final
A ball is dropped from the top of a building. What is the final acceleration?
-9.8m/s2
A ball is dropped from the top of a building. What is the its initial acceleration?
-9.8m/s2
A ball is dropped from the top of a building. What is the initial speed?
0
What is the unbalanced force (or net force) acting on a moving car with a constatnt velocity of 25 m/s (56 mi/h)?
0
What is the net force on a bag pulled down by gravity with a force of 18 newtons and pulled upward by a rope with a force of 18 newtons?
0N
In '1 kg = 2.20462 lb', what is the conversion factor?
1 kg = 2.20462 lb
An object has the mass of 10 kg on Earth. What would be the mass of this object at the surface of this planet?
10 kg
What is the weight of a 1.0-kg mass on the Earth? Choose the closest value.
10N
Imagine there is a planet which has the mass of twice more massive (2𝑀𝐸2ME ) than the mass of Earth (𝑀𝐸=5.97×1024ME=5.97×1024 kg), but its shape and size (i.e. radius) is the same as Earth. Answer the questions below about this planet. What would be the value of the gravitational acceleration at the surface of this planet?
19.6 m/s2
An object has the mass of 10 kg on Earth. What would be the weight of this object at the surface of this planet?
196 N
What is the right scientific measurement of the yardage here?
2.3 yards
On a highway ramp, a car is turning around with a constant speed of 18 m/s. The radius of the ramp is 60 m. Find the acceleration of this car.
5.4 m/s2
On a highway ramp, a car is turning around with a constant speed of 18 m/s. The car has the mass of 1250 kg. What is the force which the car needs to stay on the ramp?
6750 N
On a highway ramp, a car is turning around with a constant speed of 18 m/s.
Centripetal Force
Imagine there is a planet which has the mass of twice more massive (2𝑀𝐸2ME ) than the mass of Earth (𝑀𝐸=5.97×1024ME=5.97×1024 kg), but its shape and size (i.e. radius) is the same as Earth. Answer the questions below about this planet. Which statement below is correct about this planet?
Everything on the planet will fall twice faster than on Earth.
What supplies the centripetal force that keeps the planets in their orbits?
Gravitational Force
A car is moving with a constant speed in linear motion, and travels 80 km in one hour. Which one of the statements below are NOT correct?
If it increases its speed, then the car can travel farther than 80 km in one hour.
Which is true about the acceleration due to gravity?
It decrease wit increasing altitude.
What is true about the constant G?
It is a very small constant.
What Aristotelian idea did Galileo discredit in his fabled Leaning Tower demonstration?
Natural Motion
Which law of physics can explain your answer to the previous problem?
Newton's First Law of Motion - Law of Inertia
What kind of force causes it to move in a straight-line path after the break?
No Force
Which is true of the force pair of Newton's third law?
The two forces act on different objects.
Which statement below is NOT correct about Significant Figures?
To get the most precise results in data analysis, you need to keep all digits (numbers) from calculator as Significant Figures
Which of the statements below is NOT correct in describing science?
When more than two scientific ideas (theories) are conflicted against each other, the scientific principle (or natural law) should be decided after considering very carefully how the resulting principle will affect our environments and society.
You are moving with a CONSTANT ACCELERATION (not zero). Which statement below is NOT correct?
You can stop for a while and start again.
angular momentum is conserved in the absence of
a net torque
what is necessary for change in velocity?
an unbalanced force
what is a possible state of an object in the absence of a net force
at rest, constant speed, and zero acceleration
a net force
can produce motion and change in velocity
A change in linear momentum requires which of the following?
change in velocity, an unbalanced force, and acceleration
For projectile motion, what quantities are constant? (Neglect air resistance.) Choose all.
horizontal Acceleration, Vertical Acceleration, Horizontal Speed
what term refers to the tendency of an object to remain at rest or in uniform straight line
inertia
which is true about the acceleration due to gravity?
it decreases with increasing altitude
what is true about constant G?
it is a very small quantity
According to Newton's second law of motion, when an object acted on by an unbalanced force, what can be said about the acceleration
it is inversely related to an objects mass
If a submerged object displaces a volume of liquid equal to its weight and is then released, what will the object do?
rise to the surface and float
If a submerged object displaces an amount of liquid with a weight less than its own, when the object is released, it will
sink
What is Science?
the study of nature
A child's toy floats in a swimming pool. The buoyant force exerted on the toy depends on the volume of
the water displaced
What do we call the gravitational force between the Earth and your body?
weight
Mass is related to an object's
weight, inertia, and density
Which of the following objects are in uniform motion (in equilibrium)? Choose ALL uniform motions.
A car heading north 35 mph, An airplane cruising at 30,000 feet high at 50 mph, A book resting on your desk
Which quantities below of a solid object on this planet are NOT the same as on Earth? Choose all possible answers.
Acceleration when it falls vertically, weight
Which statement is NOT correct about Einstein's theory of Gravity when it is compared to Newton's theory of Gravity?
According to Einstein's theory, gravitational force could be repulsive as well as attractive, which Newton's theory has only attractive gravitational force.
Find the statement which is NOT correct about Gravity.
According to Newton's theory of Gravity, the strength of gravitational force depends on the weight of objects.
Which one below is NOT correct about Aristotle's work?
Aritotle was very skillful to make various devices, and he use them for his observations and experiments.
Why do we use the decimal number system in Science/Engineering?
Because scientists and engineers decided to use it in their fields.
