Short Answer 1
Why are liquids used in hydraulic brakes instead of gases?
Liquids cannot be squeezed into a small space, so when pressure is applied to a liquid is will be equally applied to the brakes. Air can be squeezed into a smaller space.
Explain how an orbit is formed. You may use drawings to enhance your explanation.
An orbit is formed by forward motion and the free fall of an object toward earth caused by gravity. These two forces combine to create an orbit.
Describe force and its unit of measure
A force is a push or pull that can be expressed in Newtons and can cause an object to speed up.
why will a helium balloon float in the air.
A helium filled balloon will float in air because helium is less dense than air.
what does three curve at the top of the wing do?
The curve at the top of a wing causes air to travel farther in the same amount of time as the air below the wing. This creates a low pressure zone above the wing and helps create lift.
You must move a heavy box that you cannot lift. What are some ways you could reduce friction to make moving the box easier?
You could use wheels, roller, make the surfaces smoother, or use an oil or liquid.
How is it possible to be accelerating and traveling at a constant speed?
Acceleration means a change in direction or speed. If you just change direction, you are still accelerating.
A golf ball and a bowling ball are moving at the same velocity. Which has more
momentum?
The bowling ball because it has more mass.
You are riding your bike on a straight flat road. You cover one block every 7 seconds. If a block is 100 m long, describe your motion
You are riding your bike on a straight flat road. You cover one block every 7 seconds. If a block is 100 m long, you are traveling at a constant speed and velocity.
fluid pressure always flows in which direction
Fluid pressure is always directed in all directions.
Why does friction make observing Newton’s first law of motion difficult?
Newton’s first law states that an object in motion will stay in motion. Since friction opposes motion it cause an object in motion to slow down or stop. Therefore we can’t see an object remaining in motion forever.
Where is water pressure greater, at a depth of 1 m in a large lake or at a depth of 2 m in a small pond? Explain.
Water pressure is greater at a depth of 2 meters in the small pond. The total volume of water does not matter, only the depth determines pressure.
where in the universe could a feather and a rock be dropped at the same time land at the same time.
A feather and a rock dropped at the same time from the same height would land at the same time when dropped by an astronaut on the moon.
when is an object in projectile motion?
An object is in projectile motion if it is thrown with a horizontally push and accelerate downward due to gravity. It cannot accelerate horizontally.
compare the amount of gravity between 1kg of lead and 1kg of marsh mallows
The amount of gravity between 1 kg of lead and 1 kg of marshmallows is the same.
which materials flow and fit into their containers
Materials that can flow to fit their containers include both gases and liquids