Speed, Velocity, & Acceleration
This is the main difference between speed and velocity.
What is velocity is a vector whereas speed is a scalar?
Newton's first law tells us that:
An object at rest stays at rest and an object in motion stays in motion, unless acted upon by an outside force.
Projectiles travel in the shape of a:
Parabola
Vectors are different from scalars in that they have:
A direction
An object that is not accelerating has this as its net force.
Acceleration describes the change in two things, each you give is worth 100 points.
What is velocity and direction?
Newton's second law is described by this equation.
What is F=ma?
Projectiles accelerate in the y direction at this rate.
What is -9.8 m/s/s or -g?
Give the coordinate form of the sum of the vectors A(1,-2) and B(3,5).
What is (4,3)?
2.75 m/s/s
If it takes a car 9 seconds to go from 0 m/s to 22 m/s this is that car's acceleration.
What is 2.4 m/s/s?
If an object is falling for 1.5 seconds what should its velocity be?
14.7 m/s
If a football is kicked at 16.5 m/s at 50 degrees what is its total time spent in the air?
What is 2.6 seconds?
Convert the vector C(5,2) from coordinate form to angle-magnitude form.
What is (5.4, 21.8 degrees)?
Draw a free body diagram for a skydiver at terminal velocity with a mass of 83 kg. Label the magnitudes of your forces.
f(g) = 813.4 N down
f(d) = 813.4 N up
If it takes your uncle 13 minutes to drive to the store, he spends 3 minutes shopping, and 14 minutes to drive back home and the store is 21 km away. What was his average velocity over that 30 minute journey?
What is 0 m/s.
What is the momentum of a 7 kg object that has been in freefall for 2.25 seconds?
154.35 (kg*m)/s
What is the range of a dinner roll tossed at 8 m/s at 35 degrees along a flat surface?
What is 6.1 m?
Give two examples of measurements we have talked about this unit that are vectors and two that are scalars. (100 points each)
Answers vary.
Draw a free body diagram for a 850 kg cow standing on a plane with a rightward acceleration of 2.6 m/s/s if the plane has a friction coefficient of 0.12. Label the magnitudes of the forces and give the net force on the cow.
f(g)=8330 N
f(N)=8330 N
f(f)= 999.6 N
f(a)=2210 N
f(net)= 1210.4 N to the right.
On a graph of velocity vs time the slope of this graph represents the ______________ and the area under the curve represents _____________. (250 points each)
slope -> acceleration
area under curve -> change in position (distance traveled)
What is the mass of an object that accelerates at 1.97 m/s/s after 163 N of force are applied?
82.74 kg
What is the total displacement of a soccer ball with an initial velocity of 12 m/s at an angle of 29 degrees after 0.5 seconds?
5.5 m
Give the sum of the vectors D(3.16, 71.57 degrees) and E(2.83, 45 degrees) in coordinate form.
What is (3,5)?
What must the acceleration to the left be of a 1.5 kg box that is experiencing a leftward force of 2.5 N on a table with a friction coefficient of 0.01?
1.57 m/s/s