1. Which of the following should be part of solving any problem in physics? Select all that apply:
(a) Read the problem carefully.
(b) Draw a picture of the situation.
(c) Write down the variables that are given.
(d) Think about which physics principles to apply.
(e) Determine which equations can be used to apply the correct physics principles.
(f) Check the units when you have completed your calculation.
(g) Consider whether your answer is reasonable.
2. In which of the following cases does a car have a negative velocity and a positive acceleration? A car that is traveling in the
(a) - x direction at a constant 20 m/s.
(b) - x direction increasing in speed.
(c) + x direction increasing in speed.
(d) - x direction decreasing in speed.
(e) + x direction decreasing in speed.
3. At time t = 0 an object is traveling to the + x right along the axis at a speed of 10.0 m/s with acceleration -2.0 m/s2. Which statement is true?
(a) The object will slow down, eventually coming to a complete stop.
(b) The object cannot have a negative acceleration and be moving to the right.
(c) The object will continue to move to the right, slowing down but never coming to a complete stop.
(d) The object will slow down, momentarily stopping, then pick up speed moving to the left.
4. A ball is thrown straight up. What are the velocity and acceleration of the ball at the highest point in its path?
(a) v = 0, a = 0
(b) v = 0, a = 9.8 m/s2 up.
(c) v = 0, a = 9.8 m/s2 down.
(d) v = 9.8 m/s up, a = 0.
(e) v = 9.8 m/s down, a = 0