Name______STUDY GUIDE WORKSHEET-- MOTION AND FORCES
Speed is distance divided by time. S=D/T
- A soccer ball rolls 30 meters in 5 seconds. Find the speed. ______divided by ______=______
- It takes a car 3 hours to drive 60 km. Find the speed. ______divided by ______=______
Potential energy is stored energy or energy of position. Kinetic energy is the energy of motion.
- In above diagram, which two points is KINETIC ENERGY highest (moving energy)?____ and ____
- Which two points is POTENTIAL ENERGY lowest (stored energy)? _____ and _____
FIND THE NET FORCES OF THE FOLLOWING: (Amount of net force AND direction they will move)
Remember if they are working together, you ADD their forces; if working in opposite directions, SUBTRACT the amounts
5. 6. 7.
4 N right4 N left=____,_____ 2 N left 6 N right=_____,_____ 5 N right 10 N right____,____
8. In above graph, between what points is there constant speed (stays the same)?_____and ______
9. In the graph, describe the motion between points A and B in the graph?______
Newton’s 1st law of motion (seatbelt law or law of inertia)-An object at rest will remain at rest or an object instraight-line mostion will remain at that motion unless an unbalanced force acts on it.
Newton’s 2nd law of motion (linebacker law)- Force = mass x acceleration
Newton’s 3rd law of motion (rocket law)- For every action there is an equal and opposite REACTION
IDENTIFY WHICH OF THE ABOVE 3 NEWTON’s LAWS IS EACH OF THE FOLLOWING AN EXAMPLE:
10._____A golf ball will sit at rest on a tee until it is hit by a golf club.
11._____The diver pushes down on the diving board with his feet. The diving board then pushes him upward.
12.Sam is pushing a box across the floor. How could he make it move faster? (Circle INCREASE or DECREASE for each below
INCREASE or DECREASE the mass of the boxINCREASE OR DECREASE the force he is pushing with
13. Stan weighs 135 kg. Tom weighs 115 kg. They are linebackers that have the same acceleration and speed. According to 2nd law, who should have the most force when they tackle (hit)?______
14. A person not wearing a seatbelt continues to move forward when a car suddenly stops. What is it called when the person’s body resists stopping or starting motion?______
15. What happens to an object’s speed or motion when you have MORE friction?______
16. What force causes a car to roll farther on wood than carpeted floor?______
17. Name 7 simple machines ______
KNOW WHAT EACH MACHINE LOOKS LIKE
18.There are 3 surfaces on which a brick is slid—icy, dry, and wet. Rank them in order of how far the brick will slide from LOWEST TO GREATEST distance. ______
19. Explain how the amount of friction of the different surfaces affects the motion of the brick.______