Newton's 1st Law
Define inertia.
An object's tendency to resist changes in motion.
What mathematical equation is associated with Newton's 2nd law?
F=m*a
State Newton's 3rd law.
Newton's 3rd law states third law that for every action (force) in nature there is an equal and opposite reaction.
What happens to the strength of the gravitational force as the distance between objects increases?
The strength will decrease.
What are the two ends of a magnet called?
poles
What are the two types of charged particles and their charges?
Protons (positive)
Electrons (negative)
What is newton's first law of motion?
Newton’s First Law of Motion states that an object at rest stays at rest, and an object in motion stays in motion at a constant speed and in a straight line, unless acted upon by an unbalanced external force
A 2 kg cart accelerates at 3 m/s². What is the net force on the cart?
6 N
When you push against a wall, what does the wall do to you?
The wall pushes back on you with an equal and opposite amount of force.
What two factors does gravitational force depend on?
Mass and distance
What happens when two north magnetic poles are brought together?
they will repel
What happens when two objects with opposite electric charges are brought close together?
The objects will attract
A book slides across a desk and eventually stops. What force causes it to slow down?
The force of friction acts opposite to motion.
Two carts are pushed with the same force. One cart has more mass. Which cart accelerates less?
The car with more mass will accelerate less because mass and acceleration are inversely proportional.
When a swimmer pushes water backward, which direction does the water push the swimmer?
The water will push the swimmer forward in the opposite direction.
Why does the sun have a stronger gravitational pull than earth?
The sun is more massive.
What is the region around a magnet where magnetic forces can act called?
magnetic field
How are poles and electrons similar?
Opposites attract, same poles/charges will repel
A soccer ball is sitting still. What must happen for the ball to begin moving?
An unbalanced force must act upon it.
What is Newton's 2nd Law? You must explain the relationship between force and acceleration and the relationship between mass and acceleration.
Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass
When a hammer hits a nail, the hammer pushes on the nail. What force does the nail exert?
An equal and opposite force
If an astronaut travels from Earth to the Moon, how do their mass and weight change?
Mass doesn't and weight decreases on the moon.
List three magnetic and three nonmagnetic metals.
Magnetic: iron, nickel, cobalt
Nonmagnetic: Gold, silver, copper, tin, tungsten, manganese, etc.
What causes lightning?
Charged particles such as electrons moving between cloud layers and the ground.
A car suddenly stops, and passengers move forward. How does inertia explain why their bodies keep moving forward?
Inertia causes the passengers to resist changes in motion. When you are in a car, you and the car are traveling at the same speed in the same direction. When you step on the brakes, the brakes will stop the car, not you.
A 5 kg object experiences a net force of 20 N. What is its acceleration?
4 m/s^2
Give an example of an action /reaction force pair
Answers will vary.
In your own words, explain the difference between your mass and your weight.
Answers will vary.
How can you make an electromagnet stronger?
increase the number of coils around the metal core, add additional batteries to the electromagnet
Roberto is sliding down a plastic slide on the playground. After he reaches the ground, he feels a small electric shock when he touches a piece of metal. What has been built up on his body that causes the shock?
Electrons