Laws of Motion
What is Newton's first law of motion?
An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
A box is pushed to the right with a force of 15 N. Friction pushes back to the left with a force of 5 N.
What is the net force on the box, and in which direction does it move?
10 N right TRADE A TEAMMATE AWAY!
Newton created ________ (how many?) laws of motion.
Three
What is the total force acting on an object?
Net Force TRADE A TEAMMATE AWAY!
A car is easier to push than a bus. This is an example of which of Newton's Laws?
Newton's 2nd law.
This is the natural tendency of objects to keep on doing what they're doing.
Inertia
Two students push a cart. One pushes with 30 N to the left, and the other pushes with 10 N to the right.
What is the net force acting on the cart?
20 N left
A person pushes on the petal of a bike and causes it to move to the left. The applied force was 85 N left and the force of friction was 12 N right. What is the net force AND direction?
73 N Left
What measurement is used for force?
Newtons
The slingshot was pulled back and the rock propelled forward. This is an example of which law of motion?
Newton's 3rd law.
What is Newton's Second Law of Motion
F = ma. (Force = Mass x Acceleration)
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A book is resting on a table. Gravity pulls it down with 10 N, and the table pushes up with 10 N.
What is the net force on the book?
0 N TRADE A TEAMMATE AWAY!
This is a push or pull.
Force TRADE A TEAMMATE AWAY!
When two forces are equal and going in opposite directions.
Balanced Forces TRADE A TEAMMATE AWAY!
A kickball continues to roll until it hits the fence. This is an example of which law of motion?
Newton's 1st law. TRADE A TEAMMATE AWAY!
A magician pulls a tablecloth out from under dishes and the glasses don't fall. This is known Newtons first law or ______?
Newton's First Law and the Law of Inertia
A sled is pulled with 25 N to the right and 25 N to the left at the same time.
What is the net force acting on the sled?
0 N
This is a resistance to change.
Inertia
Two forces-not equal, acting in same or opposite directions.
Unbalanced Forces TRADE A TEAMMATE AWAY!
You let the air out of a balloon- the air goes one way and the balloon goes the opposite direction. This is an example of which law of motion?
Newton's 3rd law.
Newton's 3rd law states this:
For every action there is an equal and opposite reaction. TRADE A TEAMMATE AWAY!
A dog pulls a wagon with a force of 40 N forward. The wagon experiences 10 N of friction and 5 N of air resistance, both acting backward.
What is the net force on the wagon, and in what direction?
15 N forward
When all of the forces acting upon an object balance each other, what will happen to the acceleration of the object?
No change in acceleration. No movement
A force that happens when two things rub against each other. It slows down or stops movement.
Friction
A baseball hit with a wooden bat goes farther than a baseball hit with a plastic bat. This is an example of which law of motion?
Newton's 2nd law. TRADE A TEAMMATE AWAY!