Kinematics
What is acceleration due to gravity near the earth’s surface in m/s/s?
g = 10 m/s/s
What is a vector quantity?
A vector has magnitude and direction
What is the reaction force when a bat hits a ball with 30 N of force?
The ball pushes the bat with 30 N of force
What is the unit of mass?
What are the three layers of the Earth?
Crust, mantle, core
It takes an object 5 seconds to fall to the ground. How fast was it going when it hit the ground?
50 m/s
Explain, using forces, why after you a push a shopping cart and let it go, it slows down.
Friction and air resistance act on the cart
What two factors determine the momentum of an object?
Mass and velocity
What is the unit of speed and velocity?
meters per second (m/s)
What is the largest desert in the world?
Antarctica
An object accelerates at 40 m/s/s for 8 seconds. What is its speed if it started at rest?
320 m/s
What is the difference between mass and weight?
Mass is the "stuff" or matter that makes up an object. Weight is the force of gravity. For example, mass stays the same but weight changes if you went to the moon.
When a cannon fires a cannonball, why does the cannonball accelerate forward faster than the cannon moves backward?
The cannon and cannonball receive the same amount of force, so with a smaller mass the cannonball accelerates faster.
What is the unit of force?
What planet is closest in size to Earth?
Venus
Over the course of a day, a bug flies 10 m in 1 hour. It then travels 12 m in 1.5 hours to its next stop. Finally, it travels 13 m in 2.5 hours. What is the average speed of the bug?
7 m/s
What is the net force of a skydiver who has reached terminal velocity?
A bug and a bus collide, how will their total momentum after collision compare to their momentum before collision?
The same. Momentum before the collision = Momentum after the collision
What is the unit of acceleration?
meters per second per second or meter per second squared (m/s/s)
How many bones are in an adult human body?
206
What does a curved line on a position vs time graph mean?
Acceleration
Draw a free body diagram of a 100 N shopping cart being pushed left with 50 N of force with 10 N of friction.
Checked by Ms. Minnebo
Describe why airbags, crumples zones, and seat belts make a car safer.
Airbags, crumple zones, and seat belts increase the time in a collision which reduces the force.
What is the unit of momentum?
kilogram meter per second (kgm/s)
What are the four most common elements in the human body?
By mass, about 96% of our bodies are made of four key elements: oxygen (65%), carbon (18.5%), hydrogen (9.5%) and nitrogen (3.3%).