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What is Newton's first law of motion?

Newton's first law of motion states 'an object will only experience acceleration if a resultant force is acting on it'. This means that only unbalanced forces will cause a change in the speed of the object. ...
DL
Answered by Daniel L. • Physics tutor
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a car travels at a constant speed of 60 km/h. How far will it be after 3 h?

distance = velocity*time= 180 km
EM
Answered by Edmondo M. • Physics tutor
8112 Views

Describe the basic principles of ultrasound imaging (2 marks)

Ultrasound is any frequency above that of human hearing - around 20 kilohertz . Ultrasound imaging works by emitting a known intensity of ultrasound at a specific frequency, and capturing the reflected sound...
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Answered by Alex G. • Physics tutor
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Describe how the velocity and forces acting on a skydiver change during their fall (6 marks)

Different exam boards may want a different format of answer, so before beginning this question, it would be worth thinking how other six mark questions are marked in other papers. Edexcel want the student to...
JR
Answered by Jethro R. • Physics tutor
15683 Views

How does a hydraulic jack work and how do I work out the pressures involved?

(Draw hydraulic jack diagram using Pen tool) Firstly, we need the quation for pressure. Pressure is measured in Nm^2 which tells us that P=F/A. Where P is the pressure, F is the force in Newtons and A is the...
MZ
Answered by Max Z. • Physics tutor
6697 Views