Newton's Laws
A person is standing in a bus. When the bus starts moving forward suddenly what happens to the motion of the person? Which of Newton's Laws is being followed?
1. The person will move backward.
2. Newton's First Law of Motion
The amount of force needed to keep a 0.2 kg hockey puck moving at a constant speed of 8 m/s on frictionless ice is ___ N
0 N
An airplane travels 1,234 miles in 3 hours. What speed is the airplane traveling at?
411.3 miles/hour
A desk is pushed across the room with a force of 125 N. The carpet provides a frictional force of 50 N. What is the net force on the desk?
75 N across the room.
What is an example of an opposing contact force?
Friction
Air Resistance
What law states that the acceleration of an object is dependent on the objects mass and the amount of force acting on it?
Newton's 2nd Law
Your Scooter has a mass of 2000 kg. If your scooter produces a force of 5000 N, how fast will it accelerate?
2.5 meters per second squared
An boulder has a mass of 350 kg and accelerates down a hill with a speed of 6 m/s/s. What is the net force acting on the object?
2100 N
I throw my kite into the air with a force of 50 N. The wind helps my throw by gusting upward with a force of 125. What is the net force on the kite?
175 N Upward
What is an example of a non contact force?
Gravity
Newton's first law is also known as what?
Law of Inertia
What will fall with a greater force? 12 kg box of feathers or 3 kg box of bricks?
12 kg box of Feathers
A family travels from Missouri to Texas. They cover a distance of 875 miles in 12 hours. What is the car's velocity?
72.9 mph South
Two teams are playing tug of war but no one is moving. What is the net force acting on the rope?
0 N
What is velocity?
The speed and direction an object is moving.
Objects want to remain at rest or in motion. This is an example of what law?
Newton's 1st Law
If the mass of an object increases then the force applied to make it accelerate must __________
On day 1, I biked 20 miles in 2 hour. On day 2, I biked 40 miles in 4 hours. What is my average speed biking?
10 mph
What type of forces cause objects to move?
Unbalanced
What is the unit of measurement for Force?
Newton (N)
A bowling ball and a baseball are rolling at the same speed and are on path for a collision. What will happen when they collide? Why?
Bowling ball will push baseball backwards due to having more mass and inertia.
A bike rider is enjoying his bike ride at a casual pace of 10 m/s. He suddenly sees a bear and increases his speed to 34 meters per second in roughly 6 seconds. How quickly did the bike rider accelerate?
4 meters per second squared.
A leopard is stalking its prey and moving towards the antelope with a speed of 2 m/s. He takes off after the antelope and in 10 seconds has a speed of 22 m/s. What was the acceleration rate of the leopard?
2 m/s/s
A student pulls his desk with a force of 42 N. A friend helps him move his desk by pushing on the desk with a force 66 N. The floor pushes back with a force of 15 N. What is the net force acting on the desk?
93 N
What football team is the best in the NFL?
Dallas Cowboys - OF COURSE!