Which Law?
A baseball hit with a bat accelerates more than a bowling ball hit with a bat.
2nd Law.
This force opposes the force of gravity when objects fall through the air.
Air resistance.
Do balanced or unbalanced forces result in a change in motion?
Unbalanced forces.
Newton’s 1st Law is also known as the…
Law of inertia
Mass in motion is also known as…
Momentum
A balloon flies foreword when air quickly escapes it.
3rd Law.
What two factors affect gravitational pull?
Mass and distance between masses.
Mikaia pushes a box with a force of 10 N to the right and Lisa pushes with a force of 3 N to the left. Find the net force applied to the box.
7 N to the right.
The more ______you have, the more inertia you will have.
Mass
If the mass of a bulldozer is 1,250 kg and it is moving at a speed of 20 m/s, how much momentum does it have?
25,000 kg*m/s
A book left on the table overnight is there when you return in the morning.
1st Law.
What is the acceleration due to gravity on Earth?
9.8 m/s^2
What is the unit for weight.
Newtons
The law that states that an object accelerates in the same direction as the force applied to it is…
Newton’s 2nd Law
What force best explains why a feather and a tennis ball do not both fall with an acceleration of 9.8 m/s2 like they should?
Air resistance
You run into a friend while skating and you both fall in opposite directions.
3rd Law.
Ignoring air resistance and friction, what should be observed about two objects that are dropped at the same time?
Both objects should have the same acceleration.
Name 3 common forces that can be applied to objects.
Friction
Gravity
Air resistance
What would a man weigh if he has a mass of 60 kg?
588 N
Rank the following items from most momentum to least momentum.
Fast airplane
Slow bicyclist
Parked car
Fast bicyclist
Fast airplane
Fast bicyclist
Slow bicyclist
Parked car
The bike you are riding hits a hole and stops quickly, but you fly forward.
1st Law.
The maximum speed a falling human can reach is 55 m/s (or 118.06 mi/hr.) What is the name for this speed and what two forces become balanced for this to be possible?
Terminal velocity
Gravity and Air Resistance
Find the acceleration os an 80kg box with 30 N coming from the left and 50 coming from the right. Ignore friction and air resistance.
0.25 m/s^2
The force exerted on a cart is constant. On a frictionless surface, if the cart’s mass is increased, what will happen to its acceleration? Include which law supports your answer.
Decreases, because of Newton’s 2nd Law
A car accelerates from 20 m/s to 60 m/s in 5 s. If the mass of the car is 150 kg, find the force on the car and the final momentum.
F = 1,200 N
p (final) = 9,000 kg*m/s