Exploring Forces — Practice

Question 1

Which of the following is a contact force?

Accepted Answer

Friction

Question 2

The SI unit of weight is

Accepted Answer

newton (N)

Question 3

A coil of wire, a rubbed balloon, a bar magnet and the Earth can each exert a force at a distance. Which of these forces can ONLY attract, never repel?

Accepted Answer

Gravitational force

Question 4

A spring balance has a range of 0 to 6 N, with bigger marks every 1 N and 4 small divisions between consecutive bigger marks. What is the smallest weight it can measure?

Accepted Answer

0.25 N

Question 5

Assertion (A): A ball thrown vertically upwards has a force acting on it even at the topmost point of its path. Reason (R): At the topmost point the ball is momentarily at rest.

Accepted Answer

A is true but R is not the correct explanation of A

Question 6

Two identical wooden blocks are floating, one in water and one in a much denser liquid. Which statement is best supported by the chapter?

Accepted Answer

Each block floats with the buoyant force on it equal to its own weight

Question 7

A ball rolling on flat ground slows down and stops, although nothing visible is touching it apart from the ground. Explain how the chapter concludes that a force must be acting, without ever seeing that force.

Accepted Answer

From the rule that a change of speed never happens without a force.

Question 8

Why does a spring balance carry a scale in grams alongside its scale in newton, and in what situation would the gram scale be wrong while the newton scale stayed right?

Accepted Answer

Because the weight-to-mass ratio is the same for every object on Earth — an assumption that fails off the Earth.

Practice — Exploring Forces

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