Kinematics
Free Fall
Forces and Friction
Vectors
Projectile Motion
100
In a velocity vs time graph, the slope of the graph is the
Acceleration
100
What is the acceleration of falling objects?
9.8
100
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is _____________.
same
100
A racecar makes one lap around a circular track of radius 50 m. When the car has traveled halfway around the track, what is the car's displacement ?
50 m
100
A football is kicked at an angle with respect to the horizontal. Which one of the following statements best describes the acceleration of the football during this event if air resistance is neglected? A) The acceleration is 0 m/s2 at all times. B) The acceleration is 9.8 m/s2 at all times. C) The acceleration is zero when the football has reached the highest point in its trajectory. D) The acceleration is positive as the football rises, and its is negative as the football falls. E) The acceleration starts at 9.8 m/s2 and drops to some constant lower value as the ball approaches the ground.
B) The acceleration is 9.8 m/s2 at all times.
200
A car accelerates from rest to a speed of 35 miles an hour in only 6 seconds. What is the acceleration?
2.6 m/s^2
200
A ball is thrown straight up at 10 m/s. At the top of its path its speed is ________________
0
200
A 3 kg box is pushed on a horizontal surface. It moves on the surface with an acceleration of 0.27 m/s2. Calculate the applied force that must be acting on the box.
0.81 N
200
Which one of the following quantities is a vector quantity? A) the age of the earth B) the mass of a football C) the earth's pull on your body D) the temperature of an iron bar E) the number of people attending a baseball game
C
200
A projectile is fired at an angle of 60.0° above the horizontal with an initial speed of 30.0 m/s. How long does it take the projectile to reach the highest point in its trajectory?
2.7 s
300
A car travels a circular track with radius 100 m. If it goes around once, what is the displacement of the car?
0
300
A ball is dropped from a 70 m tall tower. How long will it take the ball to hit the ground?
3.78 s
300
The coefficient of kinetic friction between a 25 kg crate and the floor is 0.45. How much force is required to keep the crate moving at a steady speed across the floor?
110.25 N
300
Town A lies 20 km north of town B. Town C lies 13 km west of town A. A small plane flies directly from town B to town C. What is the magnitude of the displacement of the plane?
24 km
300
A cannonball is aimed 30.0° above the horizontal and is fired with an initial speed of 125 m/s at ground level. How far away from the cannon will the cannonball hit the ground?
1380 m
400
An object starts from rest and accelerates uniformly in a straight line . After 11 seconds, its speed is 70.0 m/s. How far does the object travel during the first 11 seconds?
384.78 m
400
A ball is shot straight up from the surface of the earth with an initial speed of 19.6 m/s. How much time elapses between the throwing of the ball and its return to the original launch point?
4 s
400
A 10-kg block is set moving with an initial speed of 6 m/s on a rough horizontal surface. If the force of friction is 20 N, approximately how far does the block travel before it stops?
9 m
400
A force of magnitude 2.0 N and directed due east is exerted on an object. A second force exerted on the object is 2.0 N, due north. What is the magnitude and direction of a third forcewhich must be exerted on the object so that the resultant force is zero?
2.8 N, 45° south of west
400
An arrow is shot horizontally from a height of 4.9 m above the ground. The initial speed of the arrow is 45 m/s. Neglecting friction, how long will it take the arrow to hit the ground?
1.0 s
500
A racecar has a speed of 80 m/s when the driver releases a drag parachute. If the parachute causes a deceleration of 4 m/s2, how far will the car travel before it stops?
800 m
500
Water drips from rest from a leaf that is 20 meters above the ground. Neglecting air resistance, what is the speed of each water drop when it hits the ground?
20 m/s
500
The wheels of a 5000 kg automobile are locked as it slides to a stop from an initial speed of 30.0 m/s. If the coefficient of kinetic friction is 0.200 and the road is horizontal, approximately how long does it take the car to stop?
15.3 s
500
Use the component method of vector addition to find the resultant of the following three vectors: A = 56 km, east B = 11 km, 22° south of east C = 88 km, 44° west of south
68 km, 86° south of east
500
A shell is fired with a horizontal velocity from the top of an 80 m high cliff. The shell strikes the ground 1330 m from the base of the cliff. Determine the initial speed of the shell.
330 m/s
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