Newton's Laws
What is Newton's First Law?
An object in motion stays in motion and an object at rest stays at rest.
If a box is being pushed left at a force of 3N on a frictionless surface, what is the net force?
3N Left
What is speed?
How is net force calculated?
Add up all the forces going in the same direction, and subtract all the forces going in opposite directions.
Who invented Newton's 3 Laws of Motion?
Isaac Newton
What is Newton's 3rd Law?
For every action there is an equal and opposite reaction.
Two people are pulling a rope. Person 1 pulls with a leftward force of 40N, and Person 2 pulls with a rightward force of 30N. What is the net force?
10N Left
What is a balanced force?
Two or more forces are acting upon an object, but the net force is 0. There is no motion.
What is the formula for calculating speed?
Speed = distance divided by time (d/t)
What is Newton's 2nd Law?
Force is equal to mass times acceleration.
Which of Newton's Laws is the following statement referring to:
The more mass an object has, the harder it is to accelerate it.
Newton's 2nd Law
Two objects have the same amount of force acting on them. Object I has a mass of 15g, and Object II has a mass of 10g. Which object will have a greater acceleration?
Object II, because the mass and inertia is lower and it is able to accelerate more easily.
What is velocity?
How fast an object is moving along with the direction it's moving in.
On a graph, the line representing the speed of an object is going up in a straight diagonal line. The object is...
Moving at a constant speed away from the starting point.
What are some common measurements for speed? (name at least 2)
Possible Answers: mi/h (miles per hour), km/h (kilometers per hour), m/s (meters per second), ect.
Which of Newton's Laws is the following statement referring to:
Balanced forces result in no change in velocity, but unbalanced forces result in a change in velocity.
Newton's 1st Law
A table is being pushed by two students. Student 1 pushes to the right with a force of 50N and Student 2 pushes to the right with a force of 70N. What is the net force?
120N Right
What is friction?
An outside force that slows down objects by rubbing against them (direct contact)
On a graph, the line representing the speed of an object is curving upwards. The object is...
Accelerating/increasing in speed.
When forces acting upon an object are not balanced, its velocity...
Changes (does not stay the same)
Which of Newton's Laws is the following statement referring to:
The total momentum during a collision between two objects remains the same both before and after. (Law of Conservation of Momentum)
Newton's 3rd Law
Object A has a mass of 100kg and is being pushed west with a net force of 50N, and Object B has a mass of 75kg and is being pulled north with a net force of 25N. Which object accelerates slower? Explain.
Object B, because 25N equals 75kg times the acceleration, 1/3 which is less than the acceleration of 1/2 (50 divided by 100). The less force is being exerted on an object, the higher the acceleration.
What is inertia?
The property of objects that allows them to remain at a constant speed or not move at all. Objects with more mass have more inertia.
How is momentum calculated?
Momentum equals mass multiplied by velocity.(P=MV)
What are some examples of forces that interact on an object? (Name at least 4)
Friction, push, pull, gravity, air resistance, magnetism, ect.