The subsequent path taken by the mass is a
line along a radius of the circle.
curve in a horizontal plane.
curve in a vertical plane.
It is greatest when the object is at the bottom of the circle.
It is greatest when the object is halfway up the circle.
It is greatest when the object is at the top of the circle.
It is unchanged throughout the motion.
The resultant force acting on the mass is
directed upwards along the string.
directed towards the centre of the circular path.
in the same direction as the velocity of the mass.
`v^2/r` towards the centre of the circle
`v^2/r` away from the centre of the circle
`v^2/r` along a tangent to the circle
The Earth and the Sun both have a very large radius.
The distance between the Earth and the Sun is approximately constant.
The Earth and the Sun both have a very large mass.
The Earth and the Sun behave as point masses.
`1/4` of that on Earth. The mass of Earth is approximately ten times that of Mars.
the forward force from the engine.
the sideways friction between the tires and the track.
the weight of the car.
An identical mass is placed at point Y as shown below.
The resultant gravitational field strength at P is now
greater than 2g.
between 2g and g.
between g and zero.
is equivalent to Newton’s second law of motion.
explains the origin of gravitation.
is used to make predictions.
is not valid in a vacuum.
directly proportional to the particle mass.
directly proportional to the particle speed.
directly proportional to the (particle speed)2.
What is the tension in the string when the object is at the bottom of the circle?
m(ω2r + g)
m(ω2r – g)
mg(ω2r + 1)
mg(ω2r – 1)
5.4 km s–1. After a time of 600 s, the speed is 5.1 km s-1. The average gravitational field strength acting on the spacecraft during this time interval is
5.0×10–4 N kg–1
3.0×10–2 N kg–1
5.0×10–1 N kg–1
30 N kg–1
Force acting per unit mass on a small mass placed at the point.
Work done per unit mass on any mass moved to the point.
Force acting on a small mass placed at the point.
Work done on any mass moved to the point.
10 N kg–1.
2.5 N kg–1
5.0 N kg–1
10 N kg–1
20 N kg–1
Which diagram correctly shows the direction of the velocity v and acceleration a of the particle P in the position shown?
The mass per unit weight
The weight of a small test mass
The force acting on a small test mass
The force per unit mass acting on a small test mass
Point X is a distance 2L from the centre of the disc. Point Y is a distance L from the centre of the disc. Point Y has a linear speed v and a centripetal acceleration a.
What is the linear speed and centripetal acceleration of point X?
ME, its radius is RE and the magnitude of the gravitational field strength at the surface of Earth is g. The universal gravitational constant is G. The ratio `g/G` is equal to
equal to the gravitational force on the satellite.
equal to the vector sum of the gravitational force on the satellite and the centripetal force.
equal to the force exerted by the satellite’s rockets.
At the lowest point of the motion, the magnitude of the tension in the string is
less than the weight of the mass of the pendulum bob.
greater than the weight of the mass of the pendulum bob.
equal to the weight of the mass of the pendulum bob.
What is a possible pulse shape when the pulses overlap?
How do the tension in the string and the kinetic energy of the mass compare at P and Q?
Which of the following identifies the units for the quantities a, b and c for a gravitational field?
The force exerted by the rod on the mass is
constant in magnitude.
always directed towards the centre.
a minimum at the top of the circular path.
The turntable rotates uniformly about a vertical axis. The magnitude of the linear velocity of X is v and the magnitude of its acceleration is a. Which of the following correctly compares the magnitude of the velocity of Y and the magnitude of the acceleration of Y with v and a respectively?