1. Dynamics Questions Chris Parkes

2. s-t graph I drop a ball out of the window of my office (4 th floor) – which graph best represents the distance travelled with time by the ball before it hits the ground? 0 0 s t 0 0 s t 0 0 s t 0 0 s t 0 0 s t

3. v-t graph I drop a ball out of the window of my office (4 th floor) – which graph best represents the velocity of the ball with time before it hits the ground? 0 0 v t 0 0 v t 0 0 v t 0 0 v t 0 0 v t

4. Projectiles Cannons firing shells of varying masses at different angles and velocities. Which has the greatest range ? (neglecting air resistance) x y x,y,t v  2) m= 1Kg  = 45º V= 70.7 m/s (V x = 50 m/s V y = 50 m/s) 3) m= 2Kg  = 45º V= 70.7 m/s (V x = 50 m/s V y = 50 m/s) 4) m= 2Kg  = 60º V= 100 m/s (V x = 50 m/s V y = 86.6 m/s) 1) m= 1Kg  = 30º V= 57.7 m/s (V x = 50 m/s V y = 28.9 m/s)

5. speed A driver travels ¾ of his trip distance at one velocity (v) gets caught by a speed camera and completes it at half this velocity (½ v). What was the driver’s average speed for the trip? 1)0.85v 2)0.80v 3)0.75v 4)0.70v 5)0.65v

6. Dropped bullet One bullet is fired from a gun. At the same time another is simply dropped from the same height. Which hits the ground first ? 1.Dropped bullet 2.Fired bullet 3.Both at same time

7. Newton 2 In which diagram will the magnitude of the acceleration be the largest? 1kg 2kg 3kg 4kg 3kg 5kg 6kg 10kg1)2)3) 4)

8. The Levi logo has What happens if I replace one of the horses with a fence post – does this ? Horse Post 1.Cut tension on jeans by one half 2.Not change tension 3.Double tension

9. Rubber Bullet A rubber bullet and an aluminium bullet have same size,speed, mass. They are fired at a block of wood. Which is most likely to knock the block over? 1.Rubber bullet 2.Aluminium bullet 3.Both same

10. Pull a pendulum to one side let it go. As it swings back and forwards….. 1.Both angular and linear momentum are conserved 2.Only angular momentum 3.Only linear momentum 4.neither

11. 1.0.5 s 2.1s 3.2s 4.3s Pull a pendulum one degree to one side let it go. It takes 1s to swing to vertical. Now pull it two degrees to the side…how long does the swing take? 

12. Gravity The gravitational force on a copy of University Physics at the top of Ben Nevis is 40N. What would the approximate gravitational force be on the same book on a mountain twice as high ? 1) 5N 2) 10 N 3) 20 N 4) 40 N 5) 80N

13. Roller Coaster -1 A car moves along the track as shown. At a the car is moving with 10 m/s. Neglecting friction, how fast will the car be moving at B ? 60m 10m 10m/s A B 60m 1)0m/s 2) 10m/s3) 20m/s 4) 30m/s5) 40m/s6) won’t make it

14. Roller Coaster -2 A car moves along the track as shown. At a the car is moving with 10 m/s. Neglecting friction, how fast will the car be moving at B ? 60m 10m 10m/s A B 20m 1)0m/s 2) 10m/s3) 20m/s 4) 30m/s5) 40m/s6) won’t make it

15. Roller Coaster -3 A car moves along the track as shown. At a the car is moving with 10 m/s. Neglecting friction, how fast will the car be moving at B ? 60m 10m 10m/s A B 65m 1)0m/s 2) 10m/s3) 20m/s 4) 30m/s5) 40m/s6) won’t make it

16. Blocks-1 Three blocks are pushed by equal forces F over a frictionless surface for 2m. Mass of block A > mass B > mass C Which will have the largest kinetic energy? 1) block A 2) block B 3) block C 4) all have same K.E. 5) depends on precise masses F 2m

17. Blocks-2 Three blocks are pushed by equal forces F over a frictionless surface for 2m. Mass of block A > mass B > mass C Which will be travelling fastest? 1) block A 2) block B 3) block C 4) all have same speed 5) depends on precise masses F 2m

18. Blocks 3 Three blocks are pushed by equal forces F over a frictionless surface for 2m. Mass of block A > mass B > mass C Which will have received the greatest impulse during the 2m push? 1) block A 2) block B 3) block C 4) all will have same impulse 5) depends on precise masses F 2m

19. Spring A lab cart mass m velocity v crashes into a spring and compresses the spring with spring constant k. What is the maximum compression of the spring ?