Distance, Displacement, Speed
If I travel 10 meters to school then 5 meters to the park then 15 meters back home, what is the total distance traveled?
30m
What unit if net force measured in?
Newtons (N)
When you rub a wood block over sand paper what type of force are you applying?
frcition
What unit is energy measured in?
Joules (J)
What types of simple machine is a wheel chair ramp?
Inclined plane
What is the displacement if I run 20 meters left then turn around and go 5 meters right?
15 m left
What is the net force on a box if two people are pushing forward on it.
person 1 = 10 N
person 2 = 30 N
40 N forward
At what rate do all objects fall towards Earth?
9.8 m/s^2
What is the difference between kinetic and potential energy?
kinetic = moving
potential = stored
What type of simple machine is a sea saw?
Lever
What is the speed formula?
and the correct units of each variable in the formula?
speed = distance / time
speed = m/s
distance = m
time = s
What is the net force on a box if I am pushing 50 N to the left and Ms. Sample is pushing 40 N right?
10 N left
Using Newton's 2nd Law, calculate the force I have to apply to accelerate a 75 kg wagon 25 m/s^2
1,875 N
What is the KE formula and what do all the variable stand for and the units?
KE= 1/2 mv2
KE= kinetic energy (J)
m = mass (kg)
v = velocity/ speed (m/s)
Where on a roller coaster is your PE the highest?
At the top of the biggest hill
What is my speed if I travel 537 meters in 128 seconds?
4.19 m/s
State Newton's First Law
an object in motion stays in motion unless acted upon by an outside force
Which would go further? A person roller skating on ice or on sandpaper?
The person skating on ice
What do all of the variables in the PE formula stand for an the units?
PE = mgh
PE= potential energu (J)
m = mass (kg)
g = gravity 9.8 m/s^2
h = height (m)
What two things does the KE formula depend on?
What 3 things does the PE formula depend on?
KE = mass and velocity
PE = mass, height, & gravity
What distance did I travel if I have a speed of 75 m/s and traveled for 800 seconds?
60,000 meters
State Newton's 2nd & 3rd Law
2nd = The force acting on a moving object is the product of the mass times acceleration
3rd = For every action there is an equal and opposite reaction
What does the Law of conservation of energy say?
That energy cannot be created or destroyed?
What is the kinetic energy of an object that is 75 kg and moving with a speed of 25 m/s
23437.5 J
294,000 J