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1D
2D
Force
100
A hockey puck slides the length of half an ice rink (30m) in 2.5 seconds. What is its speed during this time?
12 m/s
100
In the following velocity vs. time graph, how far did the object travel in total?
11 meters
100
Vector 'Z', with a magnitude of 8 aims 12 degrees above the horizon. Determine the component vectors of vector Z
X=7.825
Y=1.663
100
You push horizontally on a crate and find that a push of 40N maintains a constant speed of 3m/s.
a) What is the crate's acceleration?
b) What is the net force on the crate?
a) 0 m/s2
b) 0N
200
A bee flies at 9 m/s for 5 seconds. How far did the bee travel?
45 meters
200
A kid rolls a ball through the snow at 3 m/s. It takes 2 seconds for the ball to be at half of its initial speed. What is the acceleration of the ball?
a=(vf-vi)/t
-0.75 m/s2
200
You want to row your boat across a river that is 60 meters wide. The current moves 3 m/s eastward, and you can paddle at 5 m/s. How far downstream will the river carry you (by the time you make it across)?
12s to cross
3*12 = 36 meters
200
A block of mass m = 3.3 kg is being pushed across a rough, horizontal surface by a force of F = 11 N. If the acceleration of the system is 2.5 m/s2, what is the magnitude of the force of friction acting on the block?
Fapp-Ff=ma
Ff= 2.75N
300
Sketch a velocity vs. time graph where an object has a constant negative velocity
300
A small ball is released from a window at t = 0. Assuming free-fall conditions, how far does it travel in 2.8 seconds?
y= vit + ½gt2
y = -38.4 m
300
A cannon, sitting on a 9-meter wall shoots a water balloon at 35 m/s straight out. How far will the water balloon land from the wall?
47.4 meters
300
A cannon (mass = 1800 kg) fires a cannonball (mass = 15 kg). The cannonball accelerates from rest to a speed of 18 m/s in 0.1 seconds. What is the cannon's acceleration as it recoils backward?
aball=180m/s2, F= 2700N
acannon=-1.5m/s2
400
A kid rolls a ball through the snow at 2 m/s. It takes 4 seconds for the snow to bring the ball to a stop. What is the acceleration of the ball?
-0.5 m/s2
400
A car is rolling toward a cliff with an initial speed of 15 m/s. The maximum negative acceleration that the brakes can provide is -0.3 m/s2. If the cliff is 350 m from the initial position of the car, will the car go over the cliff?
vf2 = vi2 + 2ax
x = 375 m
Thus, the car cannot stop in time and goes over the cliff.
400
A projectile with a Vx of 5 m/s is launched 40 degrees above the ground. What was the maximum height of the projectile?
Vo=6.53 m/s, Vy=4.2 m/s
tmax height = 0.43s
max height = 0.898m
400
A 637N person stands on a scale in an elevator. When the elevator accelerates up at 1.2 m/s2, what will the scale read (in Newtons)?
FN-mg=ma
FN=m(g+a) = 715N