multiple Choice

A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this feat

• is less than 2300 N.

• is 2300 N.

• is more than 2300 N.

• cannot be determined.

Multiple Choice

A woman weighing 550 N sits on the floor. She exerts a force on the floor of

• 5.5 N.

• 55 N.

• 550 N.

• 5500 N.

Multiple Choice

Name the missing force...

• tension force
• gravitational force
• normal force
• applied force

Multiple Choice

Force the opposes motion between 2 surfaces

• force
• Newton
• friction
• net force

Multiple Choice

Name the missing force...

• spring force
• weight force
• normal force
• applied force

Multiple Choice

Name the missing force that is acting AGAINST the applied force...

• Frictional force

• Weight force

• Normal Force

• Force of Tension

Multiple Choice

What is a normal force?

• It always opposes gravity. The same as a frictional force.

• It is equivalent to the weight of an object.

• It acts as a supporting force from the surface below.

• It is equivalent to mass.

Multiple Choice

Name the missing force that SUPPORTS when an object is touching a surface...

• weight force
• normal force
• applied force
• frictional force

Multiple Choice

The down-arrow in this diagram most likely represents:

• gravity

• normal

• a push or pull

• friction

Multiple Choice

A man pushes a box across the floor at a constant velocity. There is a force on the box pulling it toward the center of the earth. This is called the

• force of gravity

• normal force

• force of friction

• applied force

Multiple Choice

Name the missing force...

• applied force
• weight force
• tension force
• drag