Science 3EQT
Using the formuls (acceleration= fv-sv/ ft-st), what is the acceleration of the wind if it blows with a velocity of 15 m/s south and five seconds later the wind's velocity is 20m/s south?
1 m/s
Given the formula, (average total distance divided by total time), what is the bird's average speed if it flies 250 m for 25 s.
10 m/s
Given the formula (F=ma), how much force is needed to accelerate 62 kg rider and her 300kg motor scooter at 6 m/s/s?
2,172 kg/s
Use Newton's second law of motion (F=ma) to calculate the average of a 12 kg mass if a force of 45 N acts on it?
3.75 m/s
What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s/s, using the formula (F=ma)
50,000 N
Given the formula (acceleration= fv-sv / ft-st), what is the plane's acceleration from Mobile to Saraland if the plane passes over Mobile with a velocity of 8,000 m/s north and then passes over Saraland at a velocity of 10,000 m/s north, 40 s later?
500 m/s
What is the net force of a combined force of 12 N north with a force of 4 N north?
8 N north
Calculate the mass of an object when a force of 28 N accelerates the object 3 m/s/s
9.3 m/s
According to Newton's 2nd law, if there is an increase in force, what will happen to the accelerationof the object?
Increase
If an astronaut uses a jet of nitrogen to maneuver in space , what law is illustrated as the nitrogen expells?
Newton's third law
SI unit for pressure
PA
The reason you blow round bubbles and not square ones are explained in what principle?
Pascal
If an astronaut throws a ball in space, when will the ball stop?
ball will continue in motion
What type of activity best demonstrates Newton's third law of motion?
bumper cars
What does Newton's second law of motion state about an objects acceleration?
direction of force
What does a single pulley change on an object?
direction of force
When a machine increases the size of the force exerted, what happens to the distance through which the force is exerted?
distance gets longer
What volume of fluid does an object displace?
equal
According to Newton's third law of motion, when a force is exerted on an object what does a second force produce?
equal forces
Why do you not notice atmospheric pressure on your body?
equal to your body
How do gases and air flow?
evenly
A student kicks a 0.7 kg ball. She the kicks a 70 kg rock with the same force. What can be said about the acceleration of the ball as compared to the rock.
farther and faster
Which of Newton's laws explains inertia?
first law
What type of friction is air resistance also known as?
fluid friction
What causes the napkins to stay on the picnic table even though there is a slight breeze?
friction
What is the force that opposes motion between two surfaces that are touching?
friction
In what direction does gas exert pressure?
from high to low
What is the term for a slanted surface used to raise an object?
inclined plane
According to Newton's Laws, when the brakes are suddenly applied to a moving vehicle, what causes a person to continue to move forward in his seat?
inertia
If the driver of a car suddenly makes a sharp turn, why will the passanger slide to the side?
inertia
What factor explains the tendency of all objects to resist any change in motion?
inertia
When the brakes are suddendly applied to a moving vehicle, what causes a person to continue moving forward in his seat?
inertia
Why do hydraulic devices use liquids instead of gases?
liquid cannot be compressed
A construction worker is given 4 hammers of different lengths. Which hammer would have the greatest mechanical advantage?
longest one
What is the SI unit for speed?
m/s
A student wants to lift a heavy box. She has 4 pulleys and a 18 m rope. which arrangement would have the greatest mechanical advantage?
one with most string
What type of friction is responsible for a car's tires wearing away, making them very smooth, after several thousand kilograms?
rolling friction
What type of simple machine is a jar lid?
screw
How would you describe the input force and distance of a screw?
small input force long distance
What is being calculated if 9.6 km (distance) is divided by 2.5 hr (time)?
speed
According to Newton's first law of motion, what will a moving object that is not acted on by an unbalanced force do?
stay in motion
Two bicyle ramps have the same height. The first ramp is twice as long. Why does the first one have a greater mechanical advantage?
the longer the better
What would happen if astronauts didn't wear pressurized air suits in space?
they would explode
Which of Newton's laws states that for every action there is an equal and opposite reaction?
third law
What is needed to calculate an objects acceleration?
velocity and time
What type of simple machine is an inclined plane with one or two sloping sides?
wedge
An ice cube is dropped in a glass of water that is filled to the top. The ice cube causes some of the water to overflow. What is the true weight of the displaced water?
weight is equal
Air is made up of gases, but it can be called a fluid. Why is an airplane able to fly within this fluid? (Principle)
Bernoulli
All objects accelerate toward th Earth at a rate of 9.8 m/s/s. What is the effect on velocity for every second that an object falls downward?
9.8 m/s
Due to projectile motion, where should Mr. Smith aim when shooting at the target.
Above target
Whats factors causes a change in acceleration?
Velocity and time