What is Newton’s 2 nd Law?

Force = mass x acceleration (F=ma)

What is Newton’s 1 st Law?

An object will keep doing whatever it is already doing unless acted upon by an unbalanced force.

Which of Newton’s Laws helps you understand… why you have to push harder on a heavy object to get it to slow down than you do to get a light object to slow down.

Which of Newton’s Laws helps you understand… why you have to push harder on a heavy object to get it to slow down than you do to get a light object to slow down. Newton’s 2 nd Law

Which of Newton’s Laws helps you understand… why you can’t move objects with your mind (o.k., that’s a stretch)

Which of Newton’s Laws helps you understand… why you can’t move objects with your mind (o.k., that’s a stretch) Newton’s 1 st Law

What’s the equation for calculating the time it takes an object to go a particular distance at a particular speed?

Time = Distance / Speed

How long will it take to go 500 miles at 60 miles per hour?

8.3 hours

In miles per hour, how fast would you need to drive to go 240 miles in 120 minutes?

120 miles per hour

If 1 pound = 0.45 kg, how many kg is 125 pounds?

56 kg

If 1 kg = 2.2 pounds, how many kg is 90 pounds?

41 kg

Graph the following: Doug the dog was a happy little puppy. One day, he decided to take a walk to the nearby park. It took him 15 minutes to run the 3 miles to the park. He sat down and stayed 5 minutes, sniffing around. Since he was hungry, he decided to head back home. After running 2 miles for 7 minutes, he got very tired. Even though his house was only 1 mile away, he decided to take a nap. He slept for 15 minutes. When he woke up, he scurried the rest of the way home in 5 minutes.

15 minutes to run the 3 miles. Stayed 5 minutes. Back toward home running 2 miles for 7 minutes. Slept for 15 minutes. Rest of the way home in 5 minutes.

What was the dog’s average speed from the time he left for home and the time he got home?

15 minutes to run the 3 miles. Stayed 5 minutes. Back toward home running 2 miles for 7 minutes. Slept for 15 minutes. Rest of the way home in 5 minutes. What was the dog’s average speed from the time he left for home and the time he got home? 0.1 miles / minute or 9 minutes / mile

15 minutes to run the 3 miles. Stayed 5 minutes. Back toward home running 2 miles for 7 minutes. Slept for 15 minutes. Rest of the way home in 5 minutes. What was the dog’s average speed on the last leg of his journey?

15 minutes to run the 3 miles. Stayed 5 minutes. Back toward home running 2 miles for 7 minutes. Slept for 15 minutes. Rest of the way home in 5 minutes. What was the dog’s average speed on the last leg of his journey? 0.2 miles / minute or 5 minutes / mile

Alexa is pushing a little car with a mass of 18 kg. The car’s acceleration is 3 m/s 2. Find the force Alexa is applying to the car.

54 N

Superman can supply a force of 8,000,000 N. If he’s going to stop the train in time he needs to accelerate it at 60 m/s 2. What is the most the train can weigh (really its mass) and Superman be able to stop it in time?

133,333 kg

Draw a free body diagram of a parachutist that has just jumped out of a plane, has not deployed her chute yet, and has not yet reached terminal velocity.

Gravity Air Resistance

Draw a free body diagram of a parachutist that has just jumped out of a plane, has deployed her chute, and has reached terminal velocity.

Gravity Air Resistance Chute

What is the net force acting on the object below? Two people pushing Friction Velocity 25 N 20 N 15 N

What is the net force acting on the object below? Two people pushing Friction Velocity 25 N 20 N 15 N 30 N 

The object is already moving to the right when the forces begin to be applied. What will happen to the object? Two people pushing Friction 25 N 20 N 15 N

The object is already moving to the right when the forces begin to be applied. What will happen to the object? Two people pushing Friction 25 N 20 N 15 N It will continue to move to the right, speeding up.

The object is already moving to the left when the forces begin to be applied. What will happen to the object? Two people pushing Friction 25 N 20 N 15 N

The object is already moving to the left when the forces begin to be applied. What will happen to the object? Two people pushing Friction 25 N 20 N 15 N It will continue moving to the left but slow down, reach a speed of 0, change direction, and speed up.

The object is not moving when the forces begin to be applied. What will happen to the object? Two people pushing One person pushing 25 N 20 N 45 N

The object is not moving when the forces begin to be applied. What will happen to the object? Two people pushing One person pushing 25 N 20 N 45 N It will continue to not move.