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Science Test 11/20
Question | Answer |
---|---|
Forces pulling all objects towards each other: | Gravity |
How many forces are required for an interaction? | 2 |
_______ force is the upward force that acts on submerged object. | Buoyant |
The bouncy ball hits the ground with 5 N of forces and the ground pushes back with: | 5 N |
Which law is demonstrated in the bouncy ball example? | Newton's Third Law |
If something has a larger density than water will it float or sink? | Sink |
What is the density of water? | 1 g/mL |
The sum of all of the forces acting on an object is the _____ force | Net |
The gravitational pull on an object is called: | Weight |
What is the force that opposes the sliding of two surfaces touching each other? | Friction |
What makes an object have more inertia? | More mass |
What is the tendency to resist change in motion? | Inertia |
Newton's First Law: | An object in motion tends to stay in motion unless acted on by an external force |
Newton's Second Law: | F = MA |
Newton's Third Law: | For every action there is an equal and opposite reaction |
Three ways you can change an objects acceleration: | Speed up, slow down, or change direction |
Why does an object feel "lighter" underwater? | It feels lighter because Archemedes's principle states that the force pushing on an object under water, is equal to the mass of the water it has pushed out of the way. |
Why would a cannon ball and cannon have different accelerations? | Second law. Same forces and different masses. |
If you push a car by hand and the car pushes back with the same force do they cancel out? | No because they are pushing on different objects |
Why can a boxxer not hit a bag and a newsopaper with the same force? | They have different masses. |