Physics Laws of Motion Exercise3a
Please Select
Q1 Explain giving two examples each of:
(a) Contact forces, and (b) non-contact forces
Q2 Classify the following amongst contact and non-contact forces:
(a) Frictional force
(b) Normal reaction force
(c) Force of tension in a string
(d) Gravitational force
(e) Electrostatic force
(f) Magnetic force
Q3 Give on example in each case where:
(a) The force is of contact, and
(b) Force is at a distance.
Q4 (a) A ball is hanging by a string from the ceiling of the roof. Draw a neat labelled diagram showing the forces acting on the ball and the string.
(b) A spring is compressed against a rigid wall. Draw a neat labelled diagram showing the forces acting on the spring.
(c) A wooden block is placed on a table top. Name the forces acting on the block and draw a neat and labelled diagram to show the point of application and direction of these forces.
Q5 State one factor on which the magnitude of a non-contact force depends. How does it depend on the factor stated by you?
Q6 The separation between two masses is reduced to half. How is the magnitude of gravitational force between them affected?
Q7 State the effects of a force applied on (i) a non-rigid, and (ii) a rigid body. How does the effect of the force differ in the two cases?
Q8 Give one example in each of the following cases where a force:
(a) Stops a moving body
(b) Moves a stationary body
(c) Changes the size of a body
(d) Changes the shape of a body
Multiple Choice type Questions :
Q1 Which of the following is a contact force:
(a) Electrostatic force
(b) Gravitational force
(c) Frictional force
(d) Magnetic force
Q2 The non-contact force is:
(a) Force of reaction
(b) Force due to gravity
(c) Tension in string
(d) Force of the friction
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