# Motion Analysis Practice Questions

##### 1. A baseball pitcher throws at pitch at 42 m/s. If the batter is 18 meters from the pitcher, approximately how much time does it take the ball to reach the batter?
1. 1.8 seconds
2. 2.0 seconds
3. .87 seconds
4. .43 seconds
##### 2. How much work is done on a downhill skier by an average breaking force of 9.9 x 102 newtons to stop her in a distance of 10 meters?
1. 2.0 x 102 J
2. 3.5 x 10
3. 8.4 x 10
4. 9.8 x 103 J
1. The same
2. Greater
3. Less
1. 20 m/s
2. 25 m/s
3. 30 m/s
4. 35 m/s
##### 5. What is the average velocity of a car that travels due West at 30 kilometers in .5 hr?
1. 60 km/hr west
2. 60 km/hr
3. 15 km/hr west
4. 15 km/hr
##### 6. A man weighs 900 Newtons standing on a scale in a stationary elevator. If some time later the reading on the scale is 1200 Newtons the elevator must be moving with?
1. Constant acceleration downward
2. Constant speed downward
3. Constant acceleration upward
4. Constant speed upward
1. 2 : 3
2. 3 : 4
3. 1 : 2
4. 2 : 1
##### 8. An artillery shell is fired at an angle to the horizontal. Its initial velocity has a vertical component of 150 meters per second and a horizontal component of 260 meters per second. What is the magnitude of the initial velocity of the shell?
1. 2.5 x 102 m/s
2. 3.0 x 102 m/s
3. 3.5 x 103 m/s
4. 3.5 x 104 m/s
##### 9. Into how many possible components can a single force be resolved?
1. An unlimited number
2. Two components
3. Three components
4. Four components at right angles to each other
##### 10. What is the magnitude of the gravitational force between two 5.0 kilogram masses separated by a distance of 5.0 meters?
1. 1.3 x 10-14 N
2. 3.3 x 10-10 N
3. 6.7 x 10-11 N
4. 1.3 x 10-11 N
1. Weight
2. KE
3. Velocity
4. Momentum
##### 12. A .050 kilogram bullet is fired from a 4.0 kilogram rifle that is initially at rest. If the bullet leaves the rifle with momentum having a magnitude of 20 kilograms ? meters per second, the rifle will recoil with a momentum having a magnitude of ___.
1. 1,600 kg ? m/s
2. 80 kg ? m/s
3. 20 kg ? m/s
4. .25 kg ? m/s
##### 13. A wooden block is at rest on a horizontal steel surface. If a 10 N force applied parallel to the surface is required to put the block in motion, how much force is required to keep the block moving at a constant velocity?
1. Less than 10 Newtons
2. Greater than 10 Newtons
3. 10 Newtons
1. 120 W
2. 150 W
3. 180 W
4. 220 W
1. Parabolic
2. Linear
3. Circular
4. Hyperbolic
##### 16. A projectile is launched with an initial velocity of 20 meters per second at an angle of 30 degrees above the horizontal. What is the magnitude of the vertical component of the projectile’s initial velocity?
1. 200 m/s x cos 30°
2. 200 m/s x sin 30°
3. (200 m/s) / (sin 30°)
4. (200 m/s) / (cos 30°)