Who is the physicist who came up with the famous 3 Laws of Motion?
Isaac Newton
100
What is the equation to calculate speed?
speed = distance/time
100
Define and give the formula for potential energy.
Potential energy is stored energy
PE = mgh
100
What force propelled our model rockets?
air pressure
200
A scalar is a quantity that has
magnitude only
200
What is Newton's 1st Law of Motion?
An object at rest, stays at rest, or an object in motion stays in motion unless acted upon by an outside force.
200
John took 45 minutes to bicycle to his grandmother's house, a total of 4 kilometers. What was his speed in km/minute?
0.08 km/minute
200
Define and give the formula for kinetic energy.
Kinetic energy is the energy of motion
KE = 1/2 mass(velocity)squared
200
While doing playground physics, when you were on the merry-go-round, what was the name of the force that made it follow a circular path?
centripetal force
300
A parachutist jumps from a plane. He has not pulled his parachute yet. His weight or force is 200 N downward. The wind is applying a small drag force of 50 N upward. What is his vector sum?
150 N downward
300
What is Newton's Second Law?
Force = Mass x Acceleration
300
A plane traveled for about 2.5 hours at a speed of 1200 km/hr. What distance did it travel?
(hint: distance = speed x time)
6250 km
300
What is the Potential Energy of a 3kg block 10 m above the floor? (PE = mgh, g=9.8 m/s/s)
294 J
300
What do we call the force that is resistance to motion caused by rubbing?
friction
400
A parachutist opens his parachute. His weight or force 200 N downward, and the drag force is 200 N upward. What is the vector sum?
zero
400
What is Newton's 3rd Law of Motion?
For every action, there is an equal and opposite reaction.
400
How long would it take a car to travel a distance of 200 km if it is traveling at a speed of 55 km/hr?
(hint: time = distance/speed)
3.64 hours
400
What is the kinetic energy of a 20 kg mass at 9 m/s?
(hint: KE = 1/2mass x (velocity)squared)
810 J
400
Describe the action-reaction force pair that occurs when someone is on the swing.
legs pump propelling the person up and forward, and gravinty pulls the person back down.
500
3 girls are pulling a rope at 400 N each to the left , and 3 guys are pulling the same rope 300 N each to the right. What is the vector sum?
300 N to the left
500
How much force is needed to accelerate a 68 kilogram-skier at 1.2 m/sec squared?
81.6 N
500
What is the speed of a car that traveled a total of 75 km in 1.5 hours?
50 km/hr
500
What has more kinetic energy, a 3 kg mass at 5 m/s or a 2 kg mass at 8 m/s?
(Hint: KE = 1/2mass x (velocity)squared
The 2 kg mass has more KE (64 J) whereas, the 3 kg mass has a KE of 37.5 J
500
What is a push or a pull that usually leads to an object changing its motion.