Net Forces

Net Forces

All the forces acting on an object

Multiple Choice

What is the name of the force keeping the box from falling through the floor?

• normal

• gravity

• applied

• friction

Multiple Choice

What is the name of the force keeping the box on the floor?

• normal

• gravity

• applied

• friction

Multiple Choice

What is the name of the force acting between the floor and the box?

• normal

• gravity

• applied

• friction

Multiple Choice

What is the name of the force being applied by the person pushing on the box?

• normal

• gravity

• applied

• friction

Multiple Choice

The force that causes objects to remain at rest on a flat surface and is also called support force

• Weight

• Mass

• Normal force

• Gravitational force

Multiple Choice

Which force is so low that it causes the man to slip and fall?

• Gravity
• Friction
• Air Resistance
• Motion

Multiple Choice

Which of these is a non-contact force?

• Friction

• Air resistance

• Upthrust

• Gravity

Multiple Choice

Why is person B having a hard time moving down the hill?

• Person B has more friction than person A.
• Person B has the same friction as person A.
• Person B is out of shape.
• Person B has less friction has person A.

Multiple Choice

When an object changes it motion and starts to accelerate, we consider to the object to have:

• balanced forces

• unbalanced forces

Multiple Choice

If all four forces are balanced, the plane will

• plummet to the ground
• fly faster and faster
• fly slower and slower
• fly at a constant speed and direction

Multiple Choice

Pick the correct statement about forces and motion.

• For an object to move at a constant speed or accelerating it must have unbalanced forces.

• Objects moving at a constant speed have unbalanced forces while objects that are accelerating have balanced forces.

• Objects moving at a constant speed have balanced forces while objects that are accelerating have unbalanced forces.

• For an object to move at a constant speed or accelerating it must have balanced forces.

Multiple Choice

Which of the following is an example of a balanced force?

• An aeroplane taking off.

• Kicking a football.

• A car slowing down.

• A boy standing still.

Multiple Choice

Which of the following is an example of an unbalanced force?

Multiple Choice

An airplane is travelling North through the sky at a constant speed when turbulence causes it to take a different route, changing its direction. Explain the forces at work on this plane.

• Unbalanced, because the plane is moving forward, not backwards
• Unbalanced, because the speed is constant and there is a change in direction
• Balanced, because the plane is not falling to a lower altitude
• Unbalanced, because the plane is in motion

Multiple Choice

Which could be an example of a balanced force?

• An asteroid moving at a constant speed through space 
• A car accelerating from a stop sign
• A box of dishes falling from a counter 
• A rocket taking off 

Multiple Choice

Which could be an example of an unbalanced force?

• A plate sitting on a dining table
• A ball at the top of a hill that is not moving
• Earth orbiting the Sun 
• A baseball that has been thrown to home plate.

Multiple Choice

• Balanced
• Unbalanced

Multiple Choice

• Balanced
• Unbalanced

Multiple Choice

If an object is not moving the forces acting upon it are _____________

• unbalanced
• weak
• balanced
• Hulk Smash!

Multiple Choice

A ____________ is a push or a pull on an object.

• friction
• force
• magnet
• gravity

Multiple Choice

Which one is balanced?

• top
• bottom
• both

Multiple Choice

Forces that have a net force of zero ( the object is still).

• Balanced force
• Unbalanced force

Multiple Choice

This list below includes six different scenarios. Which objects in the list experience an unbalanced force?

• The ball, the cat, and the flag
• The marble, the book and the toy car
• The cat, the book, and the flag
• The marble, the ball, the cat, and the toy car

Multiple Choice

A toy car was used in an investigation about forces. During which of the following scenarios was the car experiencing balanced forces?

• The toy car speeds up as it rolls down a ramp.
• The toy car travels forward at a constant speed.
• The toy car slows down as it rolls up a hill.
• The toy car changes direction at a constant speed.

Multiple Choice

When an object has a net for that is GREATER than 0 Newtons, the object is...

• balanced and still
• balanced and moving at a constant speed
• unbalanced and accelerating
• unbalanced and still

Multiple Choice

What is the sum of all forces acting on an object and direction?

