2020年10月IB物理(SL)真题PDF下载-paper1
1.Which quantity has the same units as those for energy stored per unit volume?
A.Density
B.Force
C.Momentum
D.Pressure
2.A list of four physical quantities is
• acceleration
• energy
• mass
• temperature
How many scalar quantities are in this list?
A.1
B.2
C.3
D.4
3.An object of mass 2m moving at velocity 3v collides with a stationary object of mass 4m. The objects stick together after the collision. What is the final speed and the change in total kinetic energy immediately after the collision?
4. An object of mass 1 kg is thrown downwards from a height of 20 m. The initial speed of the object is 6 m s–1.
The object hits the ground at a speed of 20 m s–1. Assume g = 10 m s–2. What is the best estimate of the energy transferred from the object to the air as it falls?
A. 6 J
B. 18 J
C. 182 J
D. 200 J
5. An object of mass 8.0 kg is falling vertically through the air. The drag force acting on the object is 60 N. What is the best estimate of the acceleration of the object?
A. Zero
B. 2.5 m s–2
C. 7.5 m s–2
D. 10 m s–2
6.P and Q leave the same point, travelling in the same direction. The graphs show the variation with time t of velocity v for both P and Q.
What is the distance between P and Q when t = 8.0 s?
A.20 m
B.40 m
C.60 m
D.120 m
7. Three forces act on a block which is sliding down a slope at constant speed. W is the weight, R is the reaction force at the surface of the block and F is the friction force acting on the block.
In this situation
A. there must be an unbalanced force down the plane.
B. W = R.
C. F = W.
D. the resultant force on the block is zero.
8. A balloon rises at a steady vertical velocity of 10 m s–1. An object is dropped from the balloon at a height of 40 m above the ground. Air resistance is negligible. What is the time taken for the object to hit the ground?
A. 10 s
B. 5 s
C. 4 s
D. 2 s
9. An object of mass m strikes a vertical wall horizontally at speed U. The object rebounds from the wall horizontally at speed V.
What is the magnitude of the change in the momentum of the object?
A. 0
B. m(V-U)
C. m(U-V)
D. m(U+V)
10.A horizontal force F acts on a sphere. A horizontal resistive force kv 2 acts on the sphere where v is the speed of the sphere and k is a constant. What is the terminal velocity of the sphere?
A.√k/F
B.k/F
C.F/k
D.√F/k
2020年10月IB物理(SL)真题余下省略！
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