Photo AI
A bucket is at rest on a table - NSC Physical Sciences - Question 1 - 2022 - Paper 1
Question 1
A bucket is at rest on a table. Which ONE of the following is the reaction force to the weight of the bucket, as described by Newton's Third Law? A) Force of the t... show full transcript
Worked Solution & Example Answer:A bucket is at rest on a table - NSC Physical Sciences - Question 1 - 2022 - Paper 1
Step 1
Which ONE of the following is the reaction force to the weight of the bucket, as described by Newton's Third Law?
Answer
According to Newton's Third Law, every action has an equal and opposite reaction. Therefore, the reaction force to the weight of the bucket (which acts downwards) is the force exerted by the table on the bucket. Thus, the correct answer is D) Force of the table on the bucket.
Step 2
Which ONE of the following expresses the momentum with which the ball NOW strikes the floor?
Answer
When the ball is dropped from height h, it strikes the ground with momentum p. When dropped from height 2h, it will strike the ground with greater momentum. Since momentum p is proportional to the square root of height (i.e., and ), the new momentum can be expressed as , showing that the correct answer is D) 2p.
Step 3
Which ONE of the following can be used to describe force F?
Answer
The work done by force F is the same regardless of the path taken. For both paths, force F is responsible for moving the object. In this context, either the normal force, tension force, frictional force, or gravitational force can be applicable. However, the best descriptor for general work done in these situations, independent of path, is the D) Gravitational force.
Step 4
Step 5
Which ONE of the combinations below shows the CORRECT new peak output voltage and the time for ONE rotation (s)?
Answer
When the speed of the generator's coil is doubled, the peak output voltage also effectively doubles. Therefore, if the original peak voltage was 200 V, the new peak voltage would be 400 V. Additionally, the time for one rotation will be halved. Hence, if the original time was 0.04 s, the new time will be 0.02 s. Thus, the correct combination is A) 400, 0.02.