BGE – Forces HW
Name:
Parents Signature:
1. What is the name of the device used to measure a force?
(1)
2. What are the three characteristics of an object which can be changed if the
object experiences a force?
3. What is the difference between the mass and weight of an object?
(2)
(2)
4. a) Calculate the weight of a boy who has a mass of 40kg on Earth? ( g = 9.8 Nkg-1 ) (3)
b) How does the mass of the boy compare on Earth to his mass in space?
(1)
5. A pupil makes the following statement in a Physics class:
“I think you don’t weigh as much in space as you do on Earth….”
Is the pupil correct? You must explain your answer.
(2)
6. The following diagram shows the horizontal forces acting on a block:
5N
5N
a) State the two possible motions of the block if the forces are balanced
as shown above.
(2)
b) If two objects come into contact with each other a friction force will exist
between them. In which direction does friction always act?
c) Friction causes energy to be lost to the surroundings in which form?
(1)
(1)
7. In order to land safely, skydivers must deploy a parachute:
a) Draw a free object diagram identifying the vertical forces acting on the skydiver
after the parachute has been deployed.
(2)
b) What happens to the speed of a skydiver after the parachute has been deployed?
You must answer must mention the forces acting on the skydiver.
(2)
c) A few seconds after the skydiver deploys his parachute, he reaches terminal velocity.
Describe the motion of the skydiver after reaching terminal velocity.
(1)
Total Marks = 20