Force
|
F = force
(Newtons) m = mass (kg) a=
acceleration (ms-2)
|
- A car hits a wall and decelerates at 40 ms-2. It exerts a force of 20 000 N on the wall. Calculate the mass of the car?
- A stone of mass 0.5 kg falls into a sandpit exerting
a force of 5N. Calculate its acceleration?
- A car of mass 1000 kg travelling at 10 ms-1
stops in 4 s. Calculate a) the average deceleration. b) the braking force.
- An aeroplane accelerates uniformly from rest (0) to
200 ms-1 in 40 s. Calculate the force it exerted on a pilot
whose mass is 90 kg?
- A bullet of mass 20 g travelling with a velocity of
300 ms-1 hits an earth bank and is brought to rest in 0.2 s Find a) the deceleration of the bullet. b)
the force it exerts on the earth bank.
- A car of mass 750 kg stops uniformly in 5s. If its initial velocity was 15 ms-1.
Calculate the braking force.
- The valve of a cylinder on an engine containing 12 kg
of compressed gas is opened and the cylinder empties in 1min 40 sec. If
the gas leaves its chamber at 25 ms-1.Calculate (a) the
acceleration of the gas. (b) the force exerted on the chamber.
