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P2 Topic 3
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An object will accelerate when
A. The forces acting on it are balanced.
B. The forces acting on it are unbalanced.
C. Air resistance is equal to the object's weight
D. Its weight is equal to the reaction from the ground.
Jane compares the performance of some racing cars. She finds this information on the internet. Jane discovers that a racing car accelerates from 0 to 30 mph in 1.2 s. The speed of the car after 1.2 s from the start is about
A. 13 m/s
B. 16 m/s
C. 37 m/s
D. 67 m/s
A car is moving in a straight line. The graph shows the stopping of this car in an emergency. The resultant force on the car during the first second is
A. 0N
B. 50/2N
C. 50/1.5N
D. 50N
The acceleration of the car in the previous question whilst braking is
A. -0.1 m/s2
B. -9 m/s2
C. -10 m/s2
D. -12.5 m/s2
On these graphs, the solid line shows the graph on page 12. Which graph shows what would happen if the car suddenly hit a small patch of oil on the road, just as the driver started to brake.
A.
B.
C.
D.
The diagram shows some forces acting on a car. The resultant of these forces is
A. 2000 N to the right.
B. 3500 N to the right.
C. 5500 N to the right.
D. 7500 N to the right.
The graph shows how the speeds of four identical cars change with time. Which line is for the car with the largest kinetic energy at time t?
A.
B.
C.
D.
A car accelerates at 2 m/s2. The mass of the car is 1000 kg. The force producing this acceleration is
A. (2 / 1000) N
B. (2 + 1000) N
C. (1000 - 2) N
D. (1000 x 2) N
The diagram shows how the velocity of a falling object changes with time. At which point A, B, C or D is the resultant force on the object zero?
A.
B.
C.
D.
At which point A, B, C or D on the previous graph is the acceleration largest?
A.
B.
C.
D.
The mass of the engine is 100 000 kg and of each coach is 25 000 kg. When the train travels at constant speed, the engine still has to exert a force on coach Y. This is because
A. The coach has a large mass.
B. The steam carries away thermal energy.
C. There are frictional forces.
D. Gravity always acts at right angles to the trains movement
As the engine in the previous question travels at a constant speed, it pulls on Y with a force of 10 000 N. Coach Y pulls on the engine with a force of
A. Zero
B. 9 950 N
C. 10 000 N
D. 10 050 N
As the train sets off, the resultant force on coach Y is 10 000 N. The acceleration produced by this force is
A. 0.067 m/sē
B. 0.4 m/sē
C. 2.5 m/sē
D. 15 m/sē
The photograph shows a miniature train running on a level track. The engine driver applies the brakes on the engine. Which diagram shows the horizontal forces acting on the first coach?
A.
B.
C.
D.