Forces
What is a contact force?
Forces that occur through the contact between two objects
What is gravity?
Gravity is a pulling force that works across space.
What is the direction of the force of gracity?
The direction of this force is always pulling one object to another object's center.
Why are seeds important to a plant's reproduction?
They protect the offspring.
They contain food for the offspring.
Offspring grow from the seed.
What is a non-contact force?
Forces that do not require objects to touch.
Do objects need to touch each other for the force of gravity to affect them? Explain your answer.
No. Gravity is a force that acts at a distance.
Gravity creates "action and reaction" forces. How would this make an Object 1 and Object 2 react to one another?
Object 1 pulls on Object 2 with the same amount of force with which Object 2 pulls on Object 1.
A lizard has a short tail that is not helpful in its current environment. What will most likely happen to this lizard?
It will not be as successful as other lizards.
What are the 2 other names for non-contact forces?
Distance forces or field forces.
What is the strongest force of gravity we experience day-to-day
The pull of the Earth.
The force of gravity never ________ pulling on objects.
Stops.
Which of the following changes would likely have the smallest impact on an ecosystem?
A volcano erupting and covering a forest in lava and ash that blocks the sun
The environment getting hotter and rainier every summer, and cooler and drier every winter
Chemicals killing most of the plants in a prairie
The predators permanently leaving an ecosystem because its conditions changed
B is a seasonal change that happens every year. Organisms are adapted to the change.
Give an example of a contact force.
Friction.
The gravity, or pull of the Earth, creates what?
An objects weight.
How does the distance between objects affect the strength of gravitational force?
The gravitational force decreases as the distance between the objects increases.
The A train left Station 1 at 10:00 am. It reached Station 2 at 10:10 am. These stations are 5,000 meters apart.
The B train left Station 3 at 11:00 am. It reached Station 4 at 11:10 am. These stations are 6,000 meters apart.
Which train has a faster speed?
Because train B moved farther in 10 minutes (6,000 m compared to 5,000 m), it was faster.
Give an example of a non-contact force.
Magnetism.
What would happen if Gravity did not exist?
All objects would fly into the space.
How does the mass of objects affect the strength of gravitational force?
The gravitational force increases as the mass of either object increases.
Marty is cleaning out his parents' garage and moving boxes of books by pushing them across the floor. The first box has 5 books, the second box has 15 books, and the third box has 25 books. Each book is about the same mass. Marty pushed each box with the same force.
Which box will likely have the smallest change in speed when pushed and why?
25 books.
Objects with more mass experience less change due to a given force than objects with less mass, which experience more change. Because the box with 25 books has the most mass, it will experience the least change due to his push.