Forces
Momentum
Mass vs. Weight
Inertia
Other
100
Unbalanced forces cause?
Acceleration
100
What is Newton's 3rd Law of Motion?
Every action force has an equal and opposite reaction force.
100
What is the definition of mass?
The amount of matter in an object
100
Which has more inertia, a bowling ball or notebook?
Bowling ball, because it has more mass.
100
What is speed? And how is it different from velocity?
Speed is distance over time and velocity is a vector so direction matters.
200
If you have two objects with different masses and you apply the same force to them what will you notice about their acceleration? How do you know?
The object with the smaller mass will have a greater acceleration. Can be seen using Newton's second law of motion F=m x a
200
A ball has a mass of 1.5kg and has a velocity of 2m/s. What is the balls momentum?
What is 3kg x m/s
200
What is weight?
weight = mass x acceleration due to gravity
200
Which has more inertia the ball being thrown at 6m/s or the ball being thrown at 2 m/s?
They have the same amount of inertia because inertia is based on mass only.
200
What is the definition of acceleration? And what are the three ways an object can accelerate?
Acceleration is change is velocity over change in time. Speed up, Slow down, change direction
300
How much force must you apply to an object that has a mass of 4kg to accelerate 2m/s/s? (You must show ALL work.)
8 N F=m x a F = 4kg x 2m/s/s F= 8N
300
What is momentum? (include the equation)
The measure of mass in motion. Momentum is mass times velocity. p=m x v
300
Your __________ is different in space than on earth. Why?
Weight. There is less gravity.
300
What is the definition of inertia?
The resistance of an object to a change in its motion.
300
What is the speed of a car that travels 50 meters in 10 seconds? (Show all work.)
5 m/s S=d/t S=50m/10 s S=5m/s
400
What is the acceleration of a 5kg object when a force of 20 newtons? (Show all work.)
a= 4m/s/s F=m x a 20N= 5kg x a 20/5= 4m/s/s
400
Explain why the balloons from our balloon races moved.
The action force of the air coming out of the balloon cause an equal and opposite reaction force of the balloon moving forward.
400
If an object has a mass of 80kg what is its weight on Earth?
800 newtons
400
What is Newton's 1st Law of Motion?
Objects at rest remain at rest and objects in motion remain in motion with the same velocity, unless acted upon by an unbalanced force.
400
Which has more momentum, a 2kg ball moving with a velocity of 3 m/s, or a 4 kg ball moving at 1 m/s? (hint: use the momentum equation).
*Ball 1: Ball 2: p=mv p=mv p=2kg x 3m/s p=4kg x 1m/s p= 6kgm/s p=4kgm/s
500
If an object has balanced forces acting on it, what do we know about how it is traveling?
Balanced forces cause constant velocity, the object will not accelerate.
500
What is conservation of momentum and give an example.
The total momentum of a system of objects does not change, as long as no outside forces are acting on that system. Newtons cradle transferring the momentum from one ball to the others.
500
What is the mass of a 50kg object in space and how do you know this?
50kg, mass does not change in space because it is not gravity dependent.
500
Using the words inertia and unbalanced force. Explain why when you slam on the breaks in car your body lurches forward.
When you slam on the brakes in a car you are applying an unbalanced force to the car, which results in the car accelerating (slowing down). Because of inertia, the resistance to an object to a change in its motion, your body wants to keep moving at the same speed it was before the car braked.
500
If a child is sledding down a hill with a momentum of 1500kg*m/s and hits a kid on another sled who was sitting still, what is their over all momentum after the collision?
1500kg*m/s Because of the conservation of momentum no momentum would be lost from the system and since the second child had a zero velocity he would contribute no momentum to the system.
M
e
n
u