Newton's Laws
Who created the three laws of motion?
Isaac Newton
A box is being pushed right with a force of 15 N and left with a force of 10 N. What is the net force?
5 N to the right
is the location of an object in relation to a nearby object or place.
position
In a tug-of-war game, which law of motion explains why both teams feel an equal pull on the rope?
Newton's Third Law
_____________________ is the speed of an object in a particular direction.
velocity
What are the three laws of motion?
Two students are pushing a cart. Student A pushes with 20 N to the right, and Student B pushes with 20 N to the right. What is the net force?
40 N to the right
When an object changes position, it is in?
motion
When an astronaut pushes off from a spacecraft in space, what happens due to Newton's Third Law?
Both the astronaut and spacecraft move in opposite directions
______________________ is when something speeds up, slows down, or changes direction.
acceleration
What is an example of Newton's first law of motion?
a. a soccer ball rolling forever on a frictionless surface.
b. pushing a heavy box requires more force than pushing a light box?
a. a soccer ball rolling on a frictionless surface.
A toy car is pulled with 12 N to the right and 17 N to the left. Calculate the net force.
5 N to the left
You know something is moving if its position changes against the background. The background is called the ______________________.
frame of reference
A book is sitting still on a desk. The force of gravity pulling down equals the force of the desk pushing up. Is this an example of balanced or unbalanced forces? why?
balanced forces because the book doesn't move
Forces can____________ and ____________ on matter from all directions.
push and pull
Which is the best example for Newton's third law?
a. a ball rolling down a hill
b. a person sleeping on a bed
c. a swimmer pushing water backward to move forward.
c. a swimmer pushing water backward to move forward.
Three forces act on a ball: 8 N up, 8 N down, and 3 N up. What is the net force?
0 N
You can choose any part of a background as a _________________.
reference point
A child is pushing a heavy box across the floor, and the box is moving at a steady speed. Are the forces balanced or unbalanced? Why
balance forces because the box is moving at a constant speed
Forces are measured with a spring scale in units called __________________.
newton's
Which is the best example of Newton's Second Law?
a. a book staying still on a table
b. hitting a tennis ball with a different amount of force changes how far it goes.
c. two magnets repelling each other.
b. hitting a tennis ball with a different amount of force changes how far it goes.
A box has four forces acting on it: 25 N right, 15 N left, 5 N right, and 10 N left. Find the net force.
5 N right
_____tells you how the position of an object changes during a certain amount of time.
Speed
A soccer ball is rolling slower and slower until it stops. Are the forces acting on the ball balanced or unbalanced? why?
Unbalanced forces because friction is slowing the ball down.
________________________ is a force of attraction between two objects.
gravity