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WorksheetsReview of SA1
Total questions: 10
Worksheet time: 12mins
1. Which statements defined forces?
When a force acts on a body that is free to move, the force is the product of the mass of the body and its acceleration.
When a force acts on a body that is free to move, the force is the rate of change of momentum of the body.
When a force acts on a body that is free to move, the force is the work done by the force divided by the distance moved by the body.
When a force acts on a lever and causes a moment, the force is the moment divided by the perpendicular distance of the force from the pivot.
1. Two forces, each of magnitude F, act at points V and W on an object. The two forces form a couple. The shape of the object is a right-angled triangle with sides of lengths x and y, as shown.
Which expression gives the torque by the couple?
Fx
Fy
2Fx
2Fy
The diagram shows four forces applied to a circular object.
Which of the following describes the resultant force and resultant torque on the object?
Resultant force= non zero, resultant torque = non zero
Resultant force= zero, resultant torque = non zero
Resultant force= non zero, resultant torque = zero
Resultant force= zero, resultant torque = zero
A scientist is investigating the properties of a new material. She plots a force-extension graph for the material up to its breaking point.
Which statement must be correct?
The area under the graph from P to R is the strain energy stored in the material.
The area under the graph from P to R is the work done in stretching the material.
The material stretches elastically from Q to R.
The material stretches plastically from P to Q.
The diagram shows the stress-strain graph for two wires X and Y of different materials up to their breaking points. Both wires have the same initial dimensions.
Which statement is not correct?
Material X extends elastically.
Material X extends more than material Y when loaded with the same force.
Material X has a larger ultimate tensile stress.
Material X is brittle.
A rocket is fired upwards.
As it accelerates upwards after leaving the launch pad, which forms of energy are changing?
chemical energy, gravitational potential energy and kinetic energy
chemical energy and gravitational potential energy only
chemical energy and kinetic energy only
gravitational potential energy and kinetic energy only
What is represented by the gradient of a graph of force (vertical axis) against extension (horizontal axis) for a wire obeying Hooke’s law?
elastic limit
spring constant
stress
Young modulus
A long, thin metal wire is suspended from a fixed support and hangs vertically. Masses are suspended from its lower end. The load on the lower end is increased from zero and then decreased again back to zero. The diagram shows the force-extension graph produced.
Where on the graph would the elastic limit be found?
Anywhere between point R and point S
Just beyond point S
Exactly at point S
Exactly at point T
What is a statement of the principle of conservation of momentum?
A force is equal to the rate of change of momentum of the body upon which it acts.
In a perfectly elastic collision, the relative momentum of the bodies before impact is equal to their relative momentum after impact.
The momentum of a body is the product of the mass of the body and its velocity.
The total momentum of a system of interacting bodies remains constant, providing no resultant external force acts on the system.
A ball is thrown vertically in air. Neglecting air resistance, which property of the ball can never be zero at any time during the flight?
acceleration
speed
kinetic energy
velocity
