Newton's 1st Law
According to Newton's 1st law, what will happen to an object at rest if no unbalanced forces act on it?
It will stay at rest.
If you increase the mass of an object, what happens to the amount of force required to move it?
It also increases.
Newton's 3rd law says that every action has an ___________ and _____________ reaction.
equal, opposite
Which will have more momentum - a 10 kg cart traveling at 15 m/s or a 25 kg cart traveling at 15 m/s?
The 15kg cart
What is the formula for force?
F=ma
If you were to throw a ball in space, what would happen to it?
It would continue moving in the same speed and direction until an outside force acted on it.
If you increase the force you apply to an object, what will happen to its acceleration?
It will also increase.
When you walk, the action force is your foot pushing on the ground. What is the reaction force?
The ground pushing on your foot.
Which will have more momentum - a 3 kg bowling ball traveling at 5 m/s or a 3 kg bowling ball traveling at 10 m/s?
The bowling ball traveling at 10 m/s
What is the formula for momentum?
p=mv
Which has more inertia - a 15 kg child or a 45 kg adult?
The adult - more mass = more inertia.
If you push one empty shopping cart with 10 N of force and a second empty shopping cart with 20 N of force, which will accelerate faster?
The shopping cart that you pushed with 20 N of force
When a fish swims, the action force is its fins pushing on the water. What is the reaction force?
The water pushing on the fish's fins.
When a moving car collides with a car at rest, what will happen?
The moving car will transfer momentum to the stopped car.
AND/OR
The total momentum will stay the same
A bicycle with a mass of 25 kg moves with velocity of 20 m/s. What is the bicycle’s momentum?
500 kg * m/s
Why does it feel like you fly forward when you are riding in a car and the driver slams on the brakes?
Because your inertia keeps you moving forward.
You apply the same amount of force to a 1 kg ball and a 10 kg ball. Which one will accelerate more?
The 1 kg ball.
When you drop an egg on the floor, the action force is the egg pushing on the floor. What is the reaction force?
The floor pushing on the egg
According to the Law of Conservation of Momentum, what happens to the combined momentum of two objects after they have collided?
The total momentum stays the same
The mass of a truck is 2000 kg. If 10,000 N of force are applied to it, how fast will it accelerate?
5 m/s2
What is inertia?
The tendency of objects in motion to stay in motion and objects at rest to stay at rest.
If you keep force constant and increase mass, what will happen to acceleration?
It will decrease.
Gravity is pulling us all toward the center of the Earth. What is stopping us from continuing downward until we reach it?
We push on the floor/ground; the floor/ground pushes back on us.
In class, we dropped a basketball and a racquetball together. The racquetball went flying when the basketball collided with it. Why did this happen?
The basketball transferred momentum to the racquetball.
AND/OR
Because the racquetball is lighter than the basketball, that same amount of momentum led the racquetball to fly with much higher velocity than the basketball.
What is the mass of a car with velocity of 30 m/s and a momentum of 12,000 kg∙m/s?
400 kg