The projectile path taken by an object with air resistance is a shorter horizontal distance to that without air resistance.
The effects of air resistance could be decreased by a projectile with a
Rougher surface
Larger surface to volume ratio
Smaller angle of release
Trajectory at a lower altitude
The graph shows the variation with time of the velocity of a car of fixed mass.
What can be deduced from the graph?
The car is never stationary
The car is always moving backwards
The car is always accelerating
The acceleration of the car is in the opposite direction to its velocity after time t
An object of mass 5.6 g is falling vertically at a constant speed in air.
What is the approximate magnitude of the drag force acting on the object?
0 N
0.056 N
56 N
0.112 N
A stone is released from a hot air balloon moving upwards with a uniform velocity of 25 m s–1.
If the hot air balloon is 30 m high when the stone was dropped, what is its height when the stone hits the ground?
180 m
55 m
150 m
60 m
An object moves through one compete circle from point W to X to Y to Z and finally to W again.
The distance between X and Z is 6 km.
Which row is correct about the displacement and distance of the object?
|
|
Displacement / km |
Distance / km |
|
A. |
0 |
9π |
|
B. |
0 |
6π |
|
C. |
6π |
0 |
|
D. |
6π |
9π |
The graph shows the variation of acceleration a of an object with time t.
Which graph shows how the velocity v of the object varies with t?
A student throws a stone with velocity 3 m s–1 at an angle θ to the vertical from the surface of a lake. Air resistance can be ignored. The acceleration due to gravity is g.
What is the angle θ if the stone hits the surface of the lake 15 m from the student after 10 s?
You may use the fact that sin 30 = 0.5.
90º
45º
60º
30º
A particle moving in a straight line has the displacement–time graph shown.
Which row is correct about the average speed and average velocity of the particle?
|
|
Average speed / m s–1 |
Average velocity / m s–1 |
|
A. |
0 |
4 |
|
B. |
0 |
2 |
|
C. |
4 |
0 |
|
D. |
2 |
16 |
An object is released from rest near the surface of the Earth and allowed to fall freely.
Which of the following correctly describes the speed and acceleration before the object reaches terminal velocity?
| speed | acceleration | |
| A. | remains constant | remains constant |
| B. | remains constant | decreases |
| C. | increases | remains constant |
| D. | increases | decreases |
A ball starts from rest and moves horizontally. Five positions of the ball are shown at time intervals of 0.50 ms. The horizontal distance between X, the initial position, and Y, the final position, is 0.060 m.
What is the average acceleration of the ball between X and Y?
48 m s–2
60 m s–2
19 200 m s–2
30 000 m s–2
