# Eighth Grade (Grade 8) Physics Questions

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Grade 8 :: Forces and Motion by ncarlson0923
Grade 8 :: Forces and Motion by ncarlson0923
When is the velocity of an object constant?
1. when only its speed changes
2. when only its direction changes
3. when its speed and its direction both change
4. when neither its speed nor its direction change
Grade 8 :: Forces and Motion by ncarlson0923
Why is Newton's first law sometimes called the law of inertia?
1. because inertia is the tendency of objects to resist changes to their motion
2. because inertia describes the application of force to an object at rest
3. because inertia describes the applications of force to an object in motion
4. because inertia is the same thing as friction
Grade 8 :: Forces and Motion by ncarlson0923
What features determine an object's acceleration?
1. the forces acting on it and its size
2. the forces acting on it and its mass
3. the forces acting on it only
4. its weight and its mass
Grade 8 :: Forces and Motion by ncarlson0923
How often does the tip of an hour hand on a clock have the same velocity?
1. once every minute
2. once every hour
3. once every 12 hours
4. once every 24 hours
Grade 8 :: Forces and Motion by ncarlson0923
If you use two difference reference points to describe the position of the same item, how will your descriptions differ?
1. They will always differ in distance.
2. They will always differ in direction.
3. They will differ in either distance or direction or both.
4. They will differ in either distance or direction but not both.
Grade 8 :: Forces and Motion by wlemerson
A force is a
1. constant speed
2. push or pull
3. linear quantity
4. cannot be determined
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
The formula for acceleration.
1. $A=(V_F-V_I)/(T_F-T_I)$
2. $F=M*A$
3. $V=d/t$
4. $A=(DeltaT)/(DeltaV)$
Grade 8 :: Forces and Motion by wlemerson
A bicycle rider decreases his speed from 15 m/s to 5 m/s in 10 seconds. What is his rate of acceleration?
1. 1 m/s
2. $15 m/s^2$
3. $-5 m/s^2$
4. $-1 m/s^2$
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
The formula for velocity.
1. $A=(ΔV)/(Δt)$
2. $V=d/t$
3. $F=M*A$
4. $N=1 Kg*1m/s^2$
Grade 8 :: Forces and Motion by wlemerson
Grade 8 :: Forces and Motion by wlemerson
The rate at which velocity changes over time.
1. speed
2. acceleration
3. Newton
4. force
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