Physical Science This test covers what you learned in Unit 1 including: ◦ Contact and Non-Contact...
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Transcript of Physical Science This test covers what you learned in Unit 1 including: ◦ Contact and Non-Contact...
This test covers what you learned in Unit 1 including:◦ Contact and Non-Contact Forces◦ How to measure motion (speed and velocity)◦ Balanced and unbalanced forces◦ Newton’s Laws of Motion
Quiz yourself by going through the slides. To check your answer or get to the next question, click on the balloon car. Good Luck!
Overview
The tendency for an object to stay in motion or to stay at rest is called?a. accelerationb. frictionc. inertia
Pushes and pulls that result from direct touching of objects are called?a. contact forcesb. non-contact forces
What is the formula for speed and what do you call speed in a certain direction?
a. Time ÷ distance / velocityb. Distance ÷ time / newtonsc. Distance ÷ time / velocity
Friction caused by molecules in the air is called?a. sliding frictionb. rolling frictionc. air resistance
A force that resists movement of one surface past another surface is called?
a. gravityb. frictionc. magnetism
The greater the mass, the greater the force needed to accelerate the object. This is Newton’s a. First Lawb. Second Lawc. Third Law
An object in motion stays in motion, an object at rest stays at rest unless acted upon by an outside force. This is Newton’sa. First Lawb. Second Lawc. Third Law
For every action, there is an opposite and equal reaction. This is Newton’s a. First Lawb. Second Lawc. Third Law
FrictionThree types of friction are sliding, rolling, and fluid. Important uses of friction:
a. Walking – you couldn’t walk without friction between your shoes and the ground.
b. Writing – you couldn’t hold a pencil without friction.
c. Driving a car – you couldn’t move without friction between the tires and the road.
Problems from friction:
a. Makes movement difficult.
b. Wastes energy – in a vehicle - excess friction means extra fuel is needed.
c. Wears things out – machines with moving parts can wear out due to friction. Lubrication such as oil can reduce friction.