Check Test 1 - Linear mechanics
1 The slope of a force-acceleration graph has the units of ...
a ... Newton meters.
... kilograms.
2 A change in velocity is given by the integral under ...
... an acceleration-time graph.
3 The formula ...
... can be derived by finding the ...
... area under a velocity-time graph.
4 The equation ....
... applies to ...
... any motion in a straight line for which acceleration is constant.
5 The velocity-time graph for a ball bouncing on a hard level floor is shown below.
Which statement is incorrect?
The velocity and acceleration are both zero at 2.0 seconds when the ball is on the floor.
6 The acceleration of the ball when clear of the floor is measured, from the slopes of the lines on the graph above, (question 5), is 9.65 m/s/s.
The value is less than 9.8 m/s/ because ...
... of air resistance.
7 When a ball rolls freely down a sloping table the acceleration is constant because ....
... All three of the above.
8 When a stone is dropped it accelerates towards the ground because ...
... an unbalanced force due to gravity acts on the stone.
9 The sum of the the three forces shown is ...
... a small force to the right.
10 A car is driven at constant speed on a straight level road.
The correct diagram showing the forces on the car is ...
| a |
c |
d |
11 Which of the following units are equivalent to mass?
N/((m/s)/s)
12 A force versus acceleration graph is shown for a mass oscillating on a vertical rubber band.
The mass of the ball is closest to ...
... 0.2 kg
13 The MKS unit of inertia is the ...
... kilogram.
14 A donkey is attached to a cart. The cart pulls on the donkey and the donkey pulls on the cart.
Action and reaction are equal and opposite.
How is it that the cart and the donkey accelerate down the road?
The donkey pushes horizontally on the road.
15 Friction force versus time graphs are shown for blocks of wood of dragged along a level table.
The mass of the block on the right hand graph is greater than the mass of the block on the left.
The mass of the block shown on the right is is x 2.5 the mass on the left.
16 When measuring friction force between a wooden block and paper covering a table it is better to move the paper than the block because....
... there is no extra force due to the acceleration of the block.
17 A block rests without slipping on an incline.
The diagram that best represents the forces on the block is ...
18 A block is sliding at constant speed down an incline.
The diagram that best represents the forces on the block is ...
19 Which of the following statements is incorrect when a block slides on a level table?
The friction force is proportional to velocity squared.
20 Which of the following statements is correct.
When two asteroids collide ...
... kinetic energy is converted to heat.
21 A mass of 1000 kg falls from a bridge which is 80 meters above a river. When the mass reaches the river 4 seconds after release the velocity is....
... 40 m/s
21 To show that the work done by friction is equal to the kinetic energy lost when a mass slides to rest on a level uniform table you need to....
... know the mass of the block and plot the velocity time graph.
23 Impulse is ...
... the area under a force-time graph.
24 Newton defined force as ...
... the rate of change of momentum.
25 The unit of power is the ...
... Joule per second.
26 Keynes (the economist) is said to have remarked that, "Science progresses from funeral to funeral".
By this he meant that....
... we have to wait for old ones to die before new ideas are accepted.
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