Measurements & Kinematics
What is the gradient of a displacement–time graph?
Velocity
State Newton’s First Law.
An object remains at rest or uniform motion unless acted on by a resultant force.
State the kinetic energy equation.
KE = ½mv²
State the momentum equation.
p = mv
State Ohm’s Law.
V = IR
What is the area under a velocity–time graph?
Displacement
What equation links force, mass and acceleration?
F = ma
State the gravitational potential energy equation near Earth.
GPE = mgh
What does conservation of momentum mean?
Total momentum before = total momentum after (closed system)
What is the unit of resistance?
Ohm (Ω)
A car accelerates uniformly. What is the shape of its velocity–time graph?
Straight line
What is the weight of a 3 kg object? (g = 9.8 m/s²)
29.4 N
What is power?
Energy transferred per unit time
Define stress.
Force per unit area
State the equation for electrical power.
P = IV
What is the SI unit of acceleration?
m s⁻²
What force keeps an object moving in a circle?
Centripetal force (towards the centre)
A 1000 J appliance works for 5 s. What is its power?
200 W
Define strain.
Change in length ÷ original length
extension ÷ original length
What happens to total resistance in series?
It increases (add them)
An object’s velocity changes from 2 m/s to 10 m/s in 4 s. What is its acceleration?
2.0 m/s²
A 2.0 kg object accelerates at 5.0 m/s². What is the resultant force?
10 N
A machine has 800 J input and 600 J useful output. What is its efficiency?
75%
What is the gradient of a stress–strain graph in the elastic region?
Young modulus
Two 6.0 Ω resistors are connected in parallel. What is the total resistance?
3.0 Ω