Force and Motion
Fill in the blank:
For an object to change motion there must be a(n) _________________ force applied to it
Unbalanced
I decided to take a trip to the beach this weekend. I live 20 km away from the beach and it took me 30 minutes to get there. Calculate my speed in km/h.
40 km/h
What is the standard unit for acceleration?
m/s2
If a coffee cup is at rest on a table, and I quickly pull the handle to move it, the coffee inside the cup will spill out. Which of Newton's laws is in action in this scenerio?
1st Law
What is the standard unit for speed?
to double your points:
What is the formula to calculate speed?
Speed= Distance/Time
When deciding if an object is in motion, it is important to compare the object to a reference point. If I am driving down the road at 40 mph, I am NOT in motion in reference to my car. Name a reference point I could compare myself to so I could say I am in motion.
The road, a telephone pole on the roadside, A tree on the roadside, etc.
I want to take a trip to Disney World. Throughout my trip I drove
40 miles in 0.5 hours
60 miles in 1 hour
50 miles in 1 hour
100 miles in 2 hours
150 miles in 2.5 hours
and 100 miles in 1 hour.
Calculate the average speed of my trip.
62.5 mph
How can we define "force"
any push or pull
I am deciding to rearrange my living room. My couch weighs approximately 150 kg. I try to move the couch with a force of 100N and it does not move. I ask my friend to come and help me move it. They also push the couch with a force 100N and we finally got the couch to move. Which of Newton's laws is shown in this scenario?
2nd Law
What are the two factors that affect the strength of gravitational pull?
Mass and Distance between objects
Explain why whether or not an object is in motion is considered to be "relative".
We use reference points to determine if something is in motion compared to a reference point.
A ball is kicked across a field with an acceleration of 5 m/s2. The ball was kicked with a force of 10N. Use the formula from Newton's 2nd Law to calculate the mass of the ball in kg.
2 kg
Which vocabulary word is defined as "an object's change in position" ?
Motion
When swimming in a pool, I use my legs to push off the wall to give myself more speed. My legs are pushing against the wall, and the is pushing back on my legs to give me that boost. Which of Newton's laws is in action here?
3rd Law
The Moon and Sun's gravitational forces both play a role in controlling the tides on Earth, however, the moon's gravitational pull plays a much larger role. Explain why that is the case based on what you know about gravity,
Mr. Kern and Ms. Carson's classes decide to play a game of tug of war. Mr. Kern has 20 students in his class and each student is pulling the rope with a force of 5N. Ms. Carson has 25 students in her class, and each student is pulling the rope with a force of 4N.
What is the net force being applied to the rope? And, is this an unbalanced or balanced force?
0N
Balanced
If I push a cart with a force of 20N, and the cart has a mass of 15 kg, what would the acceleration of the cart be?
1.3 m/s2
What is the difference between speed and velocity?
Velocity includes speed AND direction
Me and my friends decide to go to fun warehouse to roller-skate one day. As I am rollerskating, I start to gain a lot of speed. I decide to slow down, I am going to stop skating and let myself come rolling to a stop. Unfortunately, I was going to fast and end up hitting the wall to stop myself. Which of Newton's Laws is displayed here?
1st
What is the SI unit for weight?
(hint: it is not lbs.)
Newtons (N)
Ms. Carson is trying to push a box across her room with a force of 10N to the right. She needs some help getting the box across the room, so Mr. Kern helps by applying a force of 20N to the right. What is the net force acting on the box?
30 N to the right
Object A is pushed with a force of 5N and has an acceleration of 10 m/s2
Object B is pushed with a force of 25N and has an acceleration 20 m/s2
Which object has more mass?
Object B
What are the three ways an object can accelerate?
Speed up
Slow down
Change direction
Ms. Carson decides to prank Mr. Kern by rearranging his classroom. She starts pushing on the tables to move them but it is taking her too long and Mr. Kern might come back if she doesn't hurry! She decides to ask Ms. Myers to help her by pushing the tables with her. With Ms. Myers force + Ms. Carson's force, they are able to accelerate the tables more quickly before Mr. Kern gets back. Which of Newton's laws is displayed in this scenerio?
2nd Law
What is the difference between weight and mass?
Mass= measure of the amount of matter in an object
Weight= The force of gravity acting on an object