Newton's First Law
An object in motion will stay in motion, and object at rest will stay at rest, unless acted on by an outside force.
What is Newton's second Law
Force = mass x acceleration
What is Newton's Third Law?
Every action has an equal and opposite reaction.
This type of force opposes motion and occurs when two surfaces are in contact.
Friction
A magician pulls a tablecloth out from under dishes and the glasses on the table don’t move.
Newton’s 1st law:
The objects at rest on the table stay at rest
What is inertia?
the natural tendency of an object to remain at rest or in motion at a constant velocity along a straight line.
The tendency of an object to resist change
DAILY DOUBLE!
What are the units of Force?
Newtons
When you jump, who pushes harder-
You or the ground?
You and the ground both push equally. Newton’s 3rd law!
This is the force that pulls objects toward the center of the Earth.
Gravity
A person not wearing a seat belt flies through
the car window when someone slams on the
breaks because the person’s body wants to
remain in motion.
Newton’s 1st law
Which has greater inertia a bowling ball or a tennis ball?
Bowling ball
What does each of variable stand for in the equation F=m x a
F= force
m=mass
a=acceleration
Two cars get in a head on collision.
What happens to the motion of the cars?
Relate your answer to Newton’s 3rd law!
The cars will hit each other with equal force and will move backwards the same distance because they have equal and opposite reactions.
This is the force that allows a crumbled piece of paper to fall faster than a flat piece of paper
Air resistance
A baseball player swings, and the ball pushes
on the bat, and the bat pushes on the ball.
Newton’s 3rd law
Why is it important that you wear your seatbelt in the car? Explain in terms of Newton's First Law.
Seatbelt provides an outside force to stop your body from moving the same speed as the car, without a seatbelt your body will remain in motion even when the car stops.
What happens to force is the mass of an object increases?
Force required to move object increases
A soccer player kicks a ball with their
foot and their toes are left stinging.
Why?
Action: kicking the ball
Reaction: Toes left stinging.
According to Newton's Second Law of Motion, the equation for force is this.
F=(mass)(acceleration)
DAILY DOUBLE!!
Pushing a child on a swing is easier than
pushing an adult on the same swing,
because the adult has more inertia.
Newton’s 2nd law
Explain why you can set a playing card on top of a cup, and a quarter on top of the card, pull the card, and the quarter will fall in the cup instead of getting pulled with the card.
An object at rest stays at rest,
So the quarter doesn’t move with the card
A large football player and a small football player are running at you during a game. Explain who would hit you with greater force. Why?
The large player would hit you with greater force because he has a bigger mass.
A balloon is blown up and the person lets go.
What are the action and reaction forces?
Action: Air out of balloon
Reaction: Balloon moves forward
DAILY DOUBLE!
If a 10 kg object accelerates at 2 m/s², and the force of friction opposing the motion is 15 N, the net force acting on the object is this
5 N
Rockets are launched into space using
jet propulsion where exhaust accelerates
out from the rocket and the rocket accelerates
in an opposite direction.
Newton’s 3rd law