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Review OF 1st Quarter Final
1a. On the earth, what is the ratio of an object’s weight to its mass? (Hint: The “ratio of x to y” = x/y.) b. A rock is dropped over the
edge of a cliff. What is the rock’s acceleration?
2. Kyle is mad at Tu and pushes him to the right with a force of 500N. Tu’s body pushes back on Kyle with an equal force. a. Draw a
picture of the forces (called a “free body diagram”) for Tu. b. Draw a free body diagram for Kyle. c. Which direction does each
accelerate?
3. A rope pulls a 30.0N bucket of water up at a constant acceleration of 1.50m/s². What is the tension in the rope?
4. The distance vs. time graph for an object moving in a straight line is drawn to the right. What is the
acceleration of the object?
5a. If an object has only 1 force acting on it, can its acceleration be 0m/s2? b. An object starts at rest and is pulled
by a constant force. Draw a sketch of the velocity vs. time graph for the object.
6. A skydiver jumps from an airplane that is flying horizontally. Assuming down is the positive direction, draw a sketch of the velocity vs.
time graph for the skydiver’s vertical velocity as he falls, including the effects of air resistance.
7. If a feather is dropped on the moon, what will be the motion of the feather? (Think about the tree diagram you filled in.) b. Draw a
sketch of the velocity vs. time graph of a feather being dropped on the moon.
8. A table holds a 50N box. a. With what force does the table push on the box? b. If a girl pushes down on the box with a force of
25N, what is the normal force on the box now? (Don’t forget to include the direction of the normal force.)
9. A girl kicks a soccer ball to her friend who is directly north of her by kicking the ball at an angle of 30° above the horizontal
(which is north). a. What direction is the ball’s initial vertical velocity? b. What direction is the ball’s initial (and constant)
horizontal velocity? c. At the top (apex) of the ball’s flight, what direction is its total velocity?
10. A rock is thrown at an angle of 20.0° above horizontal from the top of a cliff with an initial speed of 5.00 m/s. If the rock takes
2.50s to land on the ground below the cliff, a. what is the height of the cliff?
11. A girl pushes an 5.00 kg box across the floor. When she lets go of it the box slows down because of friction at 3.6m/s 2. What is
the coefficient of friction between the box and the floor?
12. A 5kg box moves at 3m/s and a 3kg box moves at 5m/s. a. Which has more inertia? b. If they are travelling toward each other and
run into each other, which mass will experience the greater force? c. Which mass will experience the greater acceleration?
Review OF 1st Quarter Final
1a. On the earth, what is the ratio of an object’s weight to its mass? (Hint: The “ratio of x to y” = x/y.) b. A rock is dropped over the
edge of a cliff. What is the rock’s acceleration?
2. Kyle is mad at Tu and pushes him to the right with a force of 500N. Tu’s body pushes back on Kyle with an equal force. a. Draw a
picture of the forces (called a “free body diagram”) for Tu. b. Draw a free body diagram for Kyle. c. Which direction does each
accelerate?
3. A rope pulls a 30.0N bucket of water up at a constant acceleration of 1.50m/s². What is the tension in the rope?
4. The distance vs. time graph for an object moving in a straight line is drawn to the right. What is the
acceleration of the object?
5a. If an object has only 1 force acting on it, can its acceleration be 0m/s 2? b. An object starts at rest and is pulled
by a constant force. Draw a sketch of the velocity vs. time graph for the object.
6. A skydiver jumps from an airplane that is flying horizontally. Assuming down is the positive direction, draw a sketch of the velocity vs.
time graph for the skydiver’s vertical velocity as he falls, including the effects of air resistance.
7. If a feather is dropped on the moon, what will be the motion of the feather? (Think about the tree diagram you filled in.) b. Draw a
sketch of the velocity vs. time graph of a feather being dropped on the moon.
8. A table holds a 50N box. a. With what force does the table push on the box? b. If a girl pushes down on the box with a force of
25N, what is the normal force on the box now? (Don’t forget to include the direction of the normal force.)
9. A girl kicks a soccer ball to her friend who is directly north of her by kicking the ball at an angle of 30° above the horizontal
(which is north). a. What direction is the ball’s initial vertical velocity? b. What direction is the ball’s initial (and constant)
horizontal velocity? c. At the top (apex) of the ball’s flight, what direction is its total velocity?
10. A rock is thrown at an angle of 20.0° above horizontal from the top of a cliff with an initial speed of 5.00 m/s. If the rock takes
2.50s to land on the ground below the cliff, a. what is the height of the cliff?
11. A girl pushes an 5.00 kg box across the floor. When she lets go of it the box slows down because of friction at 3.6m/s 2. What is
the coefficient of friction between the box and the floor?
12. A 5kg box moves at 3m/s and a 3kg box moves at 5m/s. a. Which has more inertia? b. If they are travelling toward each other and
run into each other, which mass will experience the greater force? c. Which mass will experience the greater acceleration?