Newtons Laws - 1 & 2

​PHET motion

​Objects only move when there is an UNBALANCED force.

​

When F_net ≠​ 0

​

​10 N

​5 N

Multiple Choice

What is Newton's First Law

• F=ma

• Every action has an equal and opposite reaction

• Friction

• An object at rest stays at rest, an object in motion stays in motion unless acted upon by an unbalanced force.

Multiple Choice

True or False. Acceleration of an object is directly proportional to the net force acting on it?

• True

• False

Multiple Choice

Calculate the net force of the object in the image shown.

• 20N
• 35N
• 5N
• 25N

Multiple Choice

What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

Multiple Choice

What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N 

Multiple Choice

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

• friction

• force

• magnet

• gravity

Multiple Choice

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

Multiple Choice

The sum of all forces acting on an object.

• Contact Force
• Balanced Force
• Unbalanced Force
• Net Force

Multiple Choice

What will cause an object to move?

• Applied forces
• Balanced forces
• Unbalanced forces

Multiple Choice

With unbalanced forces, the object will move in the direction of the _______ force.

• larger 
• smaller 
• equal 

Multiple Choice

A force is a push or pull measured in what units? 

• Meters per second, squared
• Kilograms 
• Newtons 

Multiple Choice

When the vectors (arrows) point in the same direction what function do you use? 

• Dividing 
• Multiplying 
• Subtracting 
• Adding 

Multiple Choice

When the vectors (arrows) point away what function do you use?

• Dividing

• Multiplying

• Subtracting

• Adding

Multiple Choice

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

• unbalanced
• weak
• balanced
• Hulk Smash!

​If there is an UNBALANCED force on an object, it will accelerate in the direction of the net force!

​

We can calculate its acceleration with NEWTON's 2nd Law

​

F = ma​

Multiple Choice

The more mass an object has, the _______ force it takes to accelerate it.

• more

• less

Multiple Choice

What is the net force required to accelerate a 20 kg bike accelerates at 10 m/s²?

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

Multiple Choice

(Using F_net=ma), What net force is required to accelerate a car at a rate of 2 m/s² if the car has a mass of 3,000 kg?

• 6,000 N

• 1,500 N

• 3,002 N

• 2,998 N

Multiple Choice

(Use F_net=ma), A 10 kg bowling ball would require what force to accelerate down an alleyway at a rate of 3 m/s²?

• 30 N

• 13 N

• 3.3 N

• 0.3 N

Multiple Choice

(Use F_net=ma). Sally has a car that accelerates at 5 m/s². If the car has a mass of 1,000 kg, how much force does the car produce?

• 5,000 N

• 200 N

• 0.005 N

• 1,005 N

Multiple Choice

(Use F_net=ma). What is the mass of a falling rock if it produces a force of 147 N? (Acceleration due to gravity = 9.8 m/s²)

• 15 kg

• 1,440.6 kg

• 156.8 kg

• 137.2 kg

Multiple Choice

(Use F_net=ma). What is the mass of a truck if it produces a force of 14,000 N while accelerating at a rate of 5 m/s²?

• 2,800 kg

• 0.0004 kg

• 70,000 kg

• 13,995 kg

Multiple Choice

(Use F_net=ma). What is the acceleration of a softball if it has a mass of 0.5 kg and hits the catcher's mitt with a force of 25 N?

• 0.5 kg

• 50 kg

• 25.5 kg

• 12.5 kg

Multiple Choice

(Use F_net=ma). Your parents' car has a mass of 2,000 kg. If your car produces a force of 5,000 N, at what rate will it accelerate?

• 2.5 m/s²

• 0.4 m/s²

• 10,000,000 m/s²

• 3,000 m/s²

Multiple Choice

(Use F_net=ma). Use the diagram to determine the net force, assume the object is accelerating at a rate of 3 m/s², and determine the object's mass?

• 3 kg

• 5 kg

• 60 kg

• 75 kg

Multiple Choice

Since Force = Mass * Acceleration, how would you manipulate the equation to solve for mass?

• Divide both sides of the equation by Mass
• Divide both sides of the equation by force
• Divide both sides of the equation by acceleration
• Equations cannot be manipulated

Multiple Choice

(Use F_net=ma). Use the diagram to determine the net force, assume the object is accelerating at a rate of 2 m/s². What amount of mass does the object have?

• 2 kg

• 4 kg

• 6 kg

• 8 kg

Multiple Choice

If the man pushes with an equal amount of force, which object will accelerate more?

• Car because it has more mass

• Lawnmower because it has less mass

• Car because it has less mass

• Lawnmower because it has more mass

Multiple Choice

A force of 90N is applied to each cart below, which one will accelerate the fastest?

• Cart 1
• Cart 2
• Cart 3 
• Cart 4

Multiple Choice

What is the net force for this situation?

• 17 N Right
• 17 N Left
• 3 N Right
• 3 N Left

Multiple Choice

If the mass of the car/man/parachute is 150 kg, what is their acceleration?

• 0.02 m/s²

• 50 m/s²

• 0.11 m/s²

• 8.82 m/s²

Multiple Choice

If a baseball and a cannonball are dropped from the same height at the same time, which ball will hit the ground first?

• the cannonball
• the baseball
• The balls land at the same time.
• the ball with the larger volume

Multiple Choice

Which has the MOST inertia?

Multiple Choice

Which one has the LEAST inertia?

Multiple Choice

What is the NET FORCE of this diagram?

• 17 N, right

• 17 N, left

• 23 N, right

• 12 N, up