1-D Motion
The slope of a velocity vs. time graph is the _______.
Acceleration
What is another name for Newton's 1st Law?
Law of inertia
What is Newton's 2nd Law?
F = ma
What is a projectile?
An object which only has gravity acting on it.
The slope of a position vs. time graph is the _____.
Velocity
What does Newton's first law say?
An object at rest will stay at rest and an object in motion will stay in motion unless acted on by an outside force.
What is Newton's 3rd law?
For every action, there is an equal and opposite reaction.
Find the horizontal and vertical components of a vector with a magnitude of 75 at an angle of 57 degrees north of east.
X: 40.85
Y: 62.9
Given a velocity vs. time graph, how can you find the displacement of an object?
By finding the area.
While driving down the road, a firefly strikes the windshield of a bus and makes a quite obvious mess in front of the face of the driver. This is a clear case of Newton's third law of motion. The firefly hit the bus and the bus hits the firefly.
Which of the two forces is greater: the force on the firefly or the force on the bus?
They are EQUAL!
Suppose a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, what is the new acceleration of the sled?
3 m/s2
What is the direction of a vector with an x-component of 35.6 and a y-component of -32.5?
42.39 degrees south of east
A car accelerates from rest to get to 45 m/s in 4 seconds. What is the acceleration of the car in this time segment?
11.25 m/s2
Many people are familiar with the fact that a rifle recoils when fired. This recoil is the result of action-reaction force pairs. Consistent with Newton's third law of motion, the bullet pushes backwards upon the rifle. The acceleration of the recoiling rifle is (greater/smaller/equal) than that of the bullet?
Smaller
A 30 kg chair in motion requires 160 N of force to keep it moving at a constant velocity. What is the coefficient of kinetic friction in this scenario?
0.544
A picture frame is hanging by two strings, each with a tension of 45 N at an angle of 20 degrees from the horizontal. What is the weight of the picture frame?
30.78 N
A boy drops a ball off a cliff straight down and it reaches a final velocity of -15 m/s. How high is the cliff?
11.48 m
A 5 kg box and a 6kg box are touching each other and are being pushed with a force of 35 N. What is the acceleration of the boxes if the coefficient of friction is 0.2?
1.22 m/s2
A spring is 0.40 m long. You hang the spring from a hook and attach a 0.58 kg mass to the other end of the spring. If the length is now 0.48 m, what is the spring constant? Include units.
k = 71.05 N/m
A picture frame is hanging by two strings, each with a tension of 50 N at an angle of 30 degrees from the horizontal. What is the mass of the picture frame?
5.1 kg