Matching #14-20 Match Each Term in Column 2 with a Description in Column 1

Review – semester 1

Matching – match each term in column 2 with a description in column 1.

_____ . Amount of matter in an object a. SI

_____ SI unit of time b. kilogram

_____ Prefix meaning 1000 c. mass

_____ Basic SI unit of length d. kilo

_____ Basic SI unit of mass e. second

_____ System of measurement used worldwide f. volume

_____ . The amount of space occupied by an object g. meter

True or False

1.  An object can have a constant speed and a changing velocity.

2.  An object can have a constant velocity and a changing speed.

3.  An object can have a constant speed and be accelerating.

4.  As a ball falls freely the distance it falls each second is the same.

5.  If an object slows down in the positive direction it has a negative acceleration.

6.  Speed and Velocity are vector quantities while distance and displacement are scalar quantities.

7.  The graph of an object that is undergoing constant acceleration is a parabolic curve

8.  The graph of an object that is undergoing constant velocity is a parabolic curve.

9.  An object can have zero velocity and still be accelerating.

10.  An object can have a negative velocity and a positive acceleration.

Multiple Choice

11.  Acceleration is defined as the

a.  change of position divided by the time needed to make that change

b.  change in velocity divided by the time needed to make that change

c.  time it takes to move from one speed to another speed

d.  time it takes to move from one place to another place

12.  Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is not true?

a.  You and the car are accelerating

b.  Your speed is constant

c.  Your velocity is constant

13.  Suppose you go on a trip that covers 240 km in 4 hours. Your average speed would be.

a. 480 km/hr b. 240 km/hr c. 120 km/hr d. 60 km/hr

14.  A car is driven 30 mi east and then 40 mi north. The total distance the car has traveled is

a. 70 mi b. 50 mi c. 50 mi northeast

15.  Which of the following is not true about the car in # 14

a.  The magnitude of the displacement is 70 mi

b.  The displacements direction is to the northeast

c.  The magnitude of the displacement is something less that 70 mi

16.  Suppose a car is moving in a straight line and its speed is increasing at a constant rate. If the car moves from 35 km/hr to 40 km/hr in one second and from 40 km/hr to 45 km/hr in the next second, what is the cars acceleration?

17.  Explain why a projectile launched horizontally will hit the ground in the same amount of time as an object that is dropped from the same height.

18.  Are there any horizontal forces acting on a projectile after it is in the air? If so, what force?

19.  Are there any vertical forces acting on a projectile after it is in the air? If so, what force?

20.  What are the horizontal and vertical components of a 40N force acting at a 30 degree angle above horizontal?

21.  True or False – a change in direction or a change of an objects speed is called inertia.

22.  True or False – velocity is a vector quantity.

23.  What is the shape of the curved path that a projectile takes when in flight?

a. hyperbola b. straight line c. parabola d. principal axis

25. What is Newton’s 1st law?

26. What is Newton’s 2nd law?

27. What is Newton’s 3rd law?

28. Which has more mass, a kilogram of feathers or a kilogram of iron

a.  the feathers

b.  the iron

c.  neither, the masses are equal

29. How much inertia would a 2kg mass have compared to 1kg of iron?

a.  four times as much

b.  twice as much

c.  the same amount

30. A 10 N force and a 30 N force act in the same direction on an object. What is the net force on the object?

a. 40 N b. 30 N c. 20 N d. 10 N

31. A 10 N force and a 30 N force act in opposite directions on an object. What is the net force on the object?

a. 40 N b. 30 N c. 20 N d. 10 N

32. If the force acting on a cart is doubled, but the mass of the cart remains the same, what happens to the cart’s acceleration?

a. it doubles b. it stays the same c. it is cut in half d. it is quartered

e.  Forces always occur

a. when velocities are constant b. as single quantities c. in pairs

True or False

33._____The amount of matter in an object is called the weight of the object.

34.  _____The letter “g” is the symbol for the acceleration due to gravity.

35.  _____The Metric unit of force is the kilogram.

36.  _____If a hockey puck slides on a perfectly frictionless surface, it will eventually slow down because of its inertia.

37.  _____Inertia is the resistance any material object has to a change in its state of motion.

38.  _____The Law of Inertia applies to objects that are not moving, but not to objects that are moving.

39.  _____The farther two objects are away from each other, the less gravitational force they will exert on each other.

40.  _____An object with a mass of 2 kg will have the same amount of inertia as one with a mass of 3 kg.

42. _____Mass is the amount of space an object occupies.

43. Kinetic Energy is the energy of ______

44. Potential Energy is energy that is ______because of its position

45. Work requires that a force is exerted on an object and consequently the object ______

46. The law of conservation of energy states that the total energy in a system ______

47. A roller coaster car starts from rest on the top of the first hill. At the top the car has ______energy, but as it accelerates down the hill it gains______energy and loses______energy. When it gets the the lowest point of the ride it has only ______energy.

48. If the track was frictionless, how much energy would the car have at the bottom of the hill as compared to how much it had at the top of the hill?

Same More than at top Less than at top

Problems

1.  Motion - A car starts from rest and speeds up in the positive direction for 6.0 s with a uniform acceleration of 1.5 m/s/s. The driver then applies the brakes and slows down for 2.5 seconds in the positive direction with an acceleration of - 2.0 m/s/s.

a.  How fast is the car going at the end of the braking period?

b.  How far has the car gone from its start?

c.  What was the average velocity of the car for the whole trip?

2.  Projectile motion - A box of supplies is dropped from an airplane which is located a vertical distance of 340 m above a lake. If the plane has a horizontal velocity of 70 m/s, what horizontal distance will the box travel before striking the water?

velocity vs. time

3.  An objects motion is graphed above. What is the acceleration of the object at t=1.0 s?___

4.  What is the acceleration of the object at t=4.0 s?______

5.  What is the displacement of the object between 3.0s and 4.0 s?______

6.  What is the displacement of the object for the entire trip?______

7.  In what time interval was the acceleration the most?______

8.  In what time interval was there zero acceleration?______

Force

9.  The space shuttle has a mass of 2.0X106 kg. At lift-off the engines generate an upward force of 3.0X107 N.

a.  What is the weight of the shuttle?

b.  What is the acceleration of the shuttle when launched?

10.  A clerk moves a box of cans down an aisle by pulling on a rope attached to the box. The clerk pulls with a horizontal force of 285 N. The box has a mass of 35 kg, and the coefficient of friction between the box and floor is 0.450. Find the acceleration of the box.

Energy

11. A bowling ball suspended from the ceiling swings down a vertical height of 1.2 m If the bowling ball was let go from rest, what is the speed at the bottom of the swing?

12. An sled is pulled a distance of 185m. The task requires 1.20X104J of work and is done by pulling on a rope with a force of 125N. At what angle is the rope held.