15 Questions
What is the initial state of the penny in the experiment?
Stationary with balanced forces
What happens to the forces acting on the penny when the card is flicked?
The forces become unbalanced
What is the primary force acting on the penny after the card is flicked?
Force of gravity
What is demonstrated by the marble lab experiment?
It is difficult to achieve a state of rest
What is the purpose of the countdown in the marble lab experiment?
To synchronize the blowing of the straws
What is unusual about an object being at rest?
It is an unusual state of being
What causes the penny to accelerate downwards?
The removal of the normal force
What is Newton's First Law related to?
Unbalanced forces
According to Newton's First Law, what happens to an object at rest?
It will remain at rest
What is the natural state of an object?
To move at a constant velocity
Why does the shopping cart eventually stop?
Due to friction
What would happen to a baseball thrown in space?
It would keep going at a constant velocity
What is the purpose of the mini physics lab?
To investigate Newton's First Law
What happens when you flick the index card in the mini physics lab?
The pennies fall into the mug
What is the unbalanced force that acts on the shopping cart?
Friction
Study Notes
Newton's First Law
- An object at rest remains at rest and an object in motion remains in motion at a constant velocity, unless acted upon by an unbalanced force.
- The natural state of an object is to move at a constant velocity, not to come to rest on its own.
- Friction is an example of an unbalanced force that can stop an object, such as a shopping cart.
Space and Constant Velocity
- In the absence of forces, an object in space will keep going at a constant velocity, almost forever.
- The example of throwing a baseball in space illustrates this concept.
Mini Physics Lab 1
- The lab demonstrates Newton's First Law using an index card, a mug, and pennies.
- When the card is flicked, the penny falls into the mug due to the unbalanced force of gravity.
- The normal force of the card is removed, causing the penny to accelerate downwards.
Balanced and Unbalanced Forces
- Before the card is flicked, the penny has two balanced forces: gravity and the normal force.
- When the card is removed, the forces become unbalanced, and the penny falls.
Mini Physics Lab 2
- The lab demonstrates the difficulty of achieving a state of rest in an object.
- The marble is blown by two people using straws, and it is hard to keep it stationary.
- This shows that an object at rest is an unusual state, requiring an unbalanced force to be applied and then balanced again.
Understand the concept of Newton's First Law, which states that objects at rest remain at rest and objects in motion remain in motion unless acted upon by an unbalanced force. Learn about the natural state of an object and how it behaves in the presence or absence of forces.
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