1 / 29

Physics DCA Test Review

Physics DCA Test Review. What causes an object to accelerate? . An unbalanced force. Match the words below with the words in the box. Balanced: __3__ and __2__ Unbalanced: _1___ and __4__. What does the x axis represent? Time. What does the y axis represent? Distance.

waite
Download Presentation

Physics DCA Test Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Physics DCA Test Review

  2. What causes an object to accelerate? • An unbalanced force

  3. Match the words below with the words in the box • Balanced: __3__ and __2__ • Unbalanced: _1___ and __4__

  4. What does the x axis represent? • Time

  5. What does the y axis represent? • Distance

  6. What does the line represent? • Speed

  7. At what letter on the graph is this person traveling at a constant speed? • A, C, D, E – straight, slanted line

  8. At what point is the person traveling back to start? • C – line is negative

  9. At what point is this person going the fastest, and how do you know? • D – Steepest line

  10. Circle the areas on the graph that are balanced forces? • Every letter can be circled – constant speeds and at rest are balanced forces

  11. Put a star on the graph where the person is being effect by unbalanced forces • See above – unbalanced force – change in speed or direction

  12. What is the difference between balanced and unbalanced forces? Balanced – at rest, net force zero, constant speed Unbalanced – net force more than zero, accelerating

  13. Draw a balanced force (using arrows and net forces) on the object below.

  14. Draw an unbalanced force (using arrows and net forces) on the object below.

  15. 600 N Down 150 N Right 205 N Right

  16. Fill in the blank • Velocity includes speed and __direction___. Speed only includes ____Distance____ and ______Time____.

  17. What is the equation for speed? Speed = distance ÷ time

  18. Fill in the blank • If you know a car traveled 300 km in 2 hours you can find ___150 km/hour_____.

  19. Formulas • A train traveling 100 km in 4 hours is traveling at what average speed? • 25 km/hour

  20. What is causes the force in the picture below? the string exerts a force on the ball and causes it to move in a circle

  21. If a car with a mass of 25kg and a bus with a mass of 100kg slow to a stop at the same time, which vehicle’s brake will need more force to stop the object? • The bus will need to apply more force to its brakes, because it has more mass

  22. How is a balloon a good example of Newton’s 3rd law (action/reaction)? • Action – air exiting balloon to one side; Reaction – balloon moving the other direction

  23. If a cart with a mass of 50g and a cart with a mass of 70g were give the same push (force), which cart would accelerate faster and why? • The cart with less mass (50kg) will accelerate faster because it has less mass

  24. Which spring scale will read the largest force and why?

  25. If the truck is going forward in the direction of the arrow, and suddenly stops. What will happen in the ball inside the truck?

  26. Why does it take a greater force to move a greater mass? Because the more mass an object has, the greater the force needed to move it. F=ma

  27. Newton’s 1st Law An object in motion will stay in motion, an object at rest will stay at rest, unless an outside force is exerted on it

  28. Newton’s 2nd Law • The acceleration of an object depends on the force and mass • More force = more acceleration • More mass = less acceleration

  29. Newton’s 3rd Law For every action there is an equal and opposite reaction

More Related