As time elapses before the ball strikes the ground, the horizontal velocity is the ball increases, decreases or stays the same?
Stays the same
100
Is force a vector or a scalar?
Vector - it requires a magnitude as well as direction
100
If you double the mass, what happens to the acceleration?
nothing, a is not dependent on m
100
How can you describe what uniform acceleration is?
Also known as constant acceleration; The time rate of change of velocity, a vector quantity, measured in m/s/s
200
A sailboat is traveling north at 10 km/h, relative to the water. The water is flowing north at 5 km/h. What is the velocity of the boat relative to ground?
15km/h
200
What is the path a projectile takes?
Parabolic
200
What is the net force on an apple that weighs 1 N when you hold it at rest above your head?
The net force is 0, because the object is not moving, therefore has no acceleration, therefore F=ma=0N
200
What is one way that the centripetal force can be quadrupled?
double the velocity, quadrupled the mass, or acceleration, 1/4 the radius.
200
Does projectile motion involve constant acceleration?
Yes
300
Starting from rest, an object rolls freely down a 10 meter long incline, in 2.0 seconds. What is the acceleration of the object?
5 m/ss
300
If the height above the ground from which the ball is thrown was increased, the time of flight of the ball would increase, decrease or remain the same?
Increase.
300
A 10N force gives a mass m1 an acceleration a. A 20N force gives another mass m2 the same acceleration. What is the ration of m1 to m2?
m1/m2 = 1/2
300
A 3kg rock swings in a circle of radius 5 m. If its constant speed is 8m/s, what is the centripetal force?
Fc=38.4N
300
A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.
d = vi*t + (1/2)*a*t2
a = 8.10 m/ s2
400
What is happening to the speed of the ball as it is being dropped 30 meter above the ground? why?
speed increases, due to gravity pulling it down
400
A rock is thrown horizontally from the top of a cliff at 12 m/s. Calculate the time required for the rock to fall 45 meters vertically.
t = 3.03s
400
What are the fundamental units for a force of 1N?
F=ma
F=(kg)m/s/s
400
A 1.5 kg cart moves counterclockwise on a radius of 1.3 meters, at a speed of 2 m/s. Determine the magnitude and direction of the centripetal force of the cart.
4.7 N - to the center
400
A car is originally traveling at 15.0 m/s on a straight, horizontal road. The driver applies the brakes, causing the car to decelerate uniformly at 4.00 m/s² until it comes to rest. Calculate the car’s stopping distance.
vf squared=vi squared+2ad
d=28.1m
500
Perform the following operations, and answer it according to sig figs and scientific notation:
3.145 + 2.34 x 19.87
4.96 x 10^1
500
A small missile is fired with a velocity of 300 m/s at an angle of 30 degrees above the ground. After the total flight of time is 30.6 seconds, the missile returns to the level ground. Calculate the total horizontal range of the missile.
7960
500
A crate is to be pulled across the floor. The crate will experience a force of friction of - 34 N. You pull on the crate with a force of 75 N. The mass of the crate is 8.5 kg. What is the acceleration of the crate?
a=4.18m/s/s
500
A cart swinging around a circle of radius of 2 m, has an acceleration of 2 m/s, and the centripetal force is 6 N. What is the mass of the cart?
m = 3kg
500
A car accelerates uniformly from rest to a speed of 23.3 km/h in 8.4s. what is the distance it travels during this time?