Final Review. If a car has 3,000kg-m/s of momentum, and a mass of 1,000kg. How fast is it moving? A ball that has momentum must also have energy.

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1 Physics Name: Date: Period: Final Review Write the appropriate formulas with all units below. Impulse Momentum Conservation of Momentum Rank these in order from least to most momentum:.01kg mass moving at 200 m/s 1 kg mass moving at 35 m/s 100 kg mass moving at 3 m/s 2,000 kg mass moving at 0.1 m/s If a car has 3,000kg-m/s of momentum, and a mass of 1,000kg. How fast is it moving? A ball that has momentum must also have energy. An automobile airbag works by decreasing the impact force as a result of the time of impact. (HINT: Think about if impulse stays constant, and force decreases, what has to happen to the time to keep impulse constant?) A force of 500N is exerted on a baseball by the bat for 0.001s. What is the change of momentum in the baseball? A 1,000kg truck moving at 10m/s runs into a concrete wall. It takes 4.5s for the truck to stop. What is the magnitude of the force exerted on the truck during the collision?

2 A hammer strikes a nail with a 40N force for 0.04 seconds. Calculate the impulse of the hammer. Two astronauts are floating in space. One is moving at 4 m/s and the second is at rest. After they collide, they are both moving at 2 m/s. Momentum is but Kinetic Energy is. In a closed, isolated system as the mass decreases, the velocity must. A child is stationary on a frozen pond with nothing by a 5kg ball. The student wants to go home (and no, walking isn t a good idea). What can the student do (with the ball!) in order to return home? A 2kg arrow is fired at 15m/s into a stationary 20kg block of ice. The arrow sticks into the block of ice. What is the velocity of the combination after the collision? An 8.0kg bowling ball traveling at 3m/s collides with a stationary 0.5kg beach ball in an elastic collision. The bowling ball leaves the collision with a velocity of 1.5m/s traveling in the same direction as the beach ball. What is the speed of the beach ball? A careless student has done a lab to study different types of collisions using dynamics carts. The student poorly labeled the data and can t determine if the collision was elastic or inelastic. Car Car #1 Mass #1 Velocity 4 kg 12 m/s Right Car Mass #2 Car #2 Velocity Collision Car Mass #1 Car #1 Velocity 8 kg 0 m/s Collision 4 kg 4 m/s Left Car Car #2 Mass #2 Velocity 8 kg 8 m/s Right Based on the data above, this collision is (circle one) Elastic or Inelastic

3 A 25kg car moving to the right at 5.5m/s collides with a 40kg car moving to the right at 2m/s. After the collision, the 25kg car slows to 1.4m/s to the right. What is the new velocity of the 40 kg car? A 60 kg student on ice skates stands at rest on a frictionless frozen pond holding a 15 kg brick. He throws the brick at 20m/s. What is the resulting velocity of the student? A truck with a mass of 550kg travels west at 10m/s. It collides head-on with a car (350kg) traveling at 15m/s east. After the collision, the truck keeps moving towards the west at 2.0m/s. What is the final speed of the car? A car travels at a constant 50km/h down a straight line highway. What is the car s displacement after 45s? As a ball rolls down the hallway, what is the most likely force causing the ball to slow?. Earth is slightly farther from the sun in June than in December. The force of gravity of the Sun on Earth in June compared to December is smaller due to. At the top of a projectile s path above Earth, the acceleration of an object is: Zero Going negative to positive Going positive to Negative Remains unchanged Equal to 9.8 m/s 2 Equal to F=ma

4 Design an experiment to make an accurate and precise determination of the acceleration of gravity. On the following position vs. time graphs, what do the lines tell you about the velocities? (A.) (B.) (C.) What are Newton s 3 Laws of Motion? What are the lengths of the blocks? Answer: Answer:

5 Write the appropriate formulas with all units below. Kinetic Energy Gravitational Potential Energy Elastic Potential Energy A spring with a spring constant of 455 is compressed 1.4cm. What is the PE E in the spring? A 450 kg bear is climbing up a 150ft tree. What is it s PE G? A 1500kg car is doing 3,500J of work. How fast is it going? A car travels 450m in 2.3s. How fast was the car going? A car goes zero to 60m/s in 4.8s. What is it s rate of acceleration?