The circuit is used to work a robotic arm that moves parcels in a warehouse.The arm picks up a parcel with a mass of $5 \mathrm{kg}$ moves to $2 \mathrm{m}$ to the left and puts it down $0.75 \mathrm{m}$ higher than it started. Lifting a heavy object can be done with a lever.Explain how a lever might be used to change the force required to lift the parcel.

To test an electric motor,a student devises the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and timing it takes for the mass to be lifted $1 \mathrm{m}$.

Why is it important to keep the distance that the mass is lifted the same each time?

To test an electric motor,a student devises the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and timing how long it takes for the mass to be lifted $1 \mathrm{m}$.

Suggest another experimental factor that should be kept constant throughout the experiment.

To test an electric motor,a student devised the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and recording the time it takes for the mass to be lifted $1 \mathrm{m}$.

When the motor is loaded with a mass of $100 \mathrm{g}$motor lifts it in $11 \mathrm{s}$ , $200 \mathrm{g}$ takes $12.4 \mathrm{s}$ , $300 \mathrm{g}$ takes $14.2 \mathrm{s}$ ,$400 \mathrm{g}$ takes $16.4 \mathrm{s}$ and $500 \mathrm{g}$ takes $19.6 s$. Put these results in a suitable table.

To test an electric motor, a student devised the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and recording the time it takes for the mass to be lifted $1 \mathrm{m}$.

When the motor is loaded with a mass of $100 \mathrm{g}$,motor lifts it in $11 \mathrm{s}$ , $200 \mathrm{g}$ takes $12.4 \mathrm{s}$ ,$300 \mathrm{g}$ takes $14.2 \mathrm{s}$ ,$400 \mathrm{g}$ takes $16.4 \mathrm{s}$ and $500 \mathrm{g}$ takes $19.6 s$. Plot this data and add a line of best fit.

To test an electric motor,a student devises the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and timing it takes for the mass to be lifted $1 \mathrm{m}$.

Calculate the weight of $500 \mathrm{g}$ mass (in Newton).

To test an electric motor,a student devises the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and timing it takes for the mass to be lifted $1 \mathrm{m}$.

The weight of the $500 \mathrm{g}$ mass is caused by the gravitational pull of the earth.According to newtons third law , there must be an equally sized force acting in the opposite direction. Describe what this force is and which objects the force acts on.

To test an electric motor,a student devises the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and timing it takes for the mass to be lifted $1 \mathrm{m}$.

When the motor is loaded with a mass of $100 \mathrm{g}$, motor lifts it in $11 \mathrm{s}$ , $200 \mathrm{g}$ takes $12.4 \mathrm{s}$ ,$300 \mathrm{g}$ takes $14.2 \mathrm{s}$ ,$400 \mathrm{g}$ takes $16.4 \mathrm{s}$ and $500 \mathrm{g}$ takes $19.6 s$. When the motor is switched is on $500 \mathrm{g}$ accelerates upwards. The acceleration lasts for $0.1 \mathrm{s}$. Use the experimental data to show, the speed was about $0.05 \mathrm{m} {\mathrm{s}}^{-1}$. Assume that the distance travelled while the mass is accelerating is negligible.

To test an electric motor,a student devises the apparatus shown in the diagram :

The student proposes changing the mass that the motor tries to lift and noting the time it takes for the mass to be lifted $1 \mathrm{m}$.

When the motor is loaded with a mass of $100 \mathrm{g}$, motor lifts it in $11 \mathrm{s}$ , $200 \mathrm{g}$ takes $12.4 \mathrm{s}$ ,$300 \mathrm{g}$ takes $14.2 \mathrm{s}$ ,$400 \mathrm{g}$ takes $16.4 \mathrm{s}$ and $500 \mathrm{g}$ takes $19.6 s$. When the motor is switched is on $500 \mathrm{g}$ accelerates upwards with the speed about $0.05 \mathrm{m} {\mathrm{s}}^{-1}$. The acceleration lasts for $0.1 \mathrm{s}$. Calculate the acceleration of the mass( in $\mathrm{m} {\mathrm{s}}^{-2}$)