P5 Science · Chapter 14brightbit.net/worksheets
Forces
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
What is a force?
(a) The speed of a moving object(b) A push or a pull that can change an object's shape, speed, or direction(c) The weight of an object(d) The energy stored in an object
- 2.
What is the difference between a contact force and a non-contact force?
(a) Contact forces are stronger; non-contact forces are weaker(b) Contact forces require physical contact; non-contact forces act at a distance(c) Non-contact forces need contact; contact forces act from a distance(d) They are the same thing
- 3.
What is gravity?
(a) A contact force between surfaces(b) A non-contact force of attraction between masses(c) The weight of an object(d) A force that only acts on large objects
- 4.
- 5.
State ONE situation where friction is useful and ONE where it is a problem.
- 6.
What is air resistance (drag)?
(a) The force of gravity on a moving object(b) A friction-like force between a moving object and the air around it(c) The upward force on a floating object(d) The force that makes air flow
- 7.
A ball is dropped from a height. It accelerates, then reaches a constant speed (terminal velocity). Explain why.
- 8.
What is upthrust?
(a) The downward force of gravity on a submerged object(b) An upward force exerted by a fluid on an object in it(c) The force that causes objects to sink(d) The weight of water displaced
- 9.
Why does a ship made of steel float even though steel is denser than water?
- 10.
What is elastic force (spring force)?
(a) The force of gravity on a stretched object(b) The restoring force in a stretched or compressed elastic material(c) Friction between elastic surfaces(d) The force needed to stretch a non-elastic material
Answer key — P5 Science: Forces
For parents. Step-by-step explanations for every question are free on brightbit.net.
- 1.(b) A push or a pull that can change an object's shape, speed, or direction
- 2.(b) Contact forces require physical contact; non-contact forces act at a distance
- 3.(b) A non-contact force of attraction between masses
- 4.Friction is a contact force that opposes the motion between two surfaces in contact; it acts in the opposite direction to movement
- 5.Useful: brakes stopping a bicycle / walking without slipping; Problem: engine parts wearing out / slowing down a moving vehicle
- 6.(b) A friction-like force between a moving object and the air around it
- 7.Initially gravity > air resistance, so the ball accelerates. As speed increases, air resistance increases until it equals gravity; the forces are balanced and speed becomes constant (terminal velocity)
- 8.(b) An upward force exerted by a fluid on an object in it
- 9.The ship's hull is hollow, so the average density of the ship (steel + large air space) is less than water; upthrust equals the ship's weight
- 10.(b) The restoring force in a stretched or compressed elastic material
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