Force+Test+Answers



__Force Test Answers 1__ Know all objects have mass. 0a. Compare and contrast force and velocity. 0b. How are net forces calculated? 0c. What do unbalanced forces on a object cause?

1a. A force can be described by its magnitude and direction. 1b. A velocity can be described by its speed and direction. 1c. A force can change the velocity of a mass.

2a. The unit for force is a Newton. 2b. A force of 3N to the left can be represented by:

3. To find the __net force__ on a object, calculate the sum of all forces acting on the object.

4. If a 2N force is pushing on an object to the left and a 7N force is pushing on it to the right, the net force is ……..

5. When forces are balanced, an object’s speed and direction are constant. (stays the same)

6. Forces of the same magnitude in opposite directions are balanced. (150 N left and 150 N right)

7. For stationary objects, When forces are balanced the net force is zero, so the object doesn’t move. (In contrast, acceleration occurs when something starts moving. A change in velocity occurs.)

8. Different size vectors can be used to show unbalanced forces. --- --- --- --- à ß --- ---

9. Elastic force can be produced by springs and bungee cords.

10. Weight is a measure of the gravitational force on an object.

11. A forward force is exerted on a shopping cart on level ground. The force acting against the forward force on the shopping cart is …… ……

12. What force keeps stationary objects from moving? …….. ...... keeps stationary objects from moving.

13. As a plane flies through the air, what force acts backwards against the plane? (Inertia, sliding friction, fluid friction, or centripetal force) …… …….. acts backwards on a plane’s motion.

14. What force act on all objects in the universe?

15. What must be measured to find the force of gravity between two objects? (Two things) What determines the force of gravity between two objects?

16. Rate of __acceleration__ depends on the __net force__ and __mass__ of the object.

Force = Mass X Acceleration

Acceleration = __Force__ Mass

17. To maintain the same acceleration, ……. force is required to move a wagon if mass is added to it. Accelerating a bigger mass requires a more force.

18. What does the slope of the graph represent? __Rise__ = Slope Run and 2nd law of motion is __Force__ = Acceleration Mass so the slope represents ………….. 19. Using the graph, how much force is required to move a 30 kg object? Note: Force = mass x acceleration so 1m/s2 x 30kg =

20. With a buff mass of 100kg, Cosme stands on a planet where gravity accelerates objects at 2m/s2, what force would he exert on the ground? mass x acceleration = force, so ……..kg x ……..m/s2 = ……..N

Force Test Answers 20. With a mass of 100kg, Cosme lives on a planet where gravity accelerates objects at 20m/s2, what force would he exert on the ground? mass x acceleration = force, so ……..kg x ……..m/s2 = ……..N This acceleration is twice the acceleration found on Earth, so now we know why Cosme is so buff.

Essay Describe the changed in the gravitational pull between the two bodies a the planet orbits the star. Explain why these changes occur. Which of the two bodies has a greater gravitational pull and why?