Vocab
What is motion?
change in the position of an object over time
If an object is at rest, ____________________.
will remain at rest.
The greater the mass of an object, the more _________ needed to _______________ that object.
force / accelerate
For every action, there is an ________ and __________ reaction.
equal / opposite
Pushing, pressing, pulling, and lifting are all examples of ___________ _________.
applying force
What is applied force?
a force applied to an object by a person or another object
An object in motion will remain in motion unless ____________________
an external force acts on it.
What does the formula F=ma stand for?
Force = Mass x Acceleration
As a ball reaches flat ground, it begins to slow down and then stop. What force is causing the ball to stop?
Friction
As a ball rolls down a hill and begins to move faster, what force is acting upon the ball.
What is friction?
a force in the opposite direction of the motion
The 1st Law of Motion is the Law of _________.
Inertia
Why can't a toddler push a toy car and real car at the same acceleration?
The toddler does not have the mass needed to accelerate a real car.
True or False:
If you blow up a balloon and then release it, the balloon will fly away. This is an example of the 3rd Law of Motion.
True
The force responsible for a feather falling to the ground is __________.
gravity
What is gravity?
the force by which a planet or other body draws objects toward its center.
Why did the tomato sauce spill in the grocery store if it was sitting in boxes on the hand truck?
The man holding it was pulled and moved the hand truck rapidly. The boxes were at rest and wanted to stay at rest, so they crashed to the floor.
A shopping cart is filled partially with groceries. If more groceries are added to the cart, what would need to move the cart at the same acceleration?
A. More force
B. Less friction
C. Less groceries
A. More force
When a collision occurs between two objects of different masses, the motion of the objects will
A. be equal and opposite
B. come to a complete stop
C. differ greatly
C. differ greatly
Which law of motion best explains why a motorist should buckle up while in a car?
The 1st Law of Motion
What are two examples of applied force?
Pushing and Pulling
Why did the cans fly out of the shopping cart "on their own"
They were objects in motion and wanted to stay in motion.
Acceleration depends on what two things?
Force and Mass
Explain how a rocket taking off demonstrates the 3rd Law of Motion
The hot burning gasses move in one direction, while the rocket moves in the opposite direction with equal force.
What best describes an unbalanced force that opposes motion between 2 surfaces?
A. Gravity
B. Friction
C. Acceleration
B. Friction