Newton’s 1st Law
What is Newton’s first law of motion?
An object in motion with stay in motion/an object at rest will stay at rest, unless acted on by an unbalanced force.
What is Newton’s 2nd Law of motion?
F =ma
What is Newton’s third law of motion?
Every action has an equal and opposite reaction.
What is mass?
The amount of matter an object has
A magician pulls a tablecloth out from under dishes and the glasses on the tables don’t move.
Newton’s 1st Law
What is inertia?
An object’s tendency to resist change in its motion.
What is the unit for force?
Newtons
When you jump, who pushes harder - you or the ground?
You and the group both push equally!
What is magnitude?
The amount of something
A person not wearing a seatbelt slams their head on the front dash of the car when someone slams on the breaks.
Newton’s 1st Law
Which has greater inertia, a bowling ball or a tennis ball? Why?
The bowling ball - greater mass
Explain what F, m, and a stand for in the equation.
F = force
M = mass
A = acceleration
If you place an object on a table, and it is being pulled with 24N, how is the object not moving down?
The table pushes back upon the object with 24N of force.
What is friction?
A force that resists sliding when two object rub together.
A baseball player swings the bat and hits the baseball, hitting a home run.
Newton’s 3rd Law
If you are running away from a bear, should you run in straight line or a zigzag pattern? Why?
Zigzag pattern because the bear has greater inertia and it’s harder for the bear to change direction.
What happens to force if the mass of an object increases?
It increases.
A soccer player kick a ball with their foot and their toes are left stinking. Why?
Action: kicking the ball
Reaction: ball pushes back and makes toes sting
What is acceleration?
A change in an object’s velocity
(Speed up, slow down, change directions)
Pushing a child on a swing is easier than pushing an adult on the same swing.
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, flick the card, and the quarter will fall in the cup.
An object’s tendency 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 larger 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
Explain how the egg drop project related to all three laws of motion.
1st law: the object will keep falling until the ground stops it
2nd law: the heavier the device, the more force it will hit the ground with because of more mass.
3rd law. The egg could break because as the device hits the ground, the ground hits back on the device with the same amount of force.
Rockets are launched into space using jet propulsion.
Newton’s 3rd Law