Lots of Laws
You're riding in the backseat of a car and the person slams on the brakes. You lurch forward and hit your head on the seat in front of you. What law explains why you hit your head?
Newton's 1st Law (Law of Inertia)
A 5 kg ball is rolling towards a wall with an acceleration of 4 m/s2. With what force will the ball hit the wall?
20 N
A 100 person running 1.5 m/s hits a wall. What was their momentum before the crash?
150 kg*m/s
O m/s2
What is the formula for finding Force?
F=ma
They will hit the ground at the same time.
A 400 kg car hits another car with 8,000 N of force. What was the car's acceleration?
20 m/s2
A car moving at 10 m/s has 3000 N of force. How much mass does that car have?
300 kg
DAILY DOUBLE!!!
Draw a free body diagram of a 5 kg box being pushed with 5 N of force but not accelerating.
Forces:
49N Down
5 N -> <- 5N
49N Up
p=mv
A motorcycle accelerates faster than a minivan. Which law explains why this happens?
Newton's 2nd Law
DAILY DOUBLE!!!
A plane moving at 16 m/s2 hits a floating balloon with 10,000 N of force. What is the mass of the plane?
625 kg
A 400 kg car has 8000 kg*m/s of momentum. What is their velocity?
20 m/s
I push a 5kg box with 6N of force and it is being resisted by 5N of friction. What is the boxes acceleration?
What is the difference between weight and mass?
Weight is the force of gravity pulling on mass.
Which law explains why when you punch a wall your hand hurts.
Newton's 3rd Law
A man has 170 kg of mass. What is his weight?
1,666 N
Two cars each with a momentum of 500 kg*m/s crash into each other. What will be their combined momentum after the crash?
1000 kg*m/s
I am pushing a 10kg object to the left. It is being resisted by 2N of friction. It is accelerating at 8 m/s2. With how much force am I pushing the object?
82 N
What has the unit kg*m/s?
Momentum
According to the Law of Conservation of Momentum, if a car with 20 kg*m/s of momentum hits a car with 60 kg*m/s, what will be their combined momentum after the collision?
80 kg*m/s
A man that weighs 2050 N is running at a wall with an acceleration of 5 m/s2. With what force will he run into the wall?
1046 N
A 10 kg cart and a 20 kg cart each traveling at 2 m/s crash into each other. Afterwards, the 10 kg cart is traveling at 3 m/s. How fast is the 20 kg cart moving?
1.5 m/s
I push a 10kg box with 40N of force to the right. It accelerates at 1.5 m/s2. What is the force of friction on the box?
25 N to the left
A 1400 N cow is running at you at 3 m/s. How much momentum will it hit you with if you stand still and take the hit?
428.6 kg*m/s