1 -A body of mass 1 kg has weight 10 N at a certain place.
What is the weight of
a 100 g,
b 5 kg,
c 50 g?
2 -The force of gravity on the Moon is said to be one-sixth of
that on the Earth. What would a mass of 12 kg weigh
a on the Earth, and
b on the Moon?
3 -What is the force constant of a spring which is stretched
a 2 mm by a force of 4 N,
b 4 cm by a mass of 200 g?
4 – 3 a What resultant force produces an acceleration of 5 m/s2
in a car of mass 1000 kg?
b What acceleration is produced in a mass of 2 kg by a
resultant force of 30 N?
5- A block of mass 500 g is pulled from rest on a horizontal
frictionless bench by a steady force F and travels 8 m in 2 s.
Find
a the acceleration,
b the value of F.
6 -Starting from rest on a level road a girl can reach a speed of
5 m/s in 10 s on her bicycle. Find
a the acceleration,
b the average speed during the 10 s,
c the distance she travels in 10 s.
Eventually, even though she is still pedalling as fast as
she can, she stops accelerating and her speed reaches a
maximum value. Explain in terms of the forces acting why
this happens.
7 -What does an astronaut of mass 100 kg weigh
a on Earth where the gravitational fi eld strength is
10 N/kg,
b on the Moon where the gravitational fi eld strength is
1.6 N/kg?
