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1
What two factors affect potential energy?
mass/weight and height
1
Is this a speed, velocity, or acceleration?
A roller coaster going down a hill.
acceleration
1
On a roller coaster, as potential energy decreases, kinetic energy ___________.
increases
1
Explain how all three of Newton's laws are demonstrated when two bumper cars collide.
1- Cars don't move until you push the gas
2- The greater the mass of the person in the car, the greater the force when you get hit
3- When two cars collide, both cars get pushed backwards
1
What is the unit for force?
Newton (N)
1
Is this kinetic or potential energy?
A ball rolling down a hill.
kinetic energy
2
If Valentina is traveling 15 km in 45 seconds, what is Valentina's speed?
0.33 km/second
2
What is the mass of a truck (kg) if it produces a force of 1000 N while accelerating at a rate of 5 m/s/s?
200 kg
2
Calculate the speed of the object between points C and D. Round to the first decimal place.
There is no speed. The object is at rest.
2
A hurricane is a huge storm that forms over warm ocean waters. Many hurricanes enter the Gulf of Mexico and move in a northwesterly direction. A hurricane travels a distance of 50 miles in 2 hours. Determine the hurricane's velocity.
25 mph northwest
2
Kyle swings a baseball bat, and the ball pushes on the bat and the bat pushes on the ball. Which law is it?
Newton's 3rd law
2
What does Newton's 3rd law of motion say?
Every action has an equal and opposite reaction
2
What happens to force if the mass of an object increases?
The force required to move the object also increases
3
James stands at the edge of a 4.50 m high half-pipe. The mass of James is 539 N. What is the potential energy of James?
2425.5 J
3
What does Newton's 2nd law of motion say?
Force = mass x acceleration
3
A hawk that has a weight of 8.5 N has built a nest 14 meters above the ground. What is the hawks potential energy?
119 J
3
Chloe who has a mass of 50 kg is skating with a velocity of 5 m/s. What is Chloe's kinetic energy?
625 J
3
What is energy?
the ability to do work
4
What is the unit for energy?
Joules (J)
4
What makes velocity different from speed?
velocity has a direction, while speed does not
4
Is this speed, velocity, or acceleration?
A soccer ball rolling 5 m/s.
speed
4
Energy can not be created or destroyed, only changed in a different form of energy. This is known as ________.
the law of conservation of energy
4
A 10 kg bowling ball would require what force to accelerate down an alleyway at a rate of 4 m/s/s?
40 N
4
Is this speed, velocity or acceleration?
Geese flying north at 12 m/hr
velocity
5
What two factors affect kinetic energy?
mass and velocity/speed
5
Which has a greater inertia, a bowling ball or a tennis ball? Why?
The bowling ball because it has greater mass.
5
What is a reference point?
an object that appears to not move
5
What is inertia?
An object's resistance to change its motion
5
This type of energy is present in a rock at the top of a hill.
potential energy
6
Pushing a child on a swing is easier than pushing an adult on the same swing. Which law is this?
Newton's 2nd law
6
Puneet pulls a tablecloth out from under dishes and the glasses on the table don't move. Which law is this?
Newton's 1st Law
The objects at rest on the table stay at rest
6
What does Newton's 1st law of motion say?
An object in motion will stay in motion or an object at rest will stay at rest unless acted on by an unbalanced force.
6
How much time will it take for a bug to travel 2 meters across the floor if it is traveling at a speed of 1 m/s?
2 seconds
6
Is this kinetic or potential energy?
A ball resting on top of a hill.
potential