1. Move your hand in the way indicated by the velocity-time plots below

2. A car is traveling along a straight road. The first curve on the left represents the car’s position as a function of time. Which of the other curves best represents the car’s i) velocity ? ii) acceleration?

3. A car on a straight road has the following velocity-time curve 1. Roughly, what is its total displacement in the 120 seconds? a) 1200mb) 2400mc) 12,000md) none of the above 2. Which value best represents its acceleration at t=70 s? a)1.5 m/s 2 b) -1.5 m/s 2 c) 0 m/s 2 d) 2.0 m/s 2 e) -2.0 m/s 2 v(t)v(t)

4. A ball is thrown upwards. If is its total displacement from the point of release, when is the equation valid? (“Up” is the positive x-direction) (a) Only when the ball is either going up or going down, but not both. (b) Over the entire trajectory. (c) Over the entire trajectory except at the top. (d) None of the above.

5. Can we use the kinematic equations to solve for v if we know the shape of the slide? A block of wood slides down a frictionless surface as shown below, starting from rest. a) Yes, because the surface is frictionless, so the accelerations is 9.80 m/s 2 downwards b) No, because the acceleration is not constant c) Yes, because the acceleration is constant although not 9.80 m/s 2 d) None of the above

6. The following v(t) graph corresponds to constant acceleration. v(t) 0 v o Δt ymxb  Recall: slopeintercept Which of the equations below is (are) correct?

7. An object is thrown upwards with an initial velocity of 10 m/s. Which of the following single equations can be used to calculate the time to return to the thrower’s hand? All are “correct” kinematic equations a = 9.80 m/s 2

8. Which of the following expressions is the most correct? (why/why not)

9. A ball is thrown vertically upwards. The dots below give the positions of it at 0.4s intervals (“up” is the positive direction) 1.What is the ball’s displacement from the start after 3.2 s? a) –7.1 m b) +12.5 m c) +26.7 m 2. What is the ball’s average velocity between 0.4 s and 3.6 s? a) b)c) 0 m/s b) 0 m/s 3. What is the ball’s average velocity between 3.2 s and 3.6 s? a) c)d) none of the above 19.6 m 18.9 m 16.7 m 12.7 m 7.1 m 0 m

10. In the figure above, the circles show the positions of a thrown ball at equal time intervals. represents the initial velocity, just as it leaves the thrower's hand. (1) Which of the above vectors best represents the instantaneous velocity of the ball at point A? (2) Which of the above vectors best represents the average velocity of the ball between points A and B?

11. How do I draw a pictorial/physical representation? How do I know what equation to use? Jane is driving at 30 m/s when she sees a rabbit on the road ahead. She brakes to a stop in 10 s with a constant deceleration. How far does she go before she stops? Pictorial: Physical: Mathematical: Know: v 0 = 30 m/s, v = 0 m/s, Δt = 10 s, Want Δx = ? Formula sheet v = v 0 + a Δt v 2 = v 0 2 + 2a Δx ΔtΔt v0v0 v