Explain momentum.
Mass in motion
This term describes the measurement of the force gravity on an object's mass.
What is weight?
Newton's second law states _________ are needed in order for an object to undergo an acceleration
What is an unbalanced force?
Newton's 3rd Law states that forces come in ________.
What is pairs?
A bag of sports equipment has a mass of 30.0 kilograms. What is its weight and normal force on Earth?
300 N and 300 N
In what type of collision do the objects have the same shape as before the collision, and NO energy is lost?
Elastic
Compared to its weight on Earth (g=9.8), the weight of a 10-kg object on the moon (g=1.6) is ___________.
Less
True or False: If an object is pushed with more force, it will move faster, or have a greater acceleration.
What is true?
What is an interaction?
Mutal action between two objects.
Action/reaction forces
This is the weight (NUMBER AND UNIT) of a person whose mass is 55 kg and is standing on planet Earth.
What is 550N ?
According to the law of conservation of momentum, in the absence of an external force, the momentum of a system remains ________.
Unchanged
Identify the action and reaction force.
Foot pushes down on the ground with 50 N
Ground pushes up on foot with 50 N
What is the momentum of a 9 kg bowling ball rolling at 3 m/s?
27 kg. m/s
This is the acceleration of an object that has a mass of 56 kg and is pushed by an unbalanced force measuring in at 140 N. (HINT: You MUST have the correct units in order to get the points!!!)
What is 2.5 m/s^2?
Describe an everyday situation in which we see Newton's Third Law of Motion occuring.
What is (answers vary-must demonstrate forces acting in pairs and equal and opposite to one another).
A soccer ball after Alan kicks it has a coefficient of kinetic friction of μ = 0.35. If the ball feels a normal force (FN) of 4.5 N, what is the frictional force that acts on the ball?
1.6 N
A 3,000 kg car is traveling at 12 m/s when it strikes another 2,000 kg car that is at rest. If the cars lock together, what is the final velocity of the two cars?
7.2 m/s
List the 4 types of friction.
Kinetic, Static, Rolling, and Fluid