Vocab
What is force?
Push or a pull
Daily Double!
Who explained the relationship between force and motion with the three laws of motion?
Sir Isaac Newton
What is the formula for force?
f=mxa
What is a unbalanced force?
When the net forces aren’t 0N
Daily Double!
A 10 N force is pulling on a box to the right , while a 4 N force is pulling to the left. What is the net force on the box? In which direction does the box move?
6 N right
What is the unit for force?
Newtons (N)
What is Newton’s First Law of Motion?
An object in motion stays in motion, and object at rest stays at rest unless it experiences a equal or greater force
What is the formula for acceleration?
a=f/m
Daily Double!
When the net force on an object is zero, the object's motion will: A. change B. not change C. stop
B. not change
Two people push a cart in the same direction. One applies a force of 30 N, and the other applies a force of 20 N. What is the net force acting on the cart?
50 N
What is a balanced force?
When a object has a net force of 0N the object
What is Newton’s Second Law of Motion?
Objects that have different masses will have different accelerations if the same amount of force is used
Daily Double!
What is the formula for mass?
mass=f/a
2You and a group of friends are playing tug of war on field day but the rope is not moving! Neither team is winning because the force is ________________________________.
Balanced
Daily Double
A rope is being pulled in opposite directions with forces of 50 N to the right and 50 N to the left. What is the net force? Is the system balanced or unbalanced?
0 N and balanced
Daily Double!
What is a contact force?
A force exerted during contact with objects
What is Newton’s Third Law of Motion?
When you push on a object it actually pushes back
A student pushes a 50 kg cart with a force of 500 Newtons. What is its acceleration?
You push your friend with a(n) ______________________________________ force down the water slide at Seven Springs Water Park. As you push them, they fly down the slide and the force is transferred to the water and causes a big splash!
Unbalanced
Daily Double!
A car experiences a forward force of 500 N from its engine and a resistive force of 300 N from friction. What is the net force on the car, and will it speed up or slow down?
200 N and it speeds up!
What is a net force?
Combination of all the forces acting on an object
Daily Double!
What is the law of inertia?
tendency of all objects to resist change in motion
A 300 kg electronic toy accelerates at a rate of 5 m/s2
What is the force required to produce this acceleration?
1500 N
You and a friend are leaning back to back on the field reading your books. Neither of you fall backwards because the forces are __________________________________.
Balanced
You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the same direction. What is the net force applied on the car?
45 N