Newton's 1st Law
This is required to overcome an object’s inertia.
unbalanced forces
Two forces act on a 5 kg box: 15 N to the right and 5 N to the left. What is the Net force and direction of the box?
10N to the Left
What force is acting on all objects on earth?
gravity
This states that an object’s motion will not change unless an unbalanced force acts on the object.
Newton's First Law
The Unit of force.
Newton
Lizzie is pushing Alex on a scooter. Lizzie is pushing with 75 N of force to the left, and Alex is helping with 20 N to the left. What is the net force on the scooter?
95 N, to the left
One object pushing on another will always receive a push in return. True or false.
True
Acceleration depends on which two factors?
net force and mass
Forces come in _____
Pairs
Which law? F=mxa
Newton's 2nd law
What is the term for a force that requires physical touching between objects, such as friction or tension?
Contact force
What force class includes gravity, magnetic attraction, and electrostatic charges, operating without touching?
Non-contact forces
Two people are pulling on a chain in opposite directions with forces of 500 N and 600 N. The forces would best be described as ____.
Unbalanced Forces
According to Newton’s Second Law, if the force increased but the mass remained the same, what happens to acceleration?
The objects acceleration increased.
Gravitational force depends on what two things?
Mass and Distance
This natural law states that for every action, there is an equal and opposite reaction.
Newton’s Third Law
Friction always acts in a direction _______________ to the direction of motion.
Opposite
Gravity is an example of which kind of force?
Non-Contact
When mass increases, what happens to inertia?
increases
This occurs whenever an object is acted upon by an unbalanced force.
acceleration
Why do action and reaction forces never cancel each other out to prevent motion?
They act on different objects
If forces are canceled out, they are Balance or Unbalanced forces.
Balanced
T or F: If you throw a ball into the air, Earth exerts a force on the ball. The ball in the air exerts no force on Earth.
False
If you push on a wall with a force of 30 N, the force acting on you from the wall will be...
30N
Objects with more mass are ______ to set in motion.
harder
What is the mathematical formula for Newton's Second Law?
F=mxa
As an objects mass increases, what happens to its momentum?
Increases
What causes a ball that has been kicked across the ground to stop?
Friction
What variable force measures the pull of gravity on an object's mass?
Weight
What term describes the amount of matter in an object, which stays constant everywhere in the universe?
Mass
A car and a train are going the same speed. The car is easier to stop because of this.
less mass and less inertia
When an object reaches steady consistent velocity while falling through air, what is the net force acting on it?
0 Newtons
If the force of gravity pulls down on objects at 9.8 m/s2, how fast do you think an object would move when falling in a vacuum chamber?
9.8 m/s2
When a swimmer pushes backward against the water, in which direction does the water push the swimmer?
Forward
The term used to describe the change in the velocity of a moving object. (speeding up, slowing down, changing direction)
acceleration
A planet is discovered that has twice the mass of Earth but the same gravitational acceleration. If you weigh 700 N on Earth, on the new planet you would weigh ____.
700N