Speed/Velocity/Acceleration
Anthony walks to the pizza place for lunch. He walk 1 km east, then 1 km south and then 1 km east again. What distance did he cover? What was his displacement?
Distance: 3 km
Displacement: 1 km
What would be a consequence if normal force did not exist.
Gravity would slowly pull all things toward the center of the earth.
There would be no collisions, things would just fall through everything and float around
True or False: inertia is not a property of matter and an object has to be in motion to have it
false: inertia is the tendency of an object to resist change
How are momentum and inertia different?
Momentum is the amount of motion in an object, objects have to be moving in order to have momentum.
Inertia is a property of matter and is the idea that objects wants to continue doing what they're doing in the direction they're doing it.
True or false: dung beetles skeleton's are on the outside of their body.
true all beetles have an exoskeleton
If you run at a constant speed and drop M&Ms consistently as you go, what can you expect the trail behind you to look like?
a straight line of evenly spaced M&Ms.
Can an object still be in motion if the net force acting on it is 0N. Explain.
Yes, the object is moving at a constant rate.
You participate in a belly flop contest and later notice that your stomach is red. Which law is this?
3: every action has an equal and opposite reaction
The water applies an equal and opposite force back onto you
A 0.14 km baseball is thrown in a straight line at 30m/s. What is the momentum of the baseball?
4.2 kg x m/s
What is the study of hematology?
The study of blood
A car is traveling at a constant velocity. What does that tell you about it's acceleration?
It's acceleration is 0. Acceleration is a change in velocity (speed and/or direction)
A 50 kg skater pushed by a friend accelerates 5 m/s. How much force did the friend apply?
force = mass x acceleration
force = 250 N
The moon has been orbiting the earth for billions of years. The force that the moon experiences is LESS THAN/EQUAL TO/GREATER THAN the force that the earth experiences. The moon experiences acceleration LESS THAN/EQUAL TO/GREATER THAN than the acceleration of the earth.
equal to / greater than
A stationary boulder has a mass of 8500g. How much momentum does the boulder have?
none, it's not moving
Which planets can have diamond rain?
Neptune, Uranus, and Saturn due to the extreme pressure.
*on paper*
A dino is moving right along and leaves droppings behind him. Look at the 3 scenarios in the handout, and explain the motion of the dino and if the forces are balanced or unbalanced.
a. accelerating, forces are unbalanced
b. constant speed, forces are balanced
c. slowing down, forces are unbalanced
A bear stands on it's hind legs and pushes a tree over. The bear applies a force of 10,000 N. The normal force pushes back with 2,000 N but is overcome. Draw a free-body diagram of the situation, and find the net force.
Net force: 8,000 N to the left
The tree falls
*on paper*
Look at the free body diagram and solve for the missing value.
a = 2.6 m/s2
An 8 kg bowling ball is rolling in a straight line to the left. If its momentum is 16 kg x m/s, how fast is it traveling?
2 m/s left
Which animal poops in a cube shape?
Wombat
A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car’s average acceleration.
10 m/s2
Draw a free body diagram of a rightward-moving car skidding to a stop across a roadway. Label your forces.
Ignore air resistance.
check answers
What does it mean when acceleration and mass are inversely related?
The more mass an object has the more force you need to accelerate it.
The car stops abruptly and due to inertia you will keep moving until you come to an abrupt stop with a high impact. Airbags distribute the force applied on your body over time and increase the time it takes to stop your momentum.
Hippos can only hold their breath for up to 5 minutes but they can the sleep underwater. How?
Yes, they have a reflex that allows them to bob up to the surface and sink back down without waking up