Use the Force
A push or a pull on an object
Force
The Metric unit for force is ___
Newton
Which of Newton's Laws explains why pushing your foot back to make a skateboard go forward
Law 3: Equal and Opposite Reactions
Vectors describe the ____ and ____ of force or velocity an object.
Magnitude and Direction
What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?
15 Newtons
When the forces on a moving object are balanced, the object will
Stay the same
The force of gravity on an object is the object's ___.
Hint: on the moon there is less gravity, so if you measure yourself, what will change?
Weight
Which of Newton's Laws explains why a falling bowling ball is harder to catch than a falling tennis ball.
Law 2: F=ma
Which of the following objects is NOT accelerating?
a. A bicyclist increasing speed down a hill.
b. A child riding a merry-go-round at 3.5 m/s.
c. A woman walking 2.3 m/s down a straight street.
d. A satellite orbiting earth at 65.7 km/s.
C
What is the speed of a jet plane that flies 7200 km in 9 hrs?
800 km/hr
When multiple forces are acting on an object in the same direction, you have to _______ the vectors to find the resultant force
Add
The force caused by a liquid is called _______
Hint: the deeper you go into the ocean, the more you will feel this
Pressure
Which of Newton's Laws explains why the passengers in a car will continue to move forward in a crash, until stopped by the seatbelt.
Law 1: The Law of Inertia
What is the formula for velocity?
Displacement / Time
A diver jumps from a high-dive platform into a pool. After 3 seconds she is traveling at 39 m/s. What is her acceleration?
13 m/s2
The support force that is perpendicular to the surface of contact. Aka. The opposite force to gravity for an object that is not falling
Normal Force
Force that rotates an object around an axis, fulcrum or pivot.
Torque
The tendency of an object to resist a change in motion is called what?
Inertia
What is the most common frame of reference?
Earth
A car merges onto a busy interstate. The car is pulling onto the interstate traveling at 16 m/s. Sixty seconds later the car is passing other vehicles at a speed of 36 m/s. What is the acceleration of the car?
0.33 m/s2
The total net force applied on an object is called the _____. This is determined by adding or subtracting all the vectors for the individual forces.
Resultant
What does 9.8 m/s2 represent?
The force of Gravity/ acceleration due to gravity
Assume there is no air resistance. If you dropped a feather and a hammer at the same time from the top of the school, which would hit the ground first?
They would land at the same time
_____ is the object's speed in a certain direction.
Velocity
A tsunami caused by an earthquake occurring in Alaska in 1946 consisted of several huge waves, which were found to travel at the average speed of 790 km/hr. The first of the waves reached Hawaii 4.5 hours after the earthquake occurred. From this data, calculate how far the origin of the tsunami was from Hawaii.
3555 km