Speed and Velocity
Acceleration
Gravity and Friction
Newton's Laws
Grab Bag
100
Cam Newton is running at a speed of 5 m/s to the right toward the runway. This is an example of _________.
Velocity (We know Cam's speed AND direction!)
100
What three changes in the motion of an object can cause acceleration?
Increasing Speed Decreasing Speed Change in Direction
100
Name the four types of friction.
Sliding Friction Static Friction Rolling Friction Fluid Friction
100
An object at rest will remain at rest, and an object in motion will stay in motion, unless acted upon by an unbalanced force. This is called _______________________.
Newton's First Law
100
What is the formula version of Newton’s 2nd Law?
Force = Mass x Acceleration (F = M x A)
200
The speed of an object a specific moment in time is its:
Instantaneous Speed
200
We have learned 2 formulas for calculating acceleration. What are they? You need both for a correct answer!
Acceleration = (Final Speed - Start Speed)/Time Acceleration = Force/Mass
200
Name the two factors that affect gravity AND explain the effect they have.
Mass - As mass increases, force of gravity increases. Distance - As distance increases, force of gravity decreases.
200
An object’s resistance to changing its motion is called __________.
Inertia
200
Temisha, Deja and Kenya are fighting over a shirt. Temisha pulls to the right with a force of 3 Newtons. Deja pulls to the left with a force of 8 Newtons. Kenya pulls to the right with a force of 2 Newtons. What is the overall force, which direction is it in, and who wins the shirt?
Overall Force = 8 Newtons - (3 Newtons + 2 Newtons) Overall Force = 3 Newtons TO THE LEFT Kenya wins the shirt!
300
Coach Coates is running across the gym. It takes him 30 seconds (s) to travel 90 meters (m). What is his speed?
3 m/s Speed = Distance/Time Speed = 90 meters/30 seconds Speed = 3 meters/second
300
What does a negative value of acceleration tell you about the motion of an object?
The object is slowing down! (The object's speed is decreasing)
300
You weigh more on Jupiter than you do on Earth. This can be described by _______________.
The force of gravity.
300
Two squirrels are fighting over an acorn. Squeaky pulls the acorn to the right with a force of 3 Newtons. Nutty pulls the acorn to the left with a force of 5 Newtons. What is the overall force on the acorn, and which squirrel gets to eat it?
The overall force on the acorn is 2 Newtons to the left. Nutty gets to eat the acorn!
300
You throw a 2 kg football and it accelerates at 15 m/s^2. How much force did you apply to the football?
Force = Mass x Acceleration Force = 2 kg x 15 m/s^2 Force = 30 Newtons
400
Acceleration is the change in ______________ of an object over time
Velocity
400
A lion is fast asleep when it suddenly smells dinner! 15 seconds later, the lion is running at 45 m/s. What is the lion's acceleration? Don't forget units!!
3 m/s^2 Acceleration = (Final speed - start speed)/Time Acceleration = (45 m/s - 0)/15 seconds Acceleration = 3 m/s^2
400
Units of force are named after _____________________.
Sir Isaac Newton
400
A space shuttle with a mass of 1000 kg accelerates at 60 m/s^2 to the moon. How much force was applied to the space shuttle?
Force = Mass x Acceleration Force = 1,000 kg x 60 m/s^2 Force = 60,000 Newtons Don't forget the units!!!
400
Your family is taking a car trip. You travel 100 km in the first hour of your trip. You then travel 140 km in the following two hours. What is your average speed during the trip?
Average Speed = 80 km/hour Average Speed = Total Distance/Total Time Total Distance = 240 km Total Time = 3 hours Average Speed = 80 km/hour
500
You are collecting your things at the end of the day. It takes you 15 seconds to walk the 20 meters to Mr. Brooks' room to get your math homework. It then takes you 35 seconds to walk 30 meters to your locker. Finally, it takes you 10 seconds to walk 10 meters to say goodbye to Ms. Bock. What is your average speed?
1 m/s Average Speed = Total Distance/Total Time Total Distance = 20 m + 30 m + 10 m = 60 meters Total Time = 15 s + 35 s + 10 s = 60 seconds Average Speed = 60 meters/60 seconds = 1 m/s
500
Read carefully! At the start of his race, Usain Bolt is running fast enough to travel 20 meters in 4 seconds. At the end of his race, 5 seconds later, he is running fast enough to travel 80 meters in 4 seconds. What is his acceleration?
3 m/s^2 Acceleration = (final speed - start speed)/time Final speed = 80 meters/4 seconds = 20 m/s Start speed = 20 meters/4 seconds = 5 m/s Acceleration = (20 - 5)/5 = 15/5 = 3 m/s^2
500
You are trying to move a heavy bookcase with your cousin. At first the bookcase does not move. The force between the bookcase and the floor is called ________________________. You then push a little harder and the bookcase begins to move. Now the force between the bookcase and the floor is called ____________.
Static Friction (when the bookcase IS NOT moving) Sliding Friction (when the bookcase IS moving)
500
You apply a force of 50 Newtons to a 2 kg backpack. What is the acceleration of the backpack?
Acceleration = Force/Mass Acceleration = 50 Newtons/2 kg Acceleration = 25 m/s^2 Don't forget units!!
500
A force of 36 Newtons is applied to a baseball accelerating at 12 m/s. What is the baseball's mass?
Force = Mass x Acceleration Mass = Force/Acceleration Mass = 36 Newtons/12 m/s^2 Mass = 3 kg
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