Newton's First Law
Newton's Second Law
Newton's Third Law
Collisions
Vocab
100
What is newtons first law?
An object at rest remains at rest unless acted upon by an outside force. An object in motion remains in motion unless acted upon by an outside force. (Inertia)
100
What is Newton's second law?
F=ma
100
What is newtons third law?
For every action there is an equal and opposite reaction.
100
An air hockey puck crashed into two different paddles. The puck's mass was the same for both crashes. One paddle (red) had less mass, and the other (purple) had more mass. In which crash did the puck experience a stronger force? Why?
The puck that collided with the purple paddle.
100
What is a force?
A push or a pull on an object
200
What can a force do?
start, stop, change direction, speed up, slow down
200
T or F: It takes more force to push an empty shopping cart than a full one.
False
200
A book pushes down on a table with a force of 5N, the table. What force does the table exert?
pushes back with a force of 5N
200
Engineers are modeling two car crashes. The green car has the same mass in both tests. Crash 1: The car hits a heavier garbage truck. Crash 2: The car hits a lighter pickup truck." In which crash did the green test car experience a stronger force? How do you know?
Crash 1: there is more mass involved.
200
What is acceleration?
Speed up, slow down, change direction
300
Which type of force will cause a change in an object’s motion?
unblanced force
300
What does F=ma mean?
Force equals mass time acceleration
300
Give an example of Newton's third Law
You jump on a trampoline. It springs you back into the air.
A swimmer pushes against a pool wall to begin swimming a lap.
A rocket’s thrust pushes it out of Earth’s atmosphere
300
Scientists modeled two crashes using the same satellite. Crash 1: The satellite hits a heavier black asteroid. Crash 2: The satellite hits a lighter gray asteroid. In which crash does the satellite experience a stronger force? How do you know?
Crash 1: more mass!
300
What is the measurement of force?
Newtons (N)
400
True or false: A truck has more inertia than a skateboard; needs more force to move.
True
400
A 20 kg wagon accelerates at 4m/s2, what is the force?
F=(20kg)(4m/s2)
F=80N
400
T or F: All forces occur in pairs.
True
400
Which of newton's laws apply in the collisions?
All of them
400
What is momentum?
a measure of how difficult it is to move the object.
500
Draw an example of a balanced and unbalanced force
500
A batter hits a baseball with 500 N of force, the ball is accelerated at 25 m/s2. What is the ball’s mass?
F=ma
500N=m(25m/s2)
20kg=m
500
According to Newton’s Third Law, when you lean on a wall, which force is greater?
The walls force
500
Three curling stones were pushed from different directions. The yellow and purple stones have the same mass and are heavier than the gray stone. Which curling stone(s) experienced the strongest force? How do you know?
Yellow and purple, same mass, same change in speed.
500
What is the law of conservation of momentum?
Momentum of two objects before the collision is equal to the momentum of the two objects after the collision.