KE and PE
What two factors affect potential energy?
Mass and Hieght
A book is being pulled to the ground, bby gravaity, with a force of 5 N. It is resting(not moving) on the table. What is the amount of normal force acting on the book and in what direction? Draw a force diagram.
Normal Force= 5N
How can one pull a table cloth out from a pile of objects without moving the objects.
Pull the cloth fast and in a downward motion
What is an example of newton's first law of motion?
answers vary
Yeferson has a car that accelerates at 6 m/s² . If the car has a mass of 12,000 kg, how much force does the car produce?
72,000 N
What factor has a greater affect on kinetic energy?
Speed
Two people are moving a box together. One is pulling on the box with a force of 5 N and the other is pushing the box with a force of 8 N.
Draw the force arrow diagram AND calculate the net force on the box.
Net force: 13 N to the __________
Imagine you are trying to destroy a wall with a wrecking ball. On your first try releasing the wrecking ball, it bounced off of the wall and didn’t destroy it.
In order to best improve your chances of destroying the wall, would you be best off:
Doubling the speed of the wrecking ball
What is an example of Newton's Second Law of Motion?
answers vary
What is the acceleration of Brendan’s baseball if it has a mass of 2.5 kg and hits the catcher's glove with a force of 50 N?
8 m/s2
Highest PE= top of first hill
Highest KE= bottom of first hill
Matthew and James are both pushing a box. Matthew is pushing with 10N to the right and James pushes with 20N to the left. Draw a force diagram and find the net force:
10 N to the left
Look at question 11a on the study guide, which coaster will likely work and why?
the coaster who's 1st hill is taller than its other hills because it will have enough PE to convert to KE to complete the track
What is an example of Newton's Third Law of Motion?
Answer Vary
What is the definition of Inertia?
The ability of an object to resist (fight) change in motion
Look at question 12a on the study guide.
At what point on the diagram does the ball have the MOST potential energy? #_____ Explain your answer.
4 because it is the tallest height off the ground
Diana throws a basketball to Breea. Diana throws it with 15N of force to the left. The air resistance on the ball is 2N to the right. Draw a force diagram and find the net force on the ball:
13 N to the left
Look at Question 11b on the study guide, What is likely going to happen in this coaster and how would you fix it? USE UNIT VOCABULARY!
The coaster will crash because enough energy cannot be disappated
If a semi truck and a small car are traveling towards each other at the same speed, what happens when they collide?
The cars hit each other with the same force, but the smaller car sustains more damage because it is a smaller mass.
Imagine a large truck and a small car are both driving with the same speed down a highway. All of a sudden, a deer runs across the road. Which car will be able to stop and avoid the deer?
Explain your answer using Newton’s Laws of motion.
small car because it has less mass
Look at question 12b on the study guide.
At what point on the diagram does the ball have the MOST kinetic energy? #_____ Explain your answer.
spot 7, just before hitting the ground because (almost) all the PE is converted to PE
Ben punches a punching bag with 30N of force to the left. Cooper punches the other side of the bag with 50N of force to the right. Draw a force diagram and find the net force on the bag:
20 N to the right
Why are seatbelts required when riding in a car? Use one of Newton’s Laws to explain your answer. Draw a diagram to explain your thinking.
Seat belts connect the body to the car so that when a force acts on the car, it will act on the body. Without the seatbelt, the body is not connected to the car and will continue to travel at the same speed in the same direction until the body collides with an object.
Why does a roller coaster need different elements, like hills, loops, and spirals, along its track?
The elements are needed to create more friction/ air resistant to dissipate energy so that it comes to a safe stop.
Explain why when you pull one ball on Newton's cradle, the other side has one ball move in the opposite direction using one of Newton’s laws.
for every force, there is an equal and opposite reaction. So the ball hits the next ball with the same force in the same direction until the last ball is hit and it will only go as high as the original ball was pulled.