Uniform Acceleration Review

The rate at which ______ changes with time is called acceleration. Distance Displacement Position Velocity 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

0 m/s2 About -5 m/s2 About -10 m/s2 About 20 m/s2 When something falls to the ground it accelerates. This acceleration is called the acceleration due to gravity and is equal to _____ on the earth’s surface. 0 m/s2 About -5 m/s2 About -10 m/s2 About 20 m/s2 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

More than the speed it had when thrown upwards. A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be ___. More than the speed it had when thrown upwards. Less than the speed it had when thrown upwards. The same as the speed it had when thrown upwards. 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Suppose an object is in free fall. Each second, the object falls ____. With the same average speed. With the same instantaneous speed. The same distance as in the second before. A larger distance than in the second before. 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

0 m/s About 5 m/s About 10 m/s About 20 m/s A ball is thrown straight up. At the top of its path its instantaneous speed is ____. 0 m/s About 5 m/s About 10 m/s About 20 m/s 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

If an object were equipped with a speedometer and allowed to fall freely, the reading on the speedometer would increase each second by ___. 5 m/s 10 m/s 20 m/s 30 m/s 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Ten seconds after starting from rest, a freely falling object will have a speed of about ____. 10 m/s 50 m/s 100 m/s 500 m/s 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

In the direction of the motion Opposite its velocity Directed upward A ball tossed vertically upwards rises, reaches it highest point, and then falls back to its starting point. During this time, the acceleration of the ball is always ____. In the direction of the motion Opposite its velocity Directed upward Directed downward. 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

60 km/hr 120 km/hr 480 km/hr 960 km/hr Suppose you take a trip that covers 240 km and takes 4 hours to make. Your average speed is ___. 60 km/hr 120 km/hr 480 km/hr 960 km/hr 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Suppose a jumper claims a hang time of 2 seconds Suppose a jumper claims a hang time of 2 seconds. Then that jumper must be able to jump a vertical distance of ____. 2 m 5 m 10 m 20 m 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

An object is considered to be in free fall if The object is moving downward Air resistance is slowing the object. The only force acting on it is gravity. It is accelerating. 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Which of the following cannot be negative? Acceleration Displacement Time Velocity 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

If you toss a ball up, its acceleration at its maximum height is zero. True False 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

When a child drops a ball, the ___ of the ball as the child lets go is zero. Acceleration Average velocity Instantaneous velocity All of the above. 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

A skydiver in free fall reaches a speed of 60 m/s when she opens her parachute. The parachute slows her down to 7.00 m/s at a rate of 30 m/s2. How far does she fall during this time? -20 m 20 m -60 m 60 m 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

A car rolls down a 52. 0 m inclined parking lot and is stopped by a fence. If it took 11.25 s to roll down the hill, what was the acceleration before striking the fence? 10 0.823 m/s2 -0.823 m/s2 9.24 m/s2 -9.24 m/s2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

A rock is thrown upward with a speed of 26 m/s A rock is thrown upward with a speed of 26 m/s. How long after it is thrown will the rock have a velocity of 48 m/s toward the ground? 10 2.2 s 7.6 s 12.2 s 22 s 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

A hiker drops a water bottle to a friend down in a canyon A hiker drops a water bottle to a friend down in a canyon. The friend caught it 4.78 s later. How deep is the canyon? 10 56 m 112 m 224 m 448 m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

The high dive board at most pools is 3. 00 m above the water The high dive board at most pools is 3.00 m above the water. A diver dives off the board and hits the water 1.18 s later. What was his initial velocity? 10 2.62 m/s 3.23 m/s 8.30 m/s 8.62 m/s 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

How high above the board did the diver in the previous problem rise? 10 0.165 m 0.330 m 0.532 m 0.659 m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26