Physics Review

1) Write Newton’s 1st Law. Give an example. An object in motion stays in motion… An object at rest remains at rest…. Unless acted upon by an unbalanced force! For example, when you slam on the breaks of a car, stuff flings forward off the seat (because it was in motion and remains so…)

2) Write Newton’s 2nd Law. Give an example. F = ma It is easier to push a VW beetle than a Chevrolet Suburban… A bullet hurts more that is shot than thrown at you!

3) Write Newton’s 3rd Law. Give an example. examples include: a rocket shoots “stuff” down and goes up Recoil: a bullet moves forward as the gun pushes back into your shoulder For every action there is an equal and opposite reaction

4) Explain how force, mass, and acceleration are related. Not just the formula. If force is held the same… when mass is increased, acceleration will decreased. If mass is the same, it takes greater force to obtain greater acceleration If acceleration held the same, a larger mass requires a larger force F = ma

5) Draw a graph for the following scenarios: A) A person running fast B) A person walking C) A person that is standing still D) A person running that stops for a water break. running walking standing still

6) Draw and label a picture of a balanced force. 20N

7) Draw and label a picture of an unbalanced force. 20N 16N 20N or even….

8) Create and solve your own speed problem. Josh drives his car at a speed of 45 miles per hour….what distance does he cover in three hours? Ans: 135 miles Claire drives her car 390 miles at a rate of 65 miles per hour. How long was she driving? Ans: 6 hours

9) What is acceleration? What causes an object to accelerate? acceleration is a change in velocity. It includes: speeding up slowing down changing direction acceleration is caused by unbalanced forces

10) Create and solve your own force problem. (Using F= M x A) Jazmin pushes a box with a force of 48N. If the mass of the box is 12Kg, what is the acceleration? Ans: 4 m/s/s Justin pushes another box with a force of 72N. If the box accelerates at a rate of 9 m/s/s, what is the box’s mass? Ans: 8KG

11) What is velocity? Speed with direction for example: 68 miles per hour north or 28 m/s

12) What is potential energy? Stored energy. Energy that has the ability to “do work.” examples include a rollercoaster at the top of a hill…. a battery (chemical potential energy) the stress built up in a fault between two of Earth’s plates.

13) What is kinetic energy? Energy of motion….. Examples include: an apple falling, a rollercoaster at the bottom of the first big hill, a baseball flying through the air.

Physics Review 1) Write Newton’s 1st Law. Give an example. 2) Write Newton’s 2nd Law. Give an example. 3) Write Newton’s 3rd Law. Give an example. 4) Explain how force, mass, and acceleration are related. Not just the formula. 5) Draw a graph for the following scenarios: 5A) A person running fast 5B) A person walking 5C) A person that is standing still 5D) A person running that stops for a water break. 6) Draw and label a picture of a balanced force. 7) Draw and label a picture of an unbalanced force. 8) Create and solve your own speed problem. 9) What is acceleration? What causes an object to accelerate? 10) Create and solve your own force problem. (Using F= M x A) 11) What is velocity? 12) What is potential energy? 13) What is kinetic energy?