Calculation
Calculation
Formula
Law
Understanding
100
What is the resultant force?
20 N<--- o ---> 20
0 N
100
What is the resultant force?
o --> 20 N
------> 60 N
80 N
100
What is the formula of momentum?
p=mv
100
What is the second newton law?
When a net force acts on an object, the acceleration of an object is directly proportional to the magnitude of the net force
100
When a heavy football player and a light one run into each other, who exerts more force?
It equal each other
200
What is the distance a ball falls after 1,2,3,4,5 seconds (assume g is rounded to 10 m/s2)?
10 m/s, 20 m/s, 30 m/s, 40 m/s and 50 m/s
200
Determine the momentum of a 60-kg halfback moving eastward at 9 m/s?
•p = m*v = 60 kg*9 m/s
p = 540 kg•m/s, east
200
What is formula of buoyancy force
200
What is buoyancy law?
an upward force exerted by a fluid that opposes the weight of an immersed object.
200
How can you explain that we have a stronger gravitational attraction with Earth than the Sun?
Closer to center of Earth
300
What is the moment of force, if mass is 10 kg and distance is 5 m?
500 N*m
300
How many volume of box? if the difference of water level in glass 10 mL
10 cm3
300
what is equation of change momentum?
change of momentum = mass * change of velocity
300
what is law of conservation of momentum?
does not change as the system evolves over time.
300
If M1 is moving forward u1 m/s and hitting with M2 stay at rest, When bumper lock and the cars move forward together. What is their final velocity?
v=v1=v2
400
An object weighs 500 N. It displaces 150 N of water. While in water, the object's weight is.......
350 N
400
What is kind of friction, direction and magnitude of force if we pull a box with 50 N but the resultant force show only 25 N to the right?
kinetic friction go to the left with 25 N
400
What is formula to find a weight?
F=mg
400
What is free fall?
free fall is any motion of a body where gravity is the only force acting upon it.
400
How are mass and weight different?
Mass is the amount of matter in an object; Weight is the amount of gravitational force acting on the object
500
A 10kg ball moving at 12m/s strikes a second ball at rest. After the collision the 10kg ball is moving with a velocity of 3m/s and the second ball is moving with a velocity of 6m/s. What is the mass of the second ball?
15kg
500
A 2250 kg car traveling to the west slows down uniformly from 20.0 m/s to 5.00 m/s. How long does it take the car to decelerate if the force on the car is 8450 N to the east?
4 s
500
What is the formula of moment of force in see-saw?
Total Moment of force anti-clockwise = Total moment of force clockwise.
500
What is the first newton law?
An object at rest will remain at rest unless a nonzero force acts on the object.
500
If a baseball and a cannonball are dropped from the same height at the same time, which ball will hit the ground first?
their hit the ground in a same time