Physics Kinematics Level: High School
If you exert a force F on an object , the force which the object exerts on you will Depend on whether or not you are moving.Be –F in all cases.
Depend on whether or not the object is moving.
Depend on the relative masses of you and the object.
Physics Kinematics Level: High School
If a force accelerates 4.5 kg at 40 m/s^2 , that same force would accelerate 18 kg by how much ?10 m/s^2
0.16 km/s^2
40 m/s^2
32 ft/s^2
0.18 km/s^2
Physics Kinematics Level: High School
A team of dogs pulls on a sled that has a mass of 150 kg with a net horizontal force of 300 N . Assuming that there is no friction , What is the acceleration of the sled ?2.00 m/s^2
0.500 kg-m
0.500 m/s^2
2.00 N-m
Physics Kinematics Level: High School
A load of steel of mass 6000 kg rests on the flatbed of a tuck . It is held in place by metal brackets and can exert a maximum horizontal force of 8000 N. When the truck is traveling 20 m/s . What is the minimum stopping distance if the load is not to slide forward into the cab ?156 m
150 m
Physics Kinematics Level: High School
Explain how a positive acceleration could produce a deceleration .An object which was moving in the negative direction would slow down , if its acceleration were positive (a negative acceleration would mean the velocity was getting more negative ).
An object which was moving in the positive direction would slow down if its acceleration were negative (a negative acceleration would mean the velocity was getting more negative .)
Physics Kinematics Level: High School
A ball is released moving straing up at 15 m/s . A short time late it is falling downward at 15 m/s . What was the magnitude of its average speed over the time period ?30 m/s
15 m/s
0 m/s
7.5 m/s
Average speed = (u+v)/2 (We are considering the magnitude.)
Physics Kinematics Level: High School
Can an object have increasing speed while its acceleration is decreasing ?a) Yes , any non-zero acceleration in the same as the motion of the object will be increasing its speed .
b) No , because if acceleration is decreasing the object will be slowing down
c) No , this is impossible because of the way in which acceleration is defined .
d) Yes , and an example would be an object falling in the absence of air friction .
Physics Kinematics Level: High School
Barbara travels 20 km Northward , then travels 40 km Eastward, then continues for 50 km in a Southward direction. What displacement will now take her back to her initial position ?50 km Northwest.
30 km Westward + 40 km Northward
30 km Eastward + 40 km Southward
40 km Eastward + 30 km Southward
40 km Westward + 30 km Northward
30 km Northward + 30 km Westward
(Displacement is the shortest path , so it will be a single distance )
Physics Kinematics Level: High School
A ball is thrown straight up with a speed of 36 m/s . How long does it take to return to its starting point ?7.3 s
5.3 s
Physics Kinematics Level: High School
A car starts from rest and accelerates to a speed of 72 km/h in 5 seconds . Assuming uniform acceleration . What is the acceleration in meters per second squared ?0.1 m/s^2
360 m/s^2
14.4 m/s^2
4 m/s^2
Physics Kinematics Level: High School
An arrow starting from rest , leaves the bow with a speed of 15.0 m/s . If the average force exerted on the arrow by the bow were doubled . all else remaining the same , with what speed would the arrow leave the bow ?
Physics Kinematics Level: High School
In stunts for a new movie . In one scene the writers want a car to jump across the chasm between two cliffs . The car driving along a horizontal road when it goes over one cliff . The car is to travel through the air from one cliff to another , lower cliff . The higher cliff is 900 meters above the bottom of the chasm . The movie makers want to know the minimum difference in height between the upper road and lower road . So that the car does not fall into the chasm . They have not select a location so they want an expression for the difference in height between the upper road the lower road , h , in terms of the car’s mass , m , the width of the chasm , w , and the maximum road speed of the car , v (the maximum speed with which it can leave the upper cliff). The stunt director will plug in the actual numbers after the location is selected .
Physics Kinematics Level: High School
For an object to orbit the Earth , it must travel far enough horizontally such that if falls vertically at the same rates that the Earth’s surface is curving away from its horizontal path , about 5 meters vertically for each 8000 meters traveled horizontally . What would be the corresponding speed in kilometers per hour ?
Physics Kinematics Level: High School
If the velocity of a body increases , we may be sure that during the period of this increase :a. The distance of the body from the origin decreases.
b. The distance of the body from the origin increases.
c. The acceleration of the body increases .
d. The acceleration of the body remains constant .
e. The body accelerates .
Physics Kinematics Level: High School
An artillery shell has been launched at a 45 degree angle. If air friction is neglected , the maximum acceleration occurs :a. Just after leaving the gun .
b. At the shell’s maximum height .
c. Just before hitting the ground .
d. Acceleration is constant through out its flight .
e. At 0.707 of the shell’s maximum height .