• Net Force

• Balanced Force

• Unbalanced Force

• Applied Force

Multiple Choice

What is the unit for force?

• Joules (J)

• seconds (s)

• Newtons (N)

• meters (m)

Multiple Choice

Newton's first law tells us that an object that is at rest will remain at rest, and an object that is moving will continue to move in a straight line with constant speed, if and only if the net force acting on that object is:

• zero

• greater than zero

Multiple Choice

If there are two forces going in the same direction how would you find the net force?

• Subtract
• Add
• Neither
• Multiply

Multiple Choice

What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N 

Multiple Choice

What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

Multiple Choice

If there are two forces going in opposite directions how would you find the net force?

• Subtract

• Add

• Neither

• Multiply

Multiple Choice

Calculate the Net Force. 

• 60N, Left 
• 40N, Right 
• 0N
• 60N, Right

Multiple Choice

Calculate the resultant force.

• 40N, Left

• 40N, Right

• 0N, Balanced

• 75N, Right

Multiple Choice

What is the net force?

• 11 N left
• 11 N right
• 3 N left
• 3 N right

Multiple Choice

What is the net force?

• 3 N left
• 3 N right
• 7 N left
• 7 N right

Multiple Choice

Which of the blocks above has balanced forces acting on it?

• A
• B
• C
• D

Multiple Choice

In which direction will the box accelerate?

• Down and to the left
• Up and to the right
• Up and to the left
• Down and to the right

Multiple Choice

In which direction will the box accelerate?

• Down and to the left

• Down and to the right

• Up and to the left

• Up and to the right

Multiple Choice

In which direction will the box accelerate?

• Up
• Down
• Left
• Right

Multiple Choice

In which direction will the box accelerate?

• Up or down
• Left or right
• There is not enough information
• The box will not accelerate

Multiple Choice

A girl is pushing a cart by herself with a force of 7 N. What will happen if a boy begins to help her and their combined force is 17 N?

• The cart will speed up.
• The cart will slow down.
• The cart will move at a constant speed in a straight line.
• The cart will fly to never never land!

Multiple Choice

The boat moves to the left at a speed of 4 m/s. The current moves to the right at 2 m/s. What will happen if the current increases to 3 m/s?

• The boat will speed up.
• The boat will slow down. 
• The boat will move backwards.
• The boat will continue sailing to the left at a constant speed of 4 m/s.

Multiple Choice

The boat moves to the left at a speed of 4 m/s. The current moves to the right at 2 m/s. What will happen if the current increases to 5 m/s?

• The boat increase speed and continue moving left.
• The boat will sink. 
• The boat will move backwards.
• The boat will continue sailing to the left at a constant speed of 4 m/s.

Multiple Choice

Which force diagram best represents the forces acting on the box?

Multiple Choice

Which of the following has a net force of 0 Newtons?

• An asteroid moving at a constant speed through space 
• A car accelerating from a stop sign
• A box of dishes falling from a counter 
• A rocket taking off 

Multiple Choice

Two teams were having a tug of war.  Team A had four people on the team, and each of them pulled with 25N of force.  Team B had three people on the team, and each of them pulled with 35 N of force.  Which team won, and how much greater was their net force on the rope?

• Team B by 5 N
• Team B by 30 N
• Team A by 20 N
• Team B by 65 N

Multiple Choice

Students are playing tug-of-war. If group B pulls the rope to the right with a force of 400 N and group A pulls the rope to the left with a force of 250 N, what will happen to the ribbon in the middle of the rope?

• The ribbon will move to the left and group A will win the tug-of-war.
• The ribbon will move to the left and group B will win the tug-of-war.
• The ribbon will move to the right and group B will win the tug-of-war.
• The ribbon will move to the right and group A will win the tug-of-war.

Multiple Choice

A box is sitting on a table when a person comes up and pushes the box with 5 N of force to the left. The box has 5 N of friction force in the opposite direction.

What would be the minimum force needed to move the box?

• 1 N

• 5 N

• 6 N

• 10 N