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The tendency of an object to remain at rest or to continue in its uniform motion in a straight line is known as .. - NSC Physical Sciences - Question 1 - 2016 - Paper 1
Question 1
The tendency of an object to remain at rest or to continue in its uniform motion in a straight line is known as ... A inertia. B acceleration. C Newton's Third... show full transcript
Worked Solution & Example Answer:The tendency of an object to remain at rest or to continue in its uniform motion in a straight line is known as .. - NSC Physical Sciences - Question 1 - 2016 - Paper 1
Step 1
The tendency of an object to remain at rest or to continue in its uniform motion in a straight line is known as ...
Answer
The concept referred to in this question is known as inertia. Inertia is the property of matter that causes it to resist any change in its state of motion, whether that state is rest or uniform velocity.
Step 2
Step 3
An object is thrown vertically upwards from the ground. Which ONE of the following is CORRECT regarding the direction of the acceleration of the object as it moves upwards and then downwards?
Answer
The acceleration due to gravity acts downwards throughout the entire motion of the object, so it is downward when the object is moving upward and also when it is moving downward.
Step 4
A person drops a glass bottle onto a concrete floor from a certain height and the bottle breaks. The person then drops a second, identical glass bottle from the same height onto a thick, woolen carpet, and the bottle does not break. Which ONE of the following is CORRECT for the second bottle compared to the first bottle for the same momentum change?
Answer
The impact force experienced by the second bottle, which lands on the carpet, is smaller due to the cushioning effect of the carpet, resulting in a longer time of contact. Hence, the average force on the second bottle is smaller.
Step 5
A block of mass m is released from rest from the top of a frictionless inclined plane QR, as shown below. The total mechanical energy of the block at point Q and point R is E_Q and E_R, respectively. The kinetic energy of the block at points Q and R is K_Q and K_R, respectively. Which ONE of the statements regarding the total mechanical energy and the kinetic energy of the block at points Q and R respectively is CORRECT?
Answer
The total mechanical energy of the block remains constant throughout its motion if we assume no energy losses due to friction or air resistance. Hence, E_Q = E_R. Consequently, as the block descends, its kinetic energy increases, indicating K_R > K_Q.
Step 6
The diagram below shows the positions of two stationary listeners, P and Q, relative to a car moving at a constant velocity towards itself or away from the car. Which ONE of the following correctly describes the frequency of the sound heard by P and Q, compared to that heard by the driver?
Answer
Due to the Doppler effect, the listener P, who is moving towards the sound source, will hear a higher frequency than the driver, while the listener Q, who is moving away, will hear a lower frequency.
Step 7
Two charges, +Q and -Q, are placed a distance d from a negative charge -q. The charges, +Q and -Q, are located along lines that are perpendicular to each other as shown in the diagram. Which ONE of the following correctly shows the direction of the net force acting on charge -q due to the presence of charges +Q and -Q?
Answer
The net force on charge -q will be directed towards charge +Q due to the attractive nature of the forces between opposite charges, while the force due to charge -Q will repel -q and thus point away from it.
Step 8
Learners investigate the relationship between current (I) and potential difference (V) at a constant temperature for three different resistors, X, Y and Z. They obtain the graphs shown below. The resistances of X, Y and Z are R_X, R_Y and R_Z respectively. Which ONE of the following conclusions regarding the resistances of the resistors is CORRECT?
Answer
The slopes of the I-V graphs provide information about the resistances. The steeper the slope, the lower the resistance. Therefore, resistor X has the highest resistance, Y has a medium resistance, and Z has the least resistance.
Step 9
Which ONE of the following changes may lead to an increase in the emf of an AC generator without changing its frequency?
Answer
To increase the emf without altering frequency, the increase in the area of the coil can be utilized, which will generate more emf due to the Faraday's law of electromagnetic induction.
Step 10
The wavelength of a monochromatic light source P is twice that of a monochromatic light source Q. The energy of a photon from source P will be ... of that from source Q.
Answer
The energy of a photon is inversely proportional to its wavelength. Therefore, if source P has a wavelength twice that of Q, the energy of the photon from P will be a quarter of that from source Q.