A spring obeys Hooke’s law.
Which graph is obtained by plotting the extension of the spring against the load applied?
A
An experiment is carried out to measure the extension of a rubber band for different loads. The results are shown at the left.
Which figure is missing from the table?
A 17.2
B 17.3
C 17.4
D 17.6
Four objects are each acted on by only two forces, as shown.
Which object is in equilibrium?
B
C
D
Different weights are hung from a spring. The diagram shows the original length of the spring, and the lengths when different weights are added. The extension of the spring is directly proportional to the weight hung from it.
What is the weight of W?
A 30 N
B 35 N
C 40 N
D 45 N
The extension-load graph for a spring is shown. The unstretched length of the spring is 17.0 cm. When an object is hung from the spring, the length of the spring is 19.2 cm.
What is the weight of the object?
A 1.4 N
B 1.6 N
C 2.6 N
D 3.0 N
Two metal blocks P and Q have identical dimensions. They hang on identical spring balances.
What can be deduced about P and Q?
A They have different volumes and different weights.
B They have different volumes, but equal masses.
C They have equal volumes and equal weights.
D They have equal volumes, but different masses.
A student adds weights to an elastic cord. He measures the length of the cord for each weight. He then plots a graph from the results, as shown.
What has he plotted on the vertical axis?
A measured length
B original length
C (measured length + original length)
D (measured length – original length)
The diagrams show a steel spring and a graph of its length against the load applied to it.
What is the extension of the spring when a load of 20 N is applied to it?
A 3.0 cm
B 4.5 cm
C 5.0 cm
D 8.0 cm
The diagram shows a handle with three forces, each 100 N, applied to it. The handle is free to move.
What is the effect of the forces on the handle?
A The handle will move downwards.
B The handle will not move.
C The handle will turn anticlockwise (to the left).
D The handle will turn clockwise (to the right).
The engine of a car produces a driving force of 5000 N on the car. Resistive forces R also act on the car, as shown. The car has a mass of 800 kg and an acceleration of 1.0 m/s^2.
What is the value of R?
A 800 N
B 4200 N
C 5800 N
D 8000 N
An object moves in a circle at constant speed.
Which statement about the force needed on the object is correct?
A A force away from the centre of the circle keeps the object moving in the circle.
B A force in the direction of motion of the object keeps it moving in the circle.
C A force towards the centre of the circle keeps the object moving in the circle.
D No force is needed to keep the object moving at constant speed in the circle.
A parachutist is falling at terminal velocity, without her parachute open. She now opens her parachute.
What is the direction of her motion, and what is the direction of her acceleration, immediately after she opens her parachute?
A direction of motion of the parachutist = downwards ; direction of acceleration of the parachutist = downwards .
B direction of motion of the parachutist = downwards; direction of acceleration of the parachutist = upwards.
C direction of motion of the parachutist = upwards; direction of acceleration of the parachutist = downwards.
D direction of motion of the parachutist = upwards; direction of acceleration of the parachutist = upwards.
The diagram shows a satellite that is moving at a uniform rate in a circular orbit around the Earth.
Which statement describes the motion of this satellite?
A It is accelerating because its speed is changing.
B It is accelerating because its velocity is changing
C It is not accelerating but its speed is changing.
D It is not accelerating but its velocity is changing.
Which statement about an object moving in a straight line through air is correct?
A When it accelerates, the resultant force acting on it is zero.
B When it moves at a steady speed, the air resistance acting on it is zero.
C When it moves at a steady speed, the resultant force acting on it is zero.
D When it moves, there is a resultant force acting on it.
The diagrams show four identical objects. Each object is acted on by only the three forces shown.
Which object accelerates to the right, with the smallest acceleration?
